bug_pairs.jsonl

{"family": "elementwise", "bug_class": "mask_leak", "correct_name": "gelu", "buggy_name": "elementwise_nomask", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n\n@triton.jit\ndef gelu(x_ptr, out_ptr, M, N, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        x = tl.load(x_ptr + row * N + cols, mask=mask, other=0.0)\n        y = 0.5 * x * (1.0 + tl.erf(x * 0.7071067811865476))\n        tl.store(out_ptr + row * N + cols, y, mask=mask)", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*N\n# litmus: buffer w_ptr = N\n# litmus: buffer b_ptr = N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n\n@triton.jit\ndef elementwise_scale_bias(x_ptr, w_ptr, b_ptr, out_ptr, M, N, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        x = tl.load(x_ptr + row * N + cols)\n        w = tl.load(w_ptr + cols)\n        b = tl.load(b_ptr + cols)\n        tl.store(out_ptr + row * N + cols, x * w + b)", "why_standard_misses": "N=512 is a multiple of BLOCK=32 so no tail exists -- and even at a ragged shape the spilled write lands in a neighbouring allocation, so the kernel's own output is unchanged and no allclose test can see it", "witness_inputs": "", "witness_dims": "", "numerically_observable": false}
{"family": "reduction", "bug_class": "mask_leak", "correct_name": "row_max", "buggy_name": "row_sum_nomask", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_max(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), float('-inf'), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=float('-inf'))\n        acc = tl.maximum(acc, v)\n    tl.store(out_ptr + row, tl.max(acc, axis=0))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_reduce(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.zeros((BLOCK,), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols)\n        acc += v\n    tl.store(out_ptr + row, tl.sum(acc, axis=0))", "why_standard_misses": "N=512 is a multiple of BLOCK=32, so no tail tile exists", "witness_inputs": "{\"x\": {\"shape\": [3, 33], \"truncated\": false, \"values\": [[0.9323224351204542, -0.13484240850688187, -1.0977711087115172, 1.2093136358526926, -1.5200609774258935, -0.3659055784186133, 0.08753656217963342, -0.673525657000616, -0.31220063548687593, 0.6517512317274256, 0.10188336399475949, 2.1183280668541165, -0.1747104908892027, -0.05302204609851407, 1.1776554100520484, 1.034069668664329, 1.3570641388632136, -0.26345967846302504, 0.6563534008927115, -1.0510361039263771, -0.2951569873791522, -0.6036145420186865, 0.4275727371703606, 1.164091172456542, -0.18349346919422196, -0.06950722813263917, 0.9665602467906304, -0.6179201120759003, 1.307118331059199, -1.809250277245433, -0.24609517424533933, 0.047437465889070246, -0.1726226634799063], [-0.4265367270080289, -0.8613653826306371, -1.884530122726135, -0.842549971820494, 0.4946735479336724, 0.4465705367621375, 1.85655320464552, 0.7426474381606197, 1.6626073177772, -0.7445255020708731, -0.8749235310133816, -0.1406877389606945, 0.4921162579956519, -0.23537017889100362, -0.2329928411829563, 1.0203585485236448, -0.3950961781815714, 1.586702826547813, 0.7790573295349854, 0.6084367506154511, -0.7746609271150169, 0.5145944304272745, 0.30077846461329444, 1.0300494046122595, -0.38908207485805274, 1.1903487622827287, -2.3898260878140896, -0.22780056268989937, 1.780801496873732, 0.052726437928369584, -0.2905865934347286, 1.5681129649560095, -0.34023019162555135], [-0.590480507527205, 0.3952876666332603, 0.41516876928919283, 0.3747274728808734, -0.6381902366431598, -0.4137973997801163, -0.38841359754271754, 0.9259711547147788, -0.5889466811888183, -0.131217053696824, 0.00859743441700256, 0.12076421285922352, 0.23244373318601652, 0.12115874783464392, 0.7007774085680416, -1.1021614558814128, -0.20761115023330756, 1.0637356081910359, 0.4318807786996173, 0.5185060470598175, -0.12765925263970465, 0.0023738622684158404, 0.32685676241280304, 1.574304297758674, -0.497854771468547, 1.1708647780992363, -1.1308104177840286, -0.5076025950103698, 0.3658925302392737, 0.11861084275632296, -0.7123668701917418, 0.15577888425550526, 1.376028723925904]]}, \"w\": {\"shape\": [33], \"truncated\": false, \"values\": [-0.8521657544163167, -0.9913974466747576, -0.6171660403968796, 0.36085432621749663, 0.725788747445546, 0.7048039780615126, 0.856549025221355, 1.1007333725162887, -0.5368462420915631, 0.4897982425989597, 1.9345120072465691, 0.6114975628959227, 2.545833547596705, 0.8446100794186416, -0.4976219513230361, -0.6579083416586656, 0.15435453835917065, -1.2352837415993694, -1.5907987411963338, -1.3607153546827384, 0.4951250366915605, -1.5295864071475327, 0.02331219452117253, 1.5065421776698205, -1.0374513272097987, 0.6412381170410911, 1.4182025956774233, 0.4869832493833102, -1.187126614866286, -0.5977878136525421, 0.5499482947031736, -1.282288774354227, -2.0776904842464647]}, \"b\": {\"shape\": [33], \"truncated\": false, \"values\": [2.061194735710628, -0.5525172695521284, 0.5098670391746202, -1.363457812071284, -0.19746682414381686, 1.1420645413492911, 0.6255783450063146, -0.061071397736976014, -0.8579834503967044, 1.983500446602315, -0.06843040976465128, -1.954830554634629, 1.0475056154390079, -1.611744070743091, -0.17456089960628418, -0.015990131632859814, -0.9816276242759144, 0.18854014565014418, -0.4928272722487404, 0.5059976051141007, 0.8652126974567892, 0.4340038332999275, 0.2040632519731441, -0.5270238182528804, 1.0758099641593462, -0.6375573748121397, 1.716919815122407, 0.08713222254118819, 2.0350573599285773, -0.16991243315971818, -0.20766799832413915, 0.42743737204579724, 0.6971226418809447]}}", "witness_dims": "{\"M\": 3, \"N\": 33}", "numerically_observable": true}
{"family": "softmax", "bug_class": "mask_leak", "correct_name": "softmax", "buggy_name": "softmax_nomask", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n\n@triton.jit\ndef softmax(x_ptr, out_ptr, M, N, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    mx = float('-inf')\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        mx = tl.maximum(mx, tl.max(v, axis=0))\n    denom = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        e = tl.where(mask, tl.exp(v - mx), 0.0)\n        denom += tl.sum(e, axis=0)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        tl.store(out_ptr + row * N + cols, tl.exp(v - mx) / denom, mask=mask)", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n\n@triton.jit\ndef softmax(x_ptr, out_ptr, M, N, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    mx = float('-inf')\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols)\n        mx = tl.maximum(mx, tl.max(v, axis=0))\n    denom = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols)\n        e = tl.where(mask, tl.exp(v - mx), 0.0)\n        denom += tl.sum(e, axis=0)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols)\n        tl.store(out_ptr + row * N + cols, tl.exp(v - mx) / denom)", "why_standard_misses": "N=512 is a multiple of BLOCK=32, so no tail tile exists", "witness_inputs": "{\"x\": {\"shape\": [3, 33], \"truncated\": false, \"values\": [[0.9323224351204542, -0.13484240850688187, -1.0977711087115172, 1.2093136358526926, -1.5200609774258935, -0.3659055784186133, 0.08753656217963342, -0.673525657000616, -0.31220063548687593, 0.6517512317274256, 0.10188336399475949, 2.1183280668541165, -0.1747104908892027, -0.05302204609851407, 1.1776554100520484, 1.034069668664329, 1.3570641388632136, -0.26345967846302504, 0.6563534008927115, -1.0510361039263771, -0.2951569873791522, -0.6036145420186865, 0.4275727371703606, 1.164091172456542, -0.18349346919422196, -0.06950722813263917, 0.9665602467906304, -0.6179201120759003, 1.307118331059199, -1.809250277245433, -0.24609517424533933, 0.047437465889070246, -0.1726226634799063], [-0.4265367270080289, -0.8613653826306371, -1.884530122726135, -0.842549971820494, 0.4946735479336724, 0.4465705367621375, 1.85655320464552, 0.7426474381606197, 1.6626073177772, -0.7445255020708731, -0.8749235310133816, -0.1406877389606945, 0.4921162579956519, -0.23537017889100362, -0.2329928411829563, 1.0203585485236448, -0.3950961781815714, 1.586702826547813, 0.7790573295349854, 0.6084367506154511, -0.7746609271150169, 0.5145944304272745, 0.30077846461329444, 1.0300494046122595, -0.38908207485805274, 1.1903487622827287, -2.3898260878140896, -0.22780056268989937, 1.780801496873732, 0.052726437928369584, -0.2905865934347286, 1.5681129649560095, -0.34023019162555135], [-0.590480507527205, 0.3952876666332603, 0.41516876928919283, 