[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: channel
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_13755 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/13755
 * Buggy version: 7acb881bbb8f23e87b69fce9568d9a3316b5259c
 * fix commit-id: ef906076adc1d0e3721944829cfedfed51810088
 * Flaky: 100/100
 * Description: The buggy code does not close the db query result (rows),
 * so that one goroutine running (*Rows).awaitDone is blocked forever.
 * The blocking goroutine is waiting for cancel signal from context.
 */

package main

import (
	"os"
	"runtime/trace"
	"context"
	)

type Rows struct {
	cancel context.CancelFunc
}

func (rs *Rows) initContextClose(ctx context.Context) {
	ctx, rs.cancel = context.WithCancel(ctx)
	go rs.awaitDone(ctx)
}

func (rs *Rows) awaitDone(ctx context.Context) {
	<-ctx.Done()
	rs.close(ctx.Err())
}

func (rs *Rows) close(err error) {
	// rs.cancel()
}

/// G1 						G2
/// initContextClose()
/// 						awaitDone()
/// 						<-tx.ctx.Done()
/// return
/// ---------------G2 leak-----------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	rs := &Rows{}
	rs.initContextClose(context.Background())
	// FIX: rs.close()
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14738618353152,
    "event_type": "GoCreate",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14738618356480,
    "event_type": "GoCreate",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14738618362560,
    "event_type": "GoStart",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14738618363328,
    "event_type": "GoCreate",
    "goroutine_id": 37,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "37": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 4,
    "timestamp_ns": 14738618367936,
    "event_type": "GoCreate",
    "goroutine_id": 38,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "37": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "38": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.(*Rows).initContextClose"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 5,
    "timestamp_ns": 14738618374272,
    "event_type": "GoStart",
    "goroutine_id": 37,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "37": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "38": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.(*Rows).initContextClose"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 6,
    "timestamp_ns": 14738618383872,
    "event_type": "GoSched",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.wakeNetPoller"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "37": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "38": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.(*Rows).initContextClose"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 7,
    "timestamp_ns": 14738618389696,
    "event_type": "GoStart",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.wakeNetPoller"
      },
      "36": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "37": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "38": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.(*Rows).initContextClose"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 8,
    "timestamp_ns": 14738618393152,
    "event_type": "GoStart",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "37": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "38": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.(*Rows).initContextClose"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 9,
    "timestamp_ns": 14738618395712,
    "event_type": "GoBlock",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "blocked",
        "blocked_on": "chan receive",
        "locals_hint": "runtime.chanrecv1"
      },
      "36": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "37": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "38": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.(*Rows).initContextClose"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 9,
  "timestamp_ns": 14738618395712,
  "event_type": "GoBlock",
  "goroutine_id": 35,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "35": {
      "status": "blocked",
      "blocked_on": "chan receive",
      "locals_hint": "runtime.chanrecv1"
    },
    "36": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "37": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "38": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.(*Rows).initContextClose"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoBlock", "goroutine_id": 37}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14743961608448,
    "event_type": "GoCreate",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14743961613376,
    "event_type": "GoStart",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14743961613632,
    "event_type": "GoCreate",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14743961621184,
    "event_type": "GoStart",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 3,
  "timestamp_ns": 14743961621184,
  "event_type": "GoStart",
  "goroutine_id": 36,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "35": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "36": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoCreate", "goroutine_id": 37}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14743961608448,
    "event_type": "GoCreate",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14743961613376,
    "event_type": "GoStart",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14743961613632,
    "event_type": "GoCreate",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14743961621184,
    "event_type": "GoStart",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 3,
  "timestamp_ns": 14743961621184,
  "event_type": "GoStart",
  "goroutine_id": 36,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "35": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "36": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoCreate", "goroutine_id": 8}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14743961608448,
    "event_type": "GoCreate",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14743961613376,
    "event_type": "GoStart",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14743961613632,
    "event_type": "GoCreate",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14743961621184,
    "event_type": "GoStart",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 3,
  "timestamp_ns": 14743961621184,
  "event_type": "GoStart",
  "goroutine_id": 36,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "35": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "36": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoCreate", "goroutine_id": 23}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14743961608448,
    "event_type": "GoCreate",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14743961613376,
    "event_type": "GoStart",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14743961613632,
    "event_type": "GoCreate",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14743961621184,
    "event_type": "GoStart",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 3,
  "timestamp_ns": 14743961621184,
  "event_type": "GoStart",
  "goroutine_id": 36,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "35": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "36": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoCreate", "goroutine_id": 24}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14743961608448,
    "event_type": "GoCreate",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14743961613376,
    "event_type": "GoStart",
    "goroutine_id": 35,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14743961613632,
    "event_type": "GoCreate",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14743961621184,
    "event_type": "GoStart",
    "goroutine_id": 36,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "35": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "36": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 3,
  "timestamp_ns": 14743961621184,
  "event_type": "GoStart",
  "goroutine_id": 36,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "35": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "36": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoStart", "goroutine_id": 8}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14744993772416,
    "event_type": "GoCreate",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14744993781696,
    "event_type": "GoCreate",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14744993786688,
    "event_type": "GoStart",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14744993795328,
    "event_type": "GoCreate",
    "goroutine_id": 23,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 4,
    "timestamp_ns": 14744993802432,
    "event_type": "GoStart",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 5,
    "timestamp_ns": 14744993803904,
    "event_type": "GoCreate",
    "goroutine_id": 24,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 6,
    "timestamp_ns": 14744993808064,
    "event_type": "GoCreate",
    "goroutine_id": 25,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      },
      "25": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 6,
  "timestamp_ns": 14744993808064,
