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root_scripts/diag_abi.sh

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+
+python3 << 'PYEOF'
+import torch
+print(f"torch version: {torch.__version__}")
+print(f"CXX11_ABI: {torch._C._GLIBCXX_USE_CXX11_ABI}")
+
+# Check what symbols torch provides
+import subprocess
+# Check the symbol in torch
+result = subprocess.run(
+    ["nm", "-D", torch.__file__.replace("__init__.py", "_C.cpython-311-x86_64-linux-gnu.so")],
+    capture_output=True, text=True
+)
+# Look for c10_cuda_check
+matches = [l for l in result.stdout.split("\n") if "c10_cuda_check" in l]
+print(f"torch c10_cuda_check symbols: {len(matches)}")
+for m in matches[:5]:
+    print(f"  {m}")
+
+# Check flash_attn .so
+import os
+so_path = "/opt/conda/lib/python3.11/site-packages/flash_attn_2_cuda.cpython-311-x86_64-linux-gnu.so"
+if os.path.exists(so_path):
+    result2 = subprocess.run(["nm", "-D", so_path], capture_output=True, text=True)
+    undef = [l for l in result2.stdout.split("\n") if "c10_cuda_check" in l]
+    print(f"\nflash_attn .so c10_cuda_check symbols: {len(undef)}")
+    for m in undef[:5]:
+        print(f"  {m}")
+    
+    # Check CXX11 ABI indicator in the .so
+    abi_check = subprocess.run(["strings", so_path], capture_output=True, text=True)
+    # Look for ABI tag
+    for line in abi_check.stdout.split("\n"):
+        if "cxx11abi" in line.lower() or "GLIBCXX" in line:
+            print(f"SO ABI marker: {line}")
+PYEOF
+