0.3747274728808734, -0.6381902366431598, -0.4137973997801163, -0.38841359754271754, 0.9259711547147788, -0.5889466811888183, -0.131217053696824, 0.00859743441700256, 0.12076421285922352, 0.23244373318601652, 0.12115874783464392, 0.7007774085680416, -1.1021614558814128, -0.20761115023330756, 1.0637356081910359, 0.4318807786996173, 0.5185060470598175, -0.12765925263970465, 0.0023738622684158404, 0.32685676241280304, 1.574304297758674, -0.497854771468547, 1.1708647780992363, -1.1308104177840286, -0.5076025950103698, 0.3658925302392737, 0.11861084275632296, -0.7123668701917418, 0.15577888425550526, 1.376028723925904]]}, \"w\": {\"shape\": [33], \"truncated\": false, \"values\": [-0.8521657544163167, -0.9913974466747576, -0.6171660403968796, 0.36085432621749663, 0.725788747445546, 0.7048039780615126, 0.856549025221355, 1.1007333725162887, -0.5368462420915631, 0.4897982425989597, 1.9345120072465691, 0.6114975628959227, 2.545833547596705, 0.8446100794186416, -0.4976219513230361, -0.6579083416586656, 0.15435453835917065, -1.2352837415993694, -1.5907987411963338, -1.3607153546827384, 0.4951250366915605, -1.5295864071475327, 0.02331219452117253, 1.5065421776698205, -1.0374513272097987, 0.6412381170410911, 1.4182025956774233, 0.4869832493833102, -1.187126614866286, -0.5977878136525421, 0.5499482947031736, -1.282288774354227, -2.0776904842464647]}, \"b\": {\"shape\": [33], \"truncated\": false, \"values\": [2.061194735710628, -0.5525172695521284, 0.5098670391746202, -1.363457812071284, -0.19746682414381686, 1.1420645413492911, 0.6255783450063146, -0.061071397736976014, -0.8579834503967044, 1.983500446602315, -0.06843040976465128, -1.954830554634629, 1.0475056154390079, -1.611744070743091, -0.17456089960628418, -0.015990131632859814, -0.9816276242759144, 0.18854014565014418, -0.4928272722487404, 0.5059976051141007, 0.8652126974567892, 0.4340038332999275, 0.2040632519731441, -0.5270238182528804, 1.0758099641593462, -0.6375573748121397, 1.716919815122407, 0.08713222254118819, 2.0350573599285773, -0.16991243315971818, -0.20766799832413915, 0.42743737204579724, 0.6971226418809447]}}", "witness_dims": "{\"M\": 3, \"N\": 33}", "numerically_observable": true}
{"family": "matmul", "bug_class": "mask_leak", "correct_name": "matmul_fp16", "buggy_name": "matmul_no_k_mask", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK_M = 32\n# litmus: constexpr BLOCK_N = 32\n# litmus: constexpr BLOCK_K = 32\n# litmus: buffer a_ptr = M*K\n# litmus: buffer b_ptr = K*N\n# litmus: buffer c_ptr = M*N\n# litmus: grid = cdiv(M, BLOCK_M), cdiv(N, BLOCK_N)\n\n@triton.jit\ndef matmul(a_ptr, b_ptr, c_ptr, M, N, K,\n           BLOCK_M: tl.constexpr, BLOCK_N: tl.constexpr, BLOCK_K: tl.constexpr):\n    pm = tl.program_id(0)\n    pn = tl.program_id(1)\n    offs_m = pm * BLOCK_M + tl.arange(0, BLOCK_M)\n    offs_n = pn * BLOCK_N + tl.arange(0, BLOCK_N)\n    acc = tl.zeros((BLOCK_M, BLOCK_N), dtype=tl.float32)\n    for k in range(0, tl.cdiv(K, BLOCK_K)):\n        offs_k = k * BLOCK_K + tl.arange(0, BLOCK_K)\n        a = tl.load(a_ptr + offs_m[:, None] * K + offs_k[None, :],\n                    mask=(offs_m[:, None] < M) & (offs_k[None, :] < K), other=0.0)\n        b = tl.load(b_ptr + offs_k[:, None] * N + offs_n[None, :],\n                    mask=(offs_k[:, None] < K) & (offs_n[None, :] < N), other=0.0)\n        acc += tl.dot(a, b)\n    tl.store(c_ptr + offs_m[:, None] * N + offs_n[None, :], acc,\n             mask=(offs_m[:, None] < M) & (offs_n[None, :] < N))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK_M = 32\n# litmus: constexpr BLOCK_N = 32\n# litmus: constexpr BLOCK_K = 32\n# litmus: buffer a_ptr = M*K\n# litmus: buffer b_ptr = K*N\n# litmus: buffer c_ptr = M*N\n# litmus: grid = cdiv(M, BLOCK_M), cdiv(N, BLOCK_N)\n\n@triton.jit\ndef matmul(a_ptr, b_ptr, c_ptr, M, N, K,\n           BLOCK_M: tl.constexpr, BLOCK_N: tl.constexpr, BLOCK_K: tl.constexpr):\n    pm = tl.program_id(0)\n    pn = tl.program_id(1)\n    offs_m = pm * BLOCK_M + tl.arange(0, BLOCK_M)\n    offs_n = pn * BLOCK_N + tl.arange(0, BLOCK_N)\n    acc = tl.zeros((BLOCK_M, BLOCK_N), dtype=tl.float32)\n    for k in range(0, tl.cdiv(K, BLOCK_K)):\n        offs_k = k * BLOCK_K + tl.arange(0, BLOCK_K)\n        a = tl.load(a_ptr + offs_m[:, None] * K + offs_k[None, :],\n                    mask=(offs_m[:, None] < M), other=0.0)\n        b = tl.load(b_ptr + offs_k[:, None] * N + offs_n[None, :],\n                    mask=(offs_n[None, :] < N), other=0.0)\n        acc += tl.dot(a, b)\n    tl.store(c_ptr + offs_m[:, None] * N + offs_n[None, :], acc,\n             mask=(offs_m[:, None] < M) & (offs_n[None, :] < N))", "why_standard_misses": "M, N and K are all multiples of the block sizes", "witness_inputs": "{\"a\": {\"shape\": [33, 33], \"truncated\": false, \"values\": [[-1.0748366301390833, -1.2726386174365862, 0.1279170812576446, 0.8101496187256504, 0.532242471968371, 0.2531135831967665, -1.2944793771672414, 1.3746620788661008, -1.9738913399051794, -0.6994014763584023, -0.5944289753341545, 1.975460784799716, 0.5942356035795224, 0.4592726014176917, 1.9200064333777975, 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-0.40360768260943813, 0.10178221019816133, -0.3606833867154866, -0.6625561247738918, 2.8036065829770176, -0.3178235625242121, -0.42333616502457005, -0.10284104573688058, 1.7654035763064484, -0.07664736858184522, 0.13441640171256003, 1.5114704880483079, 0.9320128273059292, 1.5996937335536572, 1.1256501221218385, -0.6877900667366624, 0.6520484111106634, -1.85640538761479, -0.40352580978477254, 1.9494216888263285, -0.14912186835429422, 0.39771370736393563], [0.21344690481284462, 1.735041420818353, 1.0900652800053543, -0.367762176251474, -0.5720224235332447, -0.3689741891256407, -0.6378304745594062, -1.0396458004665465, 1.2513416397199013, 0.5745821931002821, -0.5370212699515421, 1.8893185023597503, 1.894173726997504, -0.43969060098155033, 0.2198851718635022, 2.2529762620202978, 1.3057699175343978, -0.11002860512966929, 2.1947533842780684, -0.5295446140047319, -0.4575163626661797, -1.6446271296895891, -1.246873664706361, -0.014599278109414825, 1.36415245963347, 0.9453094934285363, -1.175727504844197, 0.030440411809441088, -0.7898461457340464, -0.04668934176492838, 1.1177111494939667, 0.9138549743424085, 0.13727671669746389]]}}", "witness_dims": "{\"M\": 33, \"N\": 33, \"K\": 33}", "numerically_observable": true}
{"family": "reduction", "bug_class": "reduction_init", "correct_name": "row_max", "buggy_name": "row_sum_init_one", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_max(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), float('-inf'), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=float('-inf'))\n        acc = tl.maximum(acc, v)\n    tl.store(out_ptr + row, tl.max(acc, axis=0))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_reduce(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), 1.0 / BLOCK, dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        acc += v\n    tl.store(out_ptr + row, tl.sum(acc, axis=0))", "why_standard_misses": "a constant offset of 1.0 on a sum of ~256 uniform values is a 0.4% relative error, inside rtol=1e-2", "witness_inputs": "{\"x\": {\"shape\": [2, 32], \"truncated\": false, \"values\": [[1.3640195228050165e-05, -6.271425885369812e-05, 0.0002491574809406205, 4.958468028771155e-05, 0.001182665742342288, 0.0014049343623371935, 5.121767282302068e-06, -0.00027448581677559354, 0.00045090785195024214, -0.0010611754068181793, 0.0002702059525341101, -0.001000725175431826, 0.0005041299711134938, -0.0003497537729459638, 0.0004967331047528937, -0.00047277363991025516, -7.922958692114135e-05, 0.0013191584031693128, 0.0003477229170723744, -7.730866072443808e-05, -4.958810116292692e-05, 6.485567860690553e-05, -0.002025719620739827, 0.0004039208180734784, 0.00044457628328337806, 0.0009811785846381032, 0.0010578945588044664, -0.0018627104973384374, 0.0008895246143854409, 0.00032740331792915683, -0.0004647056323105564, 0.0005614830119226252], [0.0012756537197246719, 0.0007158818858830026, 0.0004933970166185707, 0.0006022845828675233, -0.0004302227042122171, 0.0009995145255388249, 0.0009254095175517151, -0.0007178369390394483, -0.0007755243754113115, -0.00011557759572248035, -0.0016417642269099734, 0.0016325640307554702, -0.0002199943346906009, -0.001030192348086365, -0.0006461228569510426, -0.000692532961738709, 0.00015531876272188036, -0.0003304799701007843, -0.0006666306986131324, 0.0014200960263577014, -0.0014494440734879918, 0.0011756114084950967, 0.0018483454305422832, 0.001789578369698995, -0.0017074980697834332, -0.0012779575959290205, -6.48978779081474e-05, 0.0006457781353429509, -0.0010309056457177574, 0.0009208684300705492, -0.00030750395847272587, 0.0009297243955343462]]}}", "witness_dims": "{\"M\": 2, \"N\": 32}", "numerically_observable": true}