  "event_type": "GoCreate",
  "goroutine_id": 25,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "21": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "22": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "23": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
    },
    "24": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    },
    "25": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoSched", "goroutine_id": 21}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14744993772416,
    "event_type": "GoCreate",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14744993781696,
    "event_type": "GoCreate",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14744993786688,
    "event_type": "GoStart",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14744993795328,
    "event_type": "GoCreate",
    "goroutine_id": 23,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 4,
    "timestamp_ns": 14744993802432,
    "event_type": "GoStart",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 5,
    "timestamp_ns": 14744993803904,
    "event_type": "GoCreate",
    "goroutine_id": 24,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 6,
    "timestamp_ns": 14744993808064,
    "event_type": "GoCreate",
    "goroutine_id": 25,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      },
      "25": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 6,
  "timestamp_ns": 14744993808064,
  "event_type": "GoCreate",
  "goroutine_id": 25,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "21": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "22": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "23": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
    },
    "24": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    },
    "25": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoBlock", "goroutine_id": 23}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14744993772416,
    "event_type": "GoCreate",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14744993781696,
    "event_type": "GoCreate",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14744993786688,
    "event_type": "GoStart",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14744993795328,
    "event_type": "GoCreate",
    "goroutine_id": 23,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 4,
    "timestamp_ns": 14744993802432,
    "event_type": "GoStart",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 5,
    "timestamp_ns": 14744993803904,
    "event_type": "GoCreate",
    "goroutine_id": 24,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 6,
    "timestamp_ns": 14744993808064,
    "event_type": "GoCreate",
    "goroutine_id": 25,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      },
      "25": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 6,
  "timestamp_ns": 14744993808064,
  "event_type": "GoCreate",
  "goroutine_id": 25,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "21": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "22": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "23": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
    },
    "24": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    },
    "25": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoBlock", "goroutine_id": 7}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14744993772416,
    "event_type": "GoCreate",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14744993781696,
    "event_type": "GoCreate",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14744993786688,
    "event_type": "GoStart",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14744993795328,
    "event_type": "GoCreate",
    "goroutine_id": 23,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 4,
    "timestamp_ns": 14744993802432,
    "event_type": "GoStart",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 5,
    "timestamp_ns": 14744993803904,
    "event_type": "GoCreate",
    "goroutine_id": 24,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 6,
    "timestamp_ns": 14744993808064,
    "event_type": "GoCreate",
    "goroutine_id": 25,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      },
      "25": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 6,
  "timestamp_ns": 14744993808064,
  "event_type": "GoCreate",
  "goroutine_id": 25,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "21": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "22": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "23": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
    },
    "24": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    },
    "25": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoStart", "goroutine_id": 38}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 0,
    "timestamp_ns": 14744993772416,
    "event_type": "GoCreate",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 1,
    "timestamp_ns": 14744993781696,
    "event_type": "GoCreate",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.traceStartReadCPU"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 2,
    "timestamp_ns": 14744993786688,
    "event_type": "GoStart",
    "goroutine_id": 21,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 3,
    "timestamp_ns": 14744993795328,
    "event_type": "GoCreate",
    "goroutine_id": 23,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime.(*traceAdvancerState).start"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 4,
    "timestamp_ns": 14744993802432,
    "event_type": "GoStart",
    "goroutine_id": 22,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 5,
    "timestamp_ns": 14744993803904,
    "event_type": "GoCreate",
    "goroutine_id": 24,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 6,
    "timestamp_ns": 14744993808064,
    "event_type": "GoCreate",
    "goroutine_id": 25,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "21": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "22": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "23": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
      },
      "24": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      },
      "25": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 6,
  "timestamp_ns": 14744993808064,
  "event_type": "GoCreate",
  "goroutine_id": 25,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "21": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "22": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "23": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "runtime/trace.(*traceMultiplexer).startLocked"
    },
    "24": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    },
    "25": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoStart", "goroutine_id": 5}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 8,
    "timestamp_ns": 14742949700480,
    "event_type": "GoSched",
    "goroutine_id": 4,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 9,
    "timestamp_ns": 14742949701312,
    "event_type": "GoStart",
    "goroutine_id": 4,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 10,
    "timestamp_ns": 14742949706688,
    "event_type": "GoBlock",
    "goroutine_id": 4,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 11,
    "timestamp_ns": 14742949707200,
    "event_type": "GoStart",
    "goroutine_id": 8,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 12,
    "timestamp_ns": 14742949709696,
    "event_type": "GoStart",
    "goroutine_id": 5,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 13,
    "timestamp_ns": 14742949711104,
    "event_type": "GoBlock",
    "goroutine_id": 5,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 14,
    "timestamp_ns": 14742949713408,
    "event_type": "GoStart",
    "goroutine_id": 6,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 15,
    "timestamp_ns": 14742949713472,
    "event_type": "GoCreate",
    "goroutine_id": 33,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 16,
    "timestamp_ns": 14742949716736,
    "event_type": "GoEnd",
    "goroutine_id": 8,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 17,
    "timestamp_ns": 14742949717184,
    "event_type": "GoStart",
    "goroutine_id": 33,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "33": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "4": {
        "status": "blocked",
        "blocked_on": "chan receive",
        "locals_hint": "runtime.chanrecv1"
      },
      "5": {
        "status": "blocked",
        "blocked_on": "chan receive",
        "locals_hint": "runtime.chanrecv1"
      },
      "6": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "7": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 17,
  "timestamp_ns": 14742949717184,
  "event_type": "GoStart",
  "goroutine_id": 33,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "33": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "4": {
      "status": "blocked",
      "blocked_on": "chan receive",
      "locals_hint": "runtime.chanrecv1"
    },
    "5": {
      "status": "blocked",
      "blocked_on": "chan receive",
      "locals_hint": "runtime.chanrecv1"
    },
    "6": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "7": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoStart", "goroutine_id": 7}


[System] You are a code execution simulator.

[User]
You are reasoning about concurrent Go program execution.

Here is a Go program:
<program>
// WEAVE_META
// outcome: leak
// concurrency_pattern: mutex
// goroutine_count: 3
// expected_nondeterminism: medium
// description: Human-written GoBench bug kernel cockroach_3710 (leak)

/*
 * Project: cockroach
 * Issue or PR  : https://github.com/cockroachdb/cockroach/pull/3710
 * Buggy version: 4afdd4860fd7c3bd9e92489f84a95e5cc7d11a0d
 * fix commit-id: cb65190f9caaf464723e7d072b1f1b69a044ef7b
 * Flaky: 2/100
 * Description: This deadlock is casued by acquiring a RLock twice in a call chain.
 * ForceRaftLogScanAndProcess(acquire s.mu.RLock()) ->MaybeAdd()->shouldQueue()->
 * getTruncatableIndexes()->RaftStatus(acquire s.mu.Rlock())
 */

package main

import (
	"os"
	"runtime/trace"
	"sync"
		"unsafe"
)

type Store struct {
	raftLogQueue *baseQueue
	replicas     map[int]*Replica

	mu struct {
		sync.RWMutex
	}
}

func (s *Store) ForceRaftLogScanAndProcess() {
	s.mu.RLock()
	for _, r := range s.replicas {
		s.raftLogQueue.MaybeAdd(r)
	}
	s.mu.RUnlock()
}

func (s *Store) RaftStatus() {
	s.mu.RLock()
	defer s.mu.RUnlock()
}

func (s *Store) processRaft() {
	go func() {
		for {
			var replicas []*Replica
			s.mu.Lock()
			for _, r := range s.replicas {
				replicas = append(replicas, r)
			}
			s.mu.Unlock()
			break
		}
	}()
}

type Replica struct {
	store *Store
}

type baseQueue struct {
	sync.Mutex
	impl *raftLogQueue
}

func (bq *baseQueue) MaybeAdd(repl *Replica) {
	bq.Lock()
	defer bq.Unlock()
	bq.impl.shouldQueue(repl)
}