{"family": "reduction", "bug_class": "reduction_init", "correct_name": "row_max", "buggy_name": "row_max_init_zero", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_max(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), float('-inf'), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=float('-inf'))\n        acc = tl.maximum(acc, v)\n    tl.store(out_ptr + row, tl.max(acc, axis=0))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_max(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), 0.0, dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=float('-inf'))\n        acc = tl.maximum(acc, v)\n    tl.store(out_ptr + row, tl.max(acc, axis=0))", "why_standard_misses": "torch.rand() is non-negative, so max(0, row) == max(row) always -- the identity is never exercised", "witness_inputs": "{\"x\": {\"shape\": [2, 32], \"truncated\": false, \"values\": [[-2.0217323059579484, -1.1205637636917152, -2.4247685045640193, -1.3973503794981748, -1.0511792194528577, -2.486817219473164, -2.486142150540828, -1.566083548064621, -1.5546883794496305, -1.303046759826813, -1.4304403953391798, -1.2822758667527667, -2.1291706144278866, -2.7110253839185936, -1.294009285080363, -3.1339114562511314, -1.5766551375058877, -1.4499467547478797, -1.7094037478637614, -2.1437643346652493, -2.7100458066200233, -1.698761531933239, -2.99509693477206, -1.777741274600238, -3.1047936013272235, -2.3049636196778547, -1.0933945724315703, -1.0752201571891646, -1.2676891660465932, -1.4146107860999728, -1.407063513780138, -1.0324062101766636], [-1.61025512968625, -1.7852003100816285, -1.371095688674866, -2.2324970247754026, -1.5462081747220422, -2.665862883109307, -1.1493544092193535, -1.1906553036190992, -1.5528986201304757, -2.1076910529255386, -1.9343039493562955, -1.8581897683705608, -1.934123505302985, -1.8163791946381114, -1.7391517859774557, -1.0479485477850976, -1.7482854674162127, -1.455742074216712, -1.0671163891755486, -2.922170470854413, -1.4489532197286126, -2.239162174849211, -1.412313933496983, -1.6100899198125727, -1.4934579112430093, -2.086065903614463, -2.7749586395748223, -1.3072493309869202, -1.39073549385943, -1.0741024461317035, -1.1889274637642353, -1.4368708771941097]]}}", "witness_dims": "{\"M\": 2, \"N\": 32}", "numerically_observable": true}
{"family": "matmul", "bug_class": "reduction_init", "correct_name": "matmul_fp16", "buggy_name": "matmul_acc_init_one", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK_M = 32\n# litmus: constexpr BLOCK_N = 32\n# litmus: constexpr BLOCK_K = 32\n# litmus: buffer a_ptr = M*K\n# litmus: buffer b_ptr = K*N\n# litmus: buffer c_ptr = M*N\n# litmus: grid = cdiv(M, BLOCK_M), cdiv(N, BLOCK_N)\n\n@triton.jit\ndef matmul(a_ptr, b_ptr, c_ptr, M, N, K,\n           BLOCK_M: tl.constexpr, BLOCK_N: tl.constexpr, BLOCK_K: tl.constexpr):\n    pm = tl.program_id(0)\n    pn = tl.program_id(1)\n    offs_m = pm * BLOCK_M + tl.arange(0, BLOCK_M)\n    offs_n = pn * BLOCK_N + tl.arange(0, BLOCK_N)\n    acc = tl.zeros((BLOCK_M, BLOCK_N), dtype=tl.float32)\n    for k in range(0, tl.cdiv(K, BLOCK_K)):\n        offs_k = k * BLOCK_K + tl.arange(0, BLOCK_K)\n        a = tl.load(a_ptr + offs_m[:, None] * K + offs_k[None, :],\n                    mask=(offs_m[:, None] < M) & (offs_k[None, :] < K), other=0.0)\n        b = tl.load(b_ptr + offs_k[:, None] * N + offs_n[None, :],\n                    mask=(offs_k[:, None] < K) & (offs_n[None, :] < N), other=0.0)\n        acc += tl.dot(a, b)\n    tl.store(c_ptr + offs_m[:, None] * N + offs_n[None, :], acc,\n             mask=(offs_m[:, None] < M) & (offs_n[None, :] < N))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK_M = 32\n# litmus: constexpr BLOCK_N = 32\n# litmus: constexpr BLOCK_K = 32\n# litmus: buffer a_ptr = M*K\n# litmus: buffer b_ptr = K*N\n# litmus: buffer c_ptr = M*N\n# litmus: grid = cdiv(M, BLOCK_M), cdiv(N, BLOCK_N)\n\n@triton.jit\ndef matmul(a_ptr, b_ptr, c_ptr, M, N, K,\n           BLOCK_M: tl.constexpr, BLOCK_N: tl.constexpr, BLOCK_K: tl.constexpr):\n    pm = tl.program_id(0)\n    pn = tl.program_id(1)\n    offs_m = pm * BLOCK_M + tl.arange(0, BLOCK_M)\n    offs_n = pn * BLOCK_N + tl.arange(0, BLOCK_N)\n    acc = tl.full((BLOCK_M, BLOCK_N), 1.0, dtype=tl.float32)\n    for k in range(0, tl.cdiv(K, BLOCK_K)):\n        offs_k = k * BLOCK_K + tl.arange(0, BLOCK_K)\n        a = tl.load(a_ptr + offs_m[:, None] * K + offs_k[None, :],\n                    mask=(offs_m[:, None] < M) & (offs_k[None, :] < K), other=0.0)\n        b = tl.load(b_ptr + offs_k[:, None] * N + offs_n[None, :],\n                    mask=(offs_k[:, None] < K) & (offs_n[None, :] < N), other=0.0)\n        acc += tl.dot(a, b)\n    tl.store(c_ptr + offs_m[:, None] * N + offs_n[None, :], acc,\n             mask=(offs_m[:, None] < M) & (offs_n[None, :] < N))", "why_standard_misses": "K=512 with uniform inputs gives entries of order 128, so a +1.0 offset is under the 1e-2 relative tolerance", "witness_inputs": "{\"a\": {\"shape\": [4, 4], \"truncated\": false, \"values\": [[0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0]]}, \"b\": {\"shape\": [4, 4], \"truncated\": false, \"values\": [[0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0], [0.0, 0.0, 0.0, 0.0]]}}", "witness_dims": "{\"M\": 4, \"N\": 4, \"K\": 4}", "numerically_observable": true}
{"family": "softmax", "bug_class": "no_max_subtract", "correct_name": "softmax", "buggy_name": "softmax_nomaxsub", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n\n@triton.jit\ndef softmax(x_ptr, out_ptr, M, N, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    mx = float('-inf')\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        mx = tl.maximum(mx, tl.max(v, axis=0))\n    denom = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        e = tl.where(mask, tl.exp(v - mx), 0.0)\n        denom += tl.sum(e, axis=0)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        tl.store(out_ptr + row * N + cols, tl.exp(v - mx) / denom, mask=mask)", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n\n@triton.jit\ndef softmax(x_ptr, out_ptr, M, N, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    mx = float('-inf')\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        mx = tl.maximum(mx, tl.max(v, axis=0))\n    denom = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        e = tl.where(mask, tl.exp(v), 0.0)\n        denom += tl.sum(e, axis=0)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=float('-inf'))\n        tl.store(out_ptr + row * N + cols, tl.exp(v) / denom, mask=mask)", "why_standard_misses": "torch.rand() lives in [0,1), where exp(x) never approaches the fp32 range limit", "witness_inputs": "{\"x\": {\"shape\": [2, 32], \"truncated\": false, \"values\": [[200.0, -1.6317065930677275, 1.3217959639836427, 0.08268651793293419, -1.176789075556173, 1.15634948500117, 0.9812034560390803, -1.450232629943399, 1.1097434560609962, -0.6118264608379209, -0.9788509639537006, 0.7335103590365222, -0.7359528732349158, -1.4723083533772292, -0.604586815202591, -0.44243931825931104, -0.041550302195256426, -0.813399947059634, 0.19988849963101607, 0.3058523569251492, -0.04195743276306992, -0.04419802690076879, -2.587726367372583, 0.19537124370042144, -1.0253621593455575, -1.6537885696206223, -0.1875999459546322, -1.7198022770090309, 0.12154065984870106, 1.7510917005767161, 1.158081947244671, -0.3811254992638406], [-1.3765545085718065, 0.14027541418961761, -0.3941151914000429, 0.817545064242547, -0.8611085439572549, -0.7492967467774145, -0.6231931514664533, 1.128681662043641, 1.0538378248948594, -0.25387131621034104, 0.7305169397227304, -0.5579763257127764, 0.24420166211985114, -1.0391281322064165, 0.16542835332157446, -0.3082462580767681, 0.2759840359971707, -0.14531797911144112, -0.38163557791523345, 1.1977392915072063, -0.6649148066985354, -1.5714543754661177, 0.36372506345541805, -0.917267325744919, -0.3717683584339326, 0.3854861868459564, -0.5968691433875065, -0.6578391856405483, -0.020393888025675006, 1.2847599735410689, -1.542826915713378, 0.587250268186104]]}}", "witness_dims": "{\"M\": 2, \"N\": 32}", "numerically_observable": true}