type raftLogQueue struct{}

func (*raftLogQueue) shouldQueue(r *Replica) {
	getTruncatableIndexes(r)
}

func getTruncatableIndexes(r *Replica) {
	r.store.RaftStatus()
}

func NewStore() *Store {
	rlq := &raftLogQueue{}
	bq := &baseQueue{impl: rlq}
	store := &Store{
		raftLogQueue: bq,
		replicas:     make(map[int]*Replica),
	}
	r1 := &Replica{store}
	r2 := &Replica{store}

	makeKey := func(r *Replica) int {
		return int((uintptr(unsafe.Pointer(r)) >> 1) % 7)
	}
	store.replicas[makeKey(r1)] = r1
	store.replicas[makeKey(r2)] = r2

	return store
}

/// G1 										G2
/// store.ForceRaftLogScanAndProcess()
/// s.mu.RLock()
/// s.raftLogQueue.MaybeAdd()
/// bq.impl.shouldQueue()
/// getTruncatableIndexes()
/// r.store.RaftStatus()
/// 										store.processRaft()
/// 										s.mu.Lock()
/// s.mu.RLock()
/// ----------------------G1,G2 deadlock---------------------
func main() {
	if tf := os.Getenv("WEAVE_TRACE_FILE"); tf != "" {
		f, err := os.Create(tf)
		if err == nil {
			if err := trace.Start(f); err == nil {
				defer func() { trace.Stop(); f.Close() }()
			}
		}
	}

	store := NewStore()
	go store.ForceRaftLogScanAndProcess() // G1
	go store.processRaft()                // G2
}

</program>

Here is a partial execution trace showing goroutine scheduler events so far:
<trace>
[
  {
    "event_id": 8,
    "timestamp_ns": 14742949700480,
    "event_type": "GoSched",
    "goroutine_id": 4,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 9,
    "timestamp_ns": 14742949701312,
    "event_type": "GoStart",
    "goroutine_id": 4,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 10,
    "timestamp_ns": 14742949706688,
    "event_type": "GoBlock",
    "goroutine_id": 4,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 11,
    "timestamp_ns": 14742949707200,
    "event_type": "GoStart",
    "goroutine_id": 8,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 12,
    "timestamp_ns": 14742949709696,
    "event_type": "GoStart",
    "goroutine_id": 5,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 13,
    "timestamp_ns": 14742949711104,
    "event_type": "GoBlock",
    "goroutine_id": 5,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 14,
    "timestamp_ns": 14742949713408,
    "event_type": "GoStart",
    "goroutine_id": 6,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 15,
    "timestamp_ns": 14742949713472,
    "event_type": "GoCreate",
    "goroutine_id": 33,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 16,
    "timestamp_ns": 14742949716736,
    "event_type": "GoEnd",
    "goroutine_id": 8,
    "goroutines": "... [TRUNCATED FOR LENGTH] ...",
    "channels": {},
    "mutexes": {}
  },
  {
    "event_id": 17,
    "timestamp_ns": 14742949717184,
    "event_type": "GoStart",
    "goroutine_id": 33,
    "goroutines": {
      "1": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "33": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "4": {
        "status": "blocked",
        "blocked_on": "chan receive",
        "locals_hint": "runtime.chanrecv1"
      },
      "5": {
        "status": "blocked",
        "blocked_on": "chan receive",
        "locals_hint": "runtime.chanrecv1"
      },
      "6": {
        "status": "running",
        "blocked_on": null,
        "locals_hint": "unknown"
      },
      "7": {
        "status": "runnable",
        "blocked_on": null,
        "locals_hint": "main.main"
      }
    },
    "channels": {},
    "mutexes": {}
  }
]
</trace>

The current goroutine states are:
<current_state>
{
  "event_id": 17,
  "timestamp_ns": 14742949717184,
  "event_type": "GoStart",
  "goroutine_id": 33,
  "goroutines": {
    "1": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "33": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "4": {
      "status": "blocked",
      "blocked_on": "chan receive",
      "locals_hint": "runtime.chanrecv1"
    },
    "5": {
      "status": "blocked",
      "blocked_on": "chan receive",
      "locals_hint": "runtime.chanrecv1"
    },
    "6": {
      "status": "running",
      "blocked_on": null,
      "locals_hint": "unknown"
    },
    "7": {
      "status": "runnable",
      "blocked_on": null,
      "locals_hint": "main.main"
    }
  },
  "channels": {},
  "mutexes": {}
}
</current_state>

Predict the next scheduler event. What happens next?
Respond in JSON only — no markdown fences, no text outside the JSON object:
{"event_type":"GoStart|GoBlock|GoUnblock|GoCreate|GoEnd|GoSched","goroutine_id":<integer>,"reasoning":"<brief explanation>","confidence":"high|medium|low"}

[Assistant] {"event_type": "GoSched", "goroutine_id": 36}