{"family": "attention", "bug_class": "no_max_subtract", "correct_name": "attention", "buggy_name": "attention_nomaxsub", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK_D = 32\n# litmus: buffer q_ptr = M*D\n# litmus: buffer k_ptr = L*D\n# litmus: buffer v_ptr = L*D\n# litmus: buffer out_ptr = M*D\n# litmus: grid = M\n\n@triton.jit\ndef attention(q_ptr, k_ptr, v_ptr, out_ptr, M, L, D, BLOCK_D: tl.constexpr):\n    i = tl.program_id(0)\n    ds = tl.arange(0, BLOCK_D)\n    dmask = ds < D\n    q = tl.load(q_ptr + i * D + ds, mask=dmask, other=0.0)\n    mx = float('-inf')\n    for j in range(0, L):\n        kv = tl.load(k_ptr + j * D + ds, mask=dmask, other=0.0)\n        mx = tl.maximum(mx, tl.sum(q * kv, axis=0) * 0.17677669529663687)\n    denom = 0.0\n    acc = tl.zeros((BLOCK_D,), dtype=tl.float32)\n    for j in range(0, L):\n        kv = tl.load(k_ptr + j * D + ds, mask=dmask, other=0.0)\n        s = tl.sum(q * kv, axis=0) * 0.17677669529663687\n        p = tl.exp(s - mx)\n        denom += p\n        vv = tl.load(v_ptr + j * D + ds, mask=dmask, other=0.0)\n        acc += p * vv\n    tl.store(out_ptr + i * D + ds, acc / denom, mask=dmask)", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK_D = 32\n# litmus: buffer q_ptr = M*D\n# litmus: buffer k_ptr = L*D\n# litmus: buffer v_ptr = L*D\n# litmus: buffer out_ptr = M*D\n# litmus: grid = M\n\n@triton.jit\ndef attention(q_ptr, k_ptr, v_ptr, out_ptr, M, L, D, BLOCK_D: tl.constexpr):\n    i = tl.program_id(0)\n    ds = tl.arange(0, BLOCK_D)\n    dmask = ds < D\n    q = tl.load(q_ptr + i * D + ds, mask=dmask, other=0.0)\n    mx = float('-inf')\n    for j in range(0, L):\n        kv = tl.load(k_ptr + j * D + ds, mask=dmask, other=0.0)\n        mx = tl.maximum(mx, tl.sum(q * kv, axis=0) * 0.17677669529663687)\n    denom = 0.0\n    acc = tl.zeros((BLOCK_D,), dtype=tl.float32)\n    for j in range(0, L):\n        kv = tl.load(k_ptr + j * D + ds, mask=dmask, other=0.0)\n        s = tl.sum(q * kv, axis=0) * 0.17677669529663687\n        p = tl.exp(s)\n        denom += p\n        vv = tl.load(v_ptr + j * D + ds, mask=dmask, other=0.0)\n        acc += p * vv\n    tl.store(out_ptr + i * D + ds, acc / denom, mask=dmask)", "why_standard_misses": "unit-scale q and k keep the scores near zero", "witness_inputs": "{\"q\": {\"shape\": [4, 32], \"truncated\": false, \"values\": [[-24.986394524353937, -58.8677056935254, 136.8091412817628, 98.4846584556703, -141.90936613026366, 57.92291122033178, -26.18228618310603, -18.036587790902377, 16.136338992120105, -92.00511661049477, -84.77698096431314, -47.58644104490596, -55.3344933411368, -110.75195710686633, 58.72403365363463, -7.678707495321565, 19.621273694943955, 68.61785854032756, 13.265282652687244, -81.6651539972112, -37.51340573530533, 73.98368329339534, -3.6012334248103977, -98.59129066102571, -70.94465505225645, -91.02448884967129, 24.48513289579856, -59.89963206838889, -9.491301838151886, -56.28462612711182, 33.057364662579545, -78.87498386481066], [0.7603457924110417, -1.4235649196649909, 1.8251697438591643, -0.8484181808137538, 0.15072182086931216, -1.5644236303945342, -0.8872151351855841, -0.9517765934917211, 0.3809132015775415, 0.6497887065077564, -0.9206247750795987, -0.5557406210302869, -0.18672496566134883, 0.24104470608242015, 0.21181402277050884, -1.1164477437517717, -1.1091258820582612, -1.4024939110803962, -1.226473905585101, -0.6310819590899202, -0.5437140997268878, 1.259438518637766, -0.559208642033918, -1.1688648951064953, -1.4420963945910792, 0.6925850421105483, -0.6804225027339043, -0.8779043128765279, -0.7346977969042491, -0.8639369071373086, -0.03779598533986895, -0.25537141711837286], [0.2649708084090205, -2.1373291567952792, 0.5861359612274133, -1.421073087743797, 0.3269590328175011, 1.0659562497135184, -0.8039736964573706, -0.43793415973643435, -1.24881004660128, -0.3650068388623692, -0.1289422089856872, -1.107195682512445, 0.8471980861748758, 0.933797953510037, 0.8928231187242696, -1.3381356505669022, -1.6159780778425195, 0.26088210640947745, 0.26971229850529943, -2.0994800111132763, 0.30426089868344725, -0.463839033238975, 0.5088637300342912, 0.9603122688492125, -0.593680581277238, 1.420657955072825, -0.42040762732254267, 1.1906091350418941, -1.0543299450538701, 1.650660731035215, -0.32546366952533695, -1.0474784038906861], [0.40118640950618467, 0.22770673668621158, -0.35056472262059707, 0.8373914634399333, 0.3668320651859748, 0.770682266703516, -0.6243363568069182, 0.22592741851337003, 0.7142243671762141, -0.29046887466067045, -0.4764145301799316, 2.520489614671167, -0.6298934185846036, 0.0969678632429039, 1.0484526758690385, -0.710399711098437, 0.7448473023136876, 0.44612570829093595, -0.7045211449892591, 1.3782220632370192, 0.90215614226089, -0.6514550608835349, 0.6206756709506865, -1.9652702657469363, 1.676988985645428, 0.27967347470774023, 0.11349995690894138, 1.189430201701724, 0.21280167329496474, 0.4873671206023092, -2.2812129594394195, 3.636292685855558]]}, \"k\": {\"shape\": [8, 32], \"truncated\": false, \"values\": [[0.4777419556066451, 0.4042890083836756, 0.04773548056489078, -1.402599737484425, 0.5553528516280092, 0.6772586253464523, 1.5710473919454524, -0.33452706984948644, 0.8466651078026631, -0.4449443729325096, -0.04014177977747255, -0.4431682452993693, -0.10765313709431074, 0.3775775571675236, -1.7667690591576213, -0.5331934329694791, 0.7227549675496802, -0.31878111257044744, 1.2609294764636598, -1.2327362330674099, 0.5240962473831902, -1.4331261861709734, -0.15137432045554577, -0.39802347509515723, 1.0668490244540043, -0.07999522317559259, -0.8829967365176751, -0.658834901240982, 0.3640542630021909, -1.2714810512411474, -0.5352552266430427, 0.048536848487985465], [-1.4392217937862857, 0.6802006022124918, 0.39393401095936664, -0.9408639600006308, 1.2434210491691648, 0.11578727618242052, -1.024996216835058, 1.6785474810818035, -0.6106414046512388, -1.2999984850490414, -0.26420758532475286, -0.415265763365291, -0.5535552404460754, -0.20841650074337004, 1.5651573190662456, 2.086334238083272, -0.474083967654543, -1.084661526373959, 0.6560042827071383, -1.3871901718516624, -0.24283430416131804, -0.5108138951518846, 1.3304444073456776, -1.690224965386932, 0.7669747824009857, 2.020321486026368, -0.6403550804885751, 0.07848739824758677, 1.2346342311189071, -1.1215764018128271, 2.864029198131766, 0.185371503485548], [-1.2170691240063904, 1.270200011791255, 0.2302809786796516, -0.247185970471007, -1.3966270823858395, -0.10745742969224735, -0.748890764486357, -0.1226930069499708, -0.3155083368316857, 1.1531968223971576, -0.3845168338764116, -1.2145451731615091, -0.3265745082915637, -0.297107802451031, -1.2612832594560903, -1.386283498817448, 0.5306670728656099, -0.8155271533061873, 0.4890005627294077, -0.9502798472274838, 0.7301645309977686, 0.6224800745915897, -1.2867086283199212, 0.5138341606214654, -2.552093806823091, -1.0080191723570076, -0.39055292781233625, -0.741886018488434, -0.8529472130830144, -0.2518307511493278, -0.4976086481580281, -0.7105414981113436], [-0.23199134518757833, 1.58406962925026, -1.2075263631967672, -2.086120111770107, -0.4665614825807965, -0.7821058364427632, -0.6104153500093171, -0.11824147374893895, -0.06659066399625767, -1.9914657062718975, 1.121508811465096, -1.0762581165197216, 0.5846522720846818, -0.3741773358979624, 0.5960900193699876, -1.1486848350835923, 0.16519354545207207, 0.2462072651451211, -0.3036373124596814, -0.37011176880107854, -0.612294542776691, -1.0790505111418114, -1.1251990926149618, 0.17761980694924792, 1.0662762360261357, 1.446964176857466, -0.928845296726794, 0.9673015190774826, -0.9105497721268476, -0.3358871813514904, 2.1364877825833184, -1.6860375606859468], [-0.6877931325016207, -0.7668355093032386, 0.6847281915495345, 0.17871132094583678, -0.9648397449080639, -0.3078455722060709, 0.8165521568367407, 1.22543975980128, -0.15497323848934097, 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-0.15962622075822094, 0.35108933678952436, 0.18291744250990447, 1.286143760374327, -0.7297051853488841, 1.6461359012022563, 2.2988507544636], [0.457606840957094, -1.5172136407439718, -1.28360503563569, -0.4624412062004748, 1.220961127831674, -0.33205002855876703, 0.37605021082859313, 0.1842997770462265, -0.2721791722475282, 0.8738702762899054, 1.037668078466411, 0.6621091313754143, 0.6079967624369228, 0.233802881874962, 0.5058030616907334, 0.6805202709654355, -1.1651098871058663, 0.2801285474439017, -1.2705865118839685, -0.05280297226467606, -0.35729309265559034, 0.5281089412902853, -0.3599562446280008, -0.20734872960897693, -0.33504065200972055, -0.4054985328257788, 0.7165321215193505, -0.22148409212264614, 0.25783144748571074, -0.9952954318984449, 2.15884556545617, -0.22598100847870456], [-1.2251816564130225, -1.31614462426175, -1.1268457916840322, -0.8383861326915769, 0.8680647544269458, 0.5565860474135593, 1.0370603205959381, 1.021127708683925, 0.8303778522612429, -0.43589211800235095, -1.4308491099808471, 0.639161248568881, -0.6489076187097301, 0.8100740214658577, 1.5191187111498572, 0.7737469069614498, 1.1675900973147646, 0.3918526917394072, 0.508635885948293, -0.06777679011679204, -0.655069525923777, -1.709993462379751, -0.5875608159909218, 2.1728926643319255, -0.15782936664329084, 1.1836913026748335, 2.1417562645096653, -0.5287324189142008, -0.18670352607646992, 1.1372276147934381, 0.07905602332850292, -1.0546948167582941]]}, \"v\": {\"shape\": [8, 32], \"truncated\": false, \"values\": [[-0.9871834738970214, -0.8353664223222018, 1.2568116022687381, -1.3195644131868456, -0.08708693554974885, -0.36795096877090483, 0.23873776693923549, -1.3891903872381737, -0.5296779404636476, -0.23832051681026423, -0.9749775762632797, -2.019731962961505, 1.3643927976372212, -0.3005655519229637, 0.04692059007780266, -1.3994623465451406, -0.26452791613590815, 0.6529610488531583, -1.1123169926677172, 1.5891707724599657, 1.5850990996063903, 1.49442886700177, -0.370205325994101, -0.47986388437929345, 0.8980539617189371, 0.11776391601792285, -0.10326196329481263, 0.6083436318160872, 0.2856179469619062, 0.42489009949628626, 0.07993575284043423, 0.9715880578621124], [-1.1986918048969228, 0.2178502789780811, -0.20464048000583546, -0.13741424588059534, 0.7500787568813186, -0.6386207947331053, 1.7244932091190477, 0.29552258441013846, 0.9166737428542806, 0.9927860350337918, 1.1747698824887267, 0.18505649138817523, -1.3998766301833554, 0.00451838096427443, 1.6128970513368481, -0.4242866472894959, 0.20670578601752582, -0.7756296695568882, -0.5935417949501957, 1.2714137995729191, -1.1022036127028885, -0.6587032757584876, -0.1155695321111165, -0.7174421226298585, -0.898008879959124, 1.6107221236381615, 0.5508072599521848, 1.3101017575414085, -0.23519542756337028, 0.1919095865606655, -0.3286743464674651, -0.2229314701586826], [0.871068191925532, -0.11547090310742421, -0.9314105126350516, 1.0836465635869388, 2.5132927352085064, -0.8446754421730703, -0.4711068593558731, -0.2654471281155153, -0.18076391862519944, 0.2745198218315799, 0.3141273244725492, -0.2698559539235096, 0.41502153311996265, -0.4369726449493081, -2.0696389983762926, 0.44440214596642613, 0.14286303561757874, -0.6132393438218997, 0.5757802278319596, -1.67998503896808, 1.1028212547261307, -0.4530651954317401, -0.2372658352638346, 1.2288308791713443, -1.7052127632164724, 0.2856008228316298, 1.3022092845940048, 0.034983730318305435, -0.3688451097749284, -0.01948036062310023, -0.5155289888642857, 1.0174087742979008], [0.6825537076831522, 0.7583351570205299, 0.2750346381467359, -0.262131079962963, 0.22455743923027635, 1.0355943123160056, -0.04403588160441519, 1.2363354520633418, 0.5643066264511769, 1.2354788287331375, 0.4407563960261554, -0.3911827513207477, -0.4488581391664718, -1.0263158989758694, 0.8478239868162505, -2.1126500498761938, 0.8236233022742843, 1.2095840092825945, 0.4811762043881711, -0.8571031004012034, -0.15487321188888165, -0.03868710358509449, 0.5081937004824254, 0.9312044959891596, 1.5092369305251723, 0.9349249110161736, 0.39118845130880525, 1.3455254724152041, -0.3685849287493525, 0.5364809806140909, -0.4127503450515353, -0.3963260529404407], [0.0864394848004402, -0.781546274239926, -0.4826761417303327, 0.41371033990382244, -2.2239097884482817, -0.2520476552198445, -0.13188241941887102, -0.8132156205073131, 1.2755224837879704, -1.0766347361499102, -0.5762956459322262, 0.4029510206202444, -0.3227964232519255, -1.1307970334380144, 0.3362641280059089, 0.39621063875723095, -0.31262662044108275, -0.0006027574781092043, -1.1714150446631024, 0.5553173548387074, -0.26300725224560423, 1.1448696701308214, 0.6942440334499579, 0.03550335470115636, 2.3119086546857934, -0.2762049987422564, -0.06360889250948695, -1.6661431594292735, -0.5374136237191696, 0.3844016512296301, 2.2064152870228777, -0.5736742859826971], [-0.857770933490045, -0.18983739638068223, 0.6227820996336637, 2.0373716456791486, 3.0834733848485283, 0.5907824294400266, -0.27914845191586934, 0.2851128979362026, 0.6586692682568324, -0.2981139097940719, 1.357729168307185, -0.8036293162960297, 0.03055558021814941, -1.7724054105115061, -1.7445276055672283, 0.7530287745032027, 0.7434243053315246, -0.6123115437863614, 0.026951138610223666, 1.4827758166018623, -0.6930812003655916, -0.18804797895065184, 0.24485871140851256, -0.282358936685658, -0.2222373554926694, -1.1650130720803562, -1.3618942319492875, -0.39966198462682373, 0.599979440431969, 2.8449464655935524, 0.26324602224726734, 0.9928265308616021], [1.5225359201787156, -1.1572650226930903, 0.9210369477307075, -0.9464334345231947, -0.8318289808207194, -0.438146839105129, -0.044039984801569856, 0.9038658611141022, -1.424446594106753, -0.7093306211795107, -0.09063497929323405, -0.24329834038317788, 0.7235950542165019, 0.21206206520140308, -0.924371864029957, -0.5967211909151534, -0.41399886494038723, -1.6821932834041846, 0.3479542834808341, 1.2471016294648472, -1.4984121179324597, 0.1641126022785863, -0.4092388622019256, -1.4426116631272192, 0.4223444689546868, -0.16204785679401176, -0.1627081608634382, 3.1600393765755164, -0.31669857438322085, 2.1321581234157603, 0.3435896038779786, 1.1451405615754295], [-0.5891965141714894, 0.14053127519022385, -0.6742063852330489, -0.1839616670877003, -1.1943775763224338, -0.3859205951537836, 1.4306697800155763, 1.0347478781151422, -0.3693646716643041, -0.6047768648148218, 0.29178955388914746, -1.6760604598443096, 0.7558866940130254, -0.5176802388615706, 0.3720540644527708, -0.41538237304297126, 0.28684392766185857, 1.057987971489257, 0.9747300306155051, -0.8987738972121889, 0.12603534237467212, 0.44565480999464746, -0.2962286501499274, -1.102244343800442, 1.2304366585319988, -1.2227791886365296, 0.36637584936449175, 0.15593799547305698, -1.7834074293411806, 0.4350024318829489, 0.7612688469355076, 1.118936499061391]]}}", "witness_dims": "{\"M\": 4, \"L\": 8, \"D\": 32}", "numerically_observable": true}
{"family": "reduction", "bug_class": "race", "correct_name": "row_max", "buggy_name": "row_sum_race", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_max(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), float('-inf'), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=float('-inf'))\n        acc = tl.maximum(acc, v)\n    tl.store(out_ptr + row, tl.max(acc, axis=0))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = 1\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_sum_race(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.zeros((BLOCK,), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        acc += v\n    prev = tl.load(out_ptr)\n    tl.store(out_ptr, prev + tl.sum(acc, axis=0))", "why_standard_misses": "on real hardware the lost update is intermittent; a single allclose run sees it only sometimes", "witness_inputs": "{\"x\": {\"shape\": [4, 32], \"truncated\": false, \"values\": [[0.9323224351204542, -0.13484240850688187, -1.0977711087115172, 1.2093136358526926, -1.5200609774258935, -0.3659055784186133, 0.08753656217963342, -0.673525657000616, -0.31220063548687593, 0.6517512317274256, 0.10188336399475949, 2.1183280668541165, -0.1747104908892027, -0.05302204609851407, 1.1776554100520484, 1.034069668664329, 1.3570641388632136, -0.26345967846302504, 0.6563534008927115, -1.0510361039263771, -0.2951569873791522, -0.6036145420186865, 0.4275727371703606, 1.164091172456542, -0.18349346919422196, -0.06950722813263917, 0.9665602467906304, -0.6179201120759003, 1.307118331059199, -1.809250277245433, -0.24609517424533933, 0.047437465889070246], [-0.1726226634799063, -0.4265367270080289, -0.8613653826306371, -1.884530122726135, -0.842549971820494, 0.4946735479336724, 0.4465705367621375, 1.85655320464552, 0.7426474381606197, 1.6626073177772, -0.7445255020708731, -0.8749235310133816, -0.1406877389606945, 0.4921162579956519, -0.23537017889100362, -0.2329928411829563, 1.0203585485236448, -0.3950961781815714, 1.586702826547813, 0.7790573295349854, 0.6084367506154511, -0.7746609271150169, 0.5145944304272745, 0.30077846461329444, 1.0300494046122595, -0.38908207485805274, 1.1903487622827287, -2.3898260878140896, -0.22780056268989937, 1.780801496873732, 0.052726437928369584, -0.2905865934347286], [1.5681129649560095, -0.34023019162555135, -0.590480507527205, 0.3952876666332603, 0.41516876928919283, 0.3747274728808734, -0.6381902366431598, -0.4137973997801163, -0.38841359754271754, 0.9259711547147788, -0.5889466811888183, -0.131217053696824, 0.00859743441700256, 0.12076421285922352, 0.23244373318601652, 0.12115874783464392, 0.7007774085680416, -1.1021614558814128, -0.20761115023330756, 1.0637356081910359, 0.4318807786996173, 0.5185060470598175, -0.12765925263970465, 0.0023738622684158404, 0.32685676241280304, 1.574304297758674, -0.497854771468547, 1.1708647780992363, -1.1308104177840286, -0.5076025950103698, 0.3658925302392737, 0.11861084275632296], [-0.7123668701917418, 0.15577888425550526, 1.376028723925904, -0.8521657544163167, -0.9913974466747576, -0.6171660403968796, 0.36085432621749663, 0.725788747445546, 0.7048039780615126, 0.856549025221355, 1.1007333725162887, -0.5368462420915631, 0.4897982425989597, 1.9345120072465691, 0.6114975628959227, 2.545833547596705, 0.8446100794186416, -0.4976219513230361, -0.6579083416586656, 0.15435453835917065, -1.2352837415993694, -1.5907987411963338, -1.3607153546827384, 0.4951250366915605, -1.5295864071475327, 0.02331219452117253, 1.5065421776698205, -1.0374513272097987, 0.6412381170410911, 1.4182025956774233, 0.4869832493833102, -1.187126614866286]]}, \"w\": {\"shape\": [32], \"truncated\": false, \"values\": [-0.5977878136525421, 0.5499482947031736, -1.282288774354227, -2.0776904842464647, 2.061194735710628, -0.5525172695521284, 0.5098670391746202, -1.363457812071284, -0.19746682414381686, 1.1420645413492911, 0.6255783450063146, -0.061071397736976014, -0.8579834503967044, 1.983500446602315, -0.06843040976465128, -1.954830554634629, 1.0475056154390079, -1.611744070743091, -0.17456089960628418, -0.015990131632859814, -0.9816276242759144, 0.18854014565014418, -0.4928272722487404, 0.5059976051141007, 0.8652126974567892, 0.4340038332999275, 0.2040632519731441, -0.5270238182528804, 1.0758099641593462, -0.6375573748121397, 1.716919815122407, 0.08713222254118819]}, \"b\": {\"shape\": [32], \"truncated\": false, \"values\": [2.0350573599285773, -0.16991243315971818, -0.20766799832413915, 0.42743737204579724, 0.6971226418809447, 1.4539900715632597, 0.1849208603294952, 0.701146603857423, 0.6025765208327771, -0.8487943832250671, 0.4448961180210981, -1.4012743322129773, -0.6757868015068886, -0.223349621952516, 1.38410819746911, 0.04124791968879348, 1.10614562019248, -0.10658197180618174, 0.8128409688341192, -1.3263767409501788, 0.32066904725723755, -0.5203186214933955, 0.6040014181673045, -0.5102548016749502, -1.4045173362952923, -1.155640456085217, 0.6852226947571901, -0.5076807514417746, 0.2555611847109906, -1.8056237695142763, 0.33995212125650787, -0.012663061533244438]}}", "witness_dims": "{\"M\": 4, \"N\": 32}", "numerically_observable": true}
{"family": "layernorm", "bug_class": "race", "correct_name": "layernorm", "buggy_name": "layernorm_race_stats", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer w_ptr = N\n# litmus: buffer b_ptr = N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef layernorm(x_ptr, w_ptr, b_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    s1 = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        s1 += tl.sum(v, axis=0)\n    mean = s1 / N\n    s2 = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        d = tl.where(mask, v - mean, 0.0)\n        s2 += tl.sum(d * d, axis=0)\n    var = s2 / N\n    rstd = 1.0 / tl.sqrt(var + 1e-5)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        w = tl.load(w_ptr + cols, mask=mask, other=0.0)\n        b = tl.load(b_ptr + cols, mask=mask, other=0.0)\n        tl.store(out_ptr + row * N + cols, (v - mean) * rstd * w + b, mask=mask)", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer w_ptr = N\n# litmus: buffer b_ptr = N\n# litmus: buffer out_ptr = M*N\n# litmus: buffer stats_ptr = 2\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef layernorm_race(x_ptr, w_ptr, b_ptr, out_ptr, stats_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    s1 = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        s1 += tl.sum(v, axis=0)\n    mean = s1 / N\n    s2 = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        d = tl.where(mask, v - mean, 0.0)\n        s2 += tl.sum(d * d, axis=0)\n    var = s2 / N\n    tl.store(stats_ptr + 0, mean)\n    tl.store(stats_ptr + 1, var)\n    mean = tl.load(stats_ptr + 0)\n    var = tl.load(stats_ptr + 1)\n    rstd = 1.0 / tl.sqrt(var + 1e-5)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        w = tl.load(w_ptr + cols, mask=mask, other=0.0)\n        b = tl.load(b_ptr + cols, mask=mask, other=0.0)\n        tl.store(out_ptr + row * N + cols, (v - mean) * rstd * w + b, mask=mask)", "why_standard_misses": "rows of i.i.d. noise have near-identical statistics, so reading another row's mean and variance barely changes the output", "witness_inputs": "{\"x\": {\"shape\": [4, 32], \"truncated\": false, \"values\": [[-0.7111066620607831, -0.18152747526685256, -0.5776135416552802, -0.1570444641441432, 1.023144014263097, -0.6279538720442022, -0.5224700162677491, 1.964888119715187, -2.007477339053849, -0.6355140596028792, 0.8284850190307785, -0.5158542499703735, -0.491047728186838, -1.7519032811239368, -1.914127349116291, 1.1443453419182168, 1.6512646699514324, 0.29142250799284164, -0.7206785692962974, -1.5410245016803001, -0.1884183002862263, 0.2567322687087859, -1.899208717879165, 0.4581405355649837, -0.46190139474424924, 1.405363499223668, 0.5235088198805894, 0.7185388800840798, -0.21640862091288507, -0.5772274719226567, -0.8631238077255025, 1.335149077344922], [0.5828965688072903, 0.02813924091965331, -0.1406443203806588, -0.16346815064781, 1.0143379657456404, 1.322055361650601, 1.5209658797118788, -1.7404112286296933, 0.22381979115666684, -1.7604352767783027, -0.16156275348350616, 0.545279319604191, -0.2787937046284972, -0.14622283971200487, 0.4428911074843226, 1.3064789510512147, -0.3665770754751895, 0.7538101496800835, -1.0994780434653573, -0.6653173099696014, 0.9311209649118, 0.701942432373225, -0.44658977111706105, 0.7510301668553768, -0.7326394147754076, -0.7063414354751946, 1.1229209699055602, -0.8072304779271209, -0.6505212369385155, -0.3125727298378464, 0.4255054706313187, 0.19541382934304083], [0.6651080120448106, 0.5034166659467222, 1.1180498251819484, -0.68303728113005, -0.21848139512982861, -0.4362856938036379, 0.5209084801405685, -0.9813577295719307, 0.18774118368828754, 0.22241416956921406, -0.31734977936208103, -3.2626006044352125, -0.8299346800329955, 1.6903754870539969, 0.3523165962048857, -1.259681927826936, -0.8835992237996873, -1.088400052686317, -1.8053750474611139, 0.9817007125414718, -0.029858451923118867, 0.08927106978214805, -0.05958513278465121, -0.37453947860340325, -0.6761206382004367, 0.2807316073833739, -1.0812676313359173, 0.5159749868460862, -2.0842284526502053, -0.7994430845937481, 0.8989409492602084, -0.704714560706215], [0.4221016244096251, -0.24137347426151173, 0.16192557678136812, 0.05905856261872254, 0.2715339168990874, 0.698816945496721, 0.4761063287800504, 0.18356014513588498, 1.1168805057105133, -0.037990541793860855, -0.7330805465870234, 1.1212281151200858, -1.0391234332791206, 1.194393660228538, 0.9906633124885316, 0.2008768535262879, -1.2557503915994408, -0.47911304654565706, -0.46559060580627704, 1.0097670348922356, -1.1819307735551194, -1.736502402089026, 1.4272155909640265, 0.08807459458471478, -2.4598703184629467, 0.8749321837332923, -0.7283130354977287, 1.0671424420630176, -0.816813014443165, -0.13375167926066417, 0.15135763396958035, -0.1915071411586796]]}, \"w\": {\"shape\": [32], \"truncated\": false, \"values\": [-1.4369850476607804, 0.9505636562188045, -0.2914108003493596, 0.6375240743026724, -0.000811902230876507, 0.49992314539077104, 1.6070034094602563, -2.195877402607221, -0.000893032308986645, -0.6639959220467672, -0.3017111410799019, -0.9742216383431987, 0.21473741641546262, 0.6387917891186016, -0.7795586906916712, -1.1938902047482707, 0.07173229161509213, 0.3277765114169412, -1.4980287526316596, 0.9049194050593735, -1.4839598981990128, 0.7924126698080183, -1.55577180292839, -2.134198113668178, 0.19611532354077255, -0.10662651393379763, 0.23540069809580239, 1.7927786461531043, -1.2602559242286895, 0.5413488234875216, 0.9928153256849107, -1.3156365519275874]}, \"b\": {\"shape\": [32], \"truncated\": false, \"values\": [0.0978678631700693, -1.5005114069098986, 0.3660979843404614, 1.4282581482609957, -0.38559780018130957, -1.2514908975652186, -0.2746253233315594, -0.3064147427576885, -0.12454477748489119, 0.5165554303315025, -0.30547756863900505, -2.4390355924437133, -0.667813573672545, 0.8870430252850763, 1.021226220546675, 1.0246478832438877, -0.859233406949938, -1.0555726300889476, 1.4505716312950572, 0.6667900698355521, 1.515222394691568, -0.6088536343986253, 0.34601494177355213, 0.8533521567032677, 0.6426205339579087, 2.3933119283317623, -1.6816710703305102, -0.2644240676321402, 0.7677252956834795, -1.946470068867866, -0.041458201274717256, -1.9470079518823284]}}", "witness_dims": "{\"M\": 4, \"N\": 32, \"S\": 32}", "numerically_observable": true}
{"family": "reduction", "bug_class": "race", "correct_name": "row_max", "buggy_name": "row_sum_barrier", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_max(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), float('-inf'), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=float('-inf'))\n        acc = tl.maximum(acc, v)\n    tl.store(out_ptr + row, tl.max(acc, axis=0))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_sum_barrier(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.zeros((BLOCK,), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        acc += v\n    if tl.arange(0, BLOCK)[0] < N:\n        tl.debug_barrier()\n    tl.store(out_ptr + row, tl.sum(acc, axis=0))", "why_standard_misses": "divergent barriers produce no numerical error at all until the schedule changes -- they are invisible to any output comparison", "witness_inputs": "", "witness_dims": "", "numerically_observable": false}
{"family": "matmul", "bug_class": "dtype_promotion", "correct_name": "matmul_fp16", "buggy_name": "matmul_fp16_acc16", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK_M = 32\n# litmus: constexpr BLOCK_N = 32\n# litmus: constexpr BLOCK_K = 32\n# litmus: buffer a_ptr = M*K\n# litmus: buffer b_ptr = K*N\n# litmus: buffer c_ptr = M*N\n# litmus: grid = cdiv(M, BLOCK_M), cdiv(N, BLOCK_N)\n\n@triton.jit\ndef matmul(a_ptr, b_ptr, c_ptr, M, N, K,\n           BLOCK_M: tl.constexpr, BLOCK_N: tl.constexpr, BLOCK_K: tl.constexpr):\n    pm = tl.program_id(0)\n    pn = tl.program_id(1)\n    offs_m = pm * BLOCK_M + tl.arange(0, BLOCK_M)\n    offs_n = pn * BLOCK_N + tl.arange(0, BLOCK_N)\n    acc = tl.zeros((BLOCK_M, BLOCK_N), dtype=tl.float32)\n    for k in range(0, tl.cdiv(K, BLOCK_K)):\n        offs_k = k * BLOCK_K + tl.arange(0, BLOCK_K)\n        a = tl.load(a_ptr + offs_m[:, None] * K + offs_k[None, :],\n                    mask=(offs_m[:, None] < M) & (offs_k[None, :] < K), other=0.0)\n        b = tl.load(b_ptr + offs_k[:, None] * N + offs_n[None, :],\n                    mask=(offs_k[:, None] < K) & (offs_n[None, :] < N), other=0.0)\n        acc += tl.dot(a, b)\n    tl.store(c_ptr + offs_m[:, None] * N + offs_n[None, :], acc,\n             mask=(offs_m[:, None] < M) & (offs_n[None, :] < N))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK_M = 32\n# litmus: constexpr BLOCK_N = 32\n# litmus: constexpr BLOCK_K = 32\n# litmus: buffer a_ptr = M*K\n# litmus: buffer b_ptr = K*N\n# litmus: buffer c_ptr = M*N\n# litmus: grid = cdiv(M, BLOCK_M), cdiv(N, BLOCK_N)\n\n@triton.jit\ndef matmul(a_ptr, b_ptr, c_ptr, M, N, K,\n           BLOCK_M: tl.constexpr, BLOCK_N: tl.constexpr, BLOCK_K: tl.constexpr):\n    pm = tl.program_id(0)\n    pn = tl.program_id(1)\n    offs_m = pm * BLOCK_M + tl.arange(0, BLOCK_M)\n    offs_n = pn * BLOCK_N + tl.arange(0, BLOCK_N)\n    acc = tl.zeros((BLOCK_M, BLOCK_N), dtype=tl.float16)\n    for k in range(0, tl.cdiv(K, BLOCK_K)):\n        offs_k = k * BLOCK_K + tl.arange(0, BLOCK_K)\n        a = tl.load(a_ptr + offs_m[:, None] * K + offs_k[None, :],\n                    mask=(offs_m[:, None] < M) & (offs_k[None, :] < K), other=0.0)\n        b = tl.load(b_ptr + offs_k[:, None] * N + offs_n[None, :],\n                    mask=(offs_k[:, None] < K) & (offs_n[None, :] < N), other=0.0)\n        acc += tl.dot(a, b)\n    tl.store(c_ptr + offs_m[:, None] * N + offs_n[None, :], acc,\n             mask=(offs_m[:, None] < M) & (offs_n[None, :] < N))", "why_standard_misses": "at K=512 with values in [0,1) the fp16 accumulator has not yet stagnated; the error stays under rtol=1e-2", "witness_inputs": "{\"a\": {\"shape\": [32, 2048], \"truncated\": true, \"values\": [3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 3.4, 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"numerically_observable": true}
{"family": "reduction", "bug_class": "dtype_promotion", "correct_name": "row_max", "buggy_name": "row_sum_fp16_acc", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_max(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), float('-inf'), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=float('-inf'))\n        acc = tl.maximum(acc, v)\n    tl.store(out_ptr + row, tl.max(acc, axis=0))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_reduce(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.zeros((BLOCK,), dtype=tl.float16)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        acc += v\n    tl.store(out_ptr + row, tl.sum(acc, axis=0))", "why_standard_misses": "an fp16 accumulator stagnates above ~2048 and overflows above 65504; with N=512 and values in [0,1) the running total only reaches about 256", "witness_inputs": "{\"x\": {\"shape\": [2, 1024], \"truncated\": false, \"values\": [[100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 100.0, 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"witness_dims": "{\"M\": 2, \"N\": 1024, \"S\": 1024}", "numerically_observable": true}
{"family": "reduction", "bug_class": "stride", "correct_name": "row_max", "buggy_name": "row_sum_wrong_stride", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_max(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.full((BLOCK,), float('-inf'), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=float('-inf'))\n        acc = tl.maximum(acc, v)\n    tl.store(out_ptr + row, tl.max(acc, axis=0))", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer out_ptr = M\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef row_reduce(x_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    acc = tl.zeros((BLOCK,), dtype=tl.float32)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=0.0)\n        acc += v\n    tl.store(out_ptr + row, tl.sum(acc, axis=0))", "why_standard_misses": "benchmarks always pass contiguous tensors, where the row stride equals the row width and the bug is a no-op", "witness_inputs": "{\"x\": {\"shape\": [3, 40], \"truncated\": false, \"values\": [[-0.7111066620607831, -0.18152747526685256, -0.5776135416552802, -0.1570444641441432, 1.023144014263097, -0.6279538720442022, -0.5224700162677491, 1.964888119715187, -2.007477339053849, -0.6355140596028792, 0.8284850190307785, -0.5158542499703735, -0.491047728186838, -1.7519032811239368, -1.914127349116291, 1.1443453419182168, 1.6512646699514324, 0.29142250799284164, -0.7206785692962974, -1.5410245016803001, -0.1884183002862263, 0.2567322687087859, -1.899208717879165, 0.4581405355649837, -0.46190139474424924, 1.405363499223668, 0.5235088198805894, 0.7185388800840798, -0.21640862091288507, -0.5772274719226567, -0.8631238077255025, 1.335149077344922, 0.5828965688072903, 0.02813924091965331, -0.1406443203806588, -0.16346815064781, 1.0143379657456404, 1.322055361650601, 1.5209658797118788, -1.7404112286296933], [0.22381979115666684, -1.7604352767783027, -0.16156275348350616, 0.545279319604191, -0.2787937046284972, -0.14622283971200487, 0.4428911074843226, 1.3064789510512147, -0.3665770754751895, 0.7538101496800835, -1.0994780434653573, -0.6653173099696014, 0.9311209649118, 0.701942432373225, -0.44658977111706105, 0.7510301668553768, -0.7326394147754076, -0.7063414354751946, 1.1229209699055602, -0.8072304779271209, -0.6505212369385155, -0.3125727298378464, 0.4255054706313187, 0.19541382934304083, 0.6651080120448106, 0.5034166659467222, 1.1180498251819484, -0.68303728113005, -0.21848139512982861, -0.4362856938036379, 0.5209084801405685, -0.9813577295719307, 0.18774118368828754, 0.22241416956921406, -0.31734977936208103, -3.2626006044352125, -0.8299346800329955, 1.6903754870539969, 0.3523165962048857, -1.259681927826936], [-0.8835992237996873, -1.088400052686317, -1.8053750474611139, 0.9817007125414718, -0.029858451923118867, 0.08927106978214805, -0.05958513278465121, -0.37453947860340325, -0.6761206382004367, 0.2807316073833739, -1.0812676313359173, 0.5159749868460862, -2.0842284526502053, -0.7994430845937481, 0.8989409492602084, -0.704714560706215, 0.4221016244096251, -0.24137347426151173, 0.16192557678136812, 0.05905856261872254, 0.2715339168990874, 0.698816945496721, 0.4761063287800504, 0.18356014513588498, 1.1168805057105133, -0.037990541793860855, -0.7330805465870234, 1.1212281151200858, -1.0391234332791206, 1.194393660228538, 0.9906633124885316, 0.2008768535262879, -1.2557503915994408, -0.47911304654565706, -0.46559060580627704, 1.0097670348922356, -1.1819307735551194, -1.736502402089026, 1.4272155909640265, 0.08807459458471478]]}, \"w\": {\"shape\": [32], \"truncated\": false, \"values\": [-2.4598703184629467, 0.8749321837332923, -0.7283130354977287, 1.0671424420630176, -0.816813014443165, -0.13375167926066417, 0.15135763396958035, -0.1915071411586796, -1.4369850476607804, 0.9505636562188045, -0.2914108003493596, 0.6375240743026724, -0.000811902230876507, 0.49992314539077104, 1.6070034094602563, -2.195877402607221, -0.000893032308986645, -0.6639959220467672, -0.3017111410799019, -0.9742216383431987, 0.21473741641546262, 0.6387917891186016, -0.7795586906916712, -1.1938902047482707, 0.07173229161509213, 0.3277765114169412, -1.4980287526316596, 0.9049194050593735, -1.4839598981990128, 0.7924126698080183, -1.55577180292839, -2.134198113668178]}, \"b\": {\"shape\": [32], \"truncated\": false, \"values\": [0.19611532354077255, -0.10662651393379763, 0.23540069809580239, 1.7927786461531043, -1.2602559242286895, 0.5413488234875216, 0.9928153256849107, -1.3156365519275874, 0.0978678631700693, -1.5005114069098986, 0.3660979843404614, 1.4282581482609957, -0.38559780018130957, -1.2514908975652186, -0.2746253233315594, -0.3064147427576885, -0.12454477748489119, 0.5165554303315025, -0.30547756863900505, -2.4390355924437133, -0.667813573672545, 0.8870430252850763, 1.021226220546675, 1.0246478832438877, -0.859233406949938, -1.0555726300889476, 1.4505716312950572, 0.6667900698355521, 1.515222394691568, -0.6088536343986253, 0.34601494177355213, 0.8533521567032677]}}", "witness_dims": "{\"M\": 3, \"N\": 32, \"S\": 40}", "numerically_observable": true}
{"family": "layernorm", "bug_class": "stride", "correct_name": "layernorm", "buggy_name": "layernorm_wrong_stride", "correct_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer w_ptr = N\n# litmus: buffer b_ptr = N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef layernorm(x_ptr, w_ptr, b_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    s1 = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        s1 += tl.sum(v, axis=0)\n    mean = s1 / N\n    s2 = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        d = tl.where(mask, v - mean, 0.0)\n        s2 += tl.sum(d * d, axis=0)\n    var = s2 / N\n    rstd = 1.0 / tl.sqrt(var + 1e-5)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * S + cols, mask=mask, other=0.0)\n        w = tl.load(w_ptr + cols, mask=mask, other=0.0)\n        b = tl.load(b_ptr + cols, mask=mask, other=0.0)\n        tl.store(out_ptr + row * N + cols, (v - mean) * rstd * w + b, mask=mask)", "buggy_source": "import triton\nimport triton.language as tl\n\n# litmus: constexpr BLOCK = 32\n# litmus: buffer x_ptr = M*S\n# litmus: buffer w_ptr = N\n# litmus: buffer b_ptr = N\n# litmus: buffer out_ptr = M*N\n# litmus: grid = M\n# litmus: subst S = N + P\n# litmus: sym P in [0, 8]\n\n@triton.jit\ndef layernorm(x_ptr, w_ptr, b_ptr, out_ptr, M, N, S, BLOCK: tl.constexpr):\n    row = tl.program_id(0)\n    s1 = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=0.0)\n        s1 += tl.sum(v, axis=0)\n    mean = s1 / N\n    s2 = 0.0\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=0.0)\n        d = tl.where(mask, v - mean, 0.0)\n        s2 += tl.sum(d * d, axis=0)\n    var = s2 / N\n    rstd = 1.0 / tl.sqrt(var + 1e-5)\n    for start in range(0, N, BLOCK):\n        cols = start + tl.arange(0, BLOCK)\n        mask = cols < N\n        v = tl.load(x_ptr + row * N + cols, mask=mask, other=0.0)\n        w = tl.load(w_ptr + cols, mask=mask, other=0.0)\n        b = tl.load(b_ptr + cols, mask=mask, other=0.0)\n        tl.store(out_ptr + row * N + cols, (v - mean) * rstd * w + b, mask=mask)", "why_standard_misses": "benchmarks always pass contiguous tensors, where the row stride equals the row width and the bug is a no-op", "witness_inputs": "{\"x\": {\"shape\": [3, 40], \"truncated\": false, \"values\": [[-0.7111066620607831, -0.18152747526685256, -0.5776135416552802, -0.1570444641441432, 1.023144014263097, -0.6279538720442022, -0.5224700162677491, 1.964888119715187, -2.007477339053849, -0.6355140596028792, 0.8284850190307785, -0.5158542499703735, -0.491047728186838, -1.7519032811239368, -1.914127349116291, 1.1443453419182168, 1.6512646699514324, 0.29142250799284164, -0.7206785692962974, -1.5410245016803001, -0.1884183002862263, 0.2567322687087859, -1.899208717879165, 0.4581405355649837, -0.46190139474424924, 1.405363499223668, 0.5235088198805894, 0.7185388800840798, -0.21640862091288507, -0.5772274719226567, -0.8631238077255025, 1.335149077344922, 0.5828965688072903, 0.02813924091965331, -0.1406443203806588, -0.16346815064781, 1.0143379657456404, 1.322055361650601, 1.5209658797118788, -1.7404112286296933], [0.22381979115666684, -1.7604352767783027, -0.16156275348350616, 0.545279319604191, -0.2787937046284972, -0.14622283971200487, 0.4428911074843226, 1.3064789510512147, -0.3665770754751895, 0.7538101496800835, -1.0994780434653573, -0.6653173099696014, 0.9311209649118, 0.701942432373225, -0.44658977111706105, 0.7510301668553768, -0.7326394147754076, -0.7063414354751946, 1.1229209699055602, -0.8072304779271209, -0.6505212369385155, -0.3125727298378464, 0.4255054706313187, 0.19541382934304083, 0.6651080120448106, 0.5034166659467222, 1.1180498251819484, -0.68303728113005, -0.21848139512982861, -0.4362856938036379, 0.5209084801405685, -0.9813577295719307, 0.18774118368828754, 0.22241416956921406, -0.31734977936208103, -3.2626006044352125, -0.8299346800329955, 1.6903754870539969, 0.3523165962048857, -1.259681927826936], [-0.8835992237996873, -1.088400052686317, -1.8053750474611139, 0.9817007125414718, -0.029858451923118867, 0.08927106978214805, -0.05958513278465121, -0.37453947860340325, -0.6761206382004367, 0.2807316073833739, -1.0812676313359173, 0.5159749868460862, -2.0842284526502053, -0.7994430845937481, 0.8989409492602084, -0.704714560706215, 0.4221016244096251, -0.24137347426151173, 0.16192557678136812, 0.05905856261872254, 0.2715339168990874, 0.698816945496721, 0.4761063287800504, 0.18356014513588498, 1.1168805057105133, -0.037990541793860855, -0.7330805465870234, 1.1212281151200858, -1.0391234332791206, 1.194393660228538, 0.9906633124885316, 0.2008768535262879, -1.2557503915994408, -0.47911304654565706, -0.46559060580627704, 1.0097670348922356, -1.1819307735551194, -1.736502402089026, 1.4272155909640265, 0.08807459458471478]]}, \"w\": {\"shape\": [32], \"truncated\": false, \"values\": [-2.4598703184629467, 0.8749321837332923, -0.7283130354977287, 1.0671424420630176, -0.816813014443165, -0.13375167926066417, 0.15135763396958035, -0.1915071411586796, -1.4369850476607804, 0.9505636562188045, -0.2914108003493596, 0.6375240743026724, -0.000811902230876507, 0.49992314539077104, 1.6070034094602563, -2.195877402607221, -0.000893032308986645, -0.6639959220467672, -0.3017111410799019, -0.9742216383431987, 0.21473741641546262, 0.6387917891186016, -0.7795586906916712, -1.1938902047482707, 0.07173229161509213, 0.3277765114169412, -1.4980287526316596, 0.9049194050593735, -1.4839598981990128, 0.7924126698080183, -1.55577180292839, -2.134198113668178]}, \"b\": {\"shape\": [32], \"truncated\": false, \"values\": [0.19611532354077255, -0.10662651393379763, 0.23540069809580239, 1.7927786461531043, -1.2602559242286895, 0.5413488234875216, 0.9928153256849107, -1.3156365519275874, 0.0978678631700693, -1.5005114069098986, 0.3660979843404614, 1.4282581482609957, -0.38559780018130957, -1.2514908975652186, -0.2746253233315594, -0.3064147427576885, -0.12454477748489119, 0.5165554303315025, -0.30547756863900505, -2.4390355924437133, -0.667813573672545, 0.8870430252850763, 1.021226220546675, 1.0246478832438877, -0.859233406949938, -1.0555726300889476, 1.4505716312950572, 0.6667900698355521, 1.515222394691568, -0.6088536343986253, 0.34601494177355213, 0.8533521567032677]}}", "witness_dims": "{\"M\": 3, \"N\": 32, \"S\": 40}", "numerically_observable": true}