I am running into crashes when trying to use VS Code to debug some Python code that calls Intel MKL. See this debugpy issue for details: https://github.com/microsoft/debugpy/issues/1987. The VS Code Python debugger developers claim it is not an issue with their debugger, but an issue with one of the libraries being called by minimal reproducible example. I don't believe them, but I am doing my due diligence before reopening the issue, starting with MKL as that's the last deepest DLL in the stack trace.
Steps to reproduce:
1) In conda, install this conda environment file
2) In VS Code, set the interpreter to the newly created environment (Ctrl+Shift+P -> Python: Select Interpreter)
3) In VS Code, create a new Python file with the following code:
import numpy as np
np.cov(np.random.random(size=(50,41)),rowvar=False)
print('hello, world!')4). Attempt to debug the file (Run and Debug side panel -> ▷ Python Debugger: Current File)
Expected behaviour:
The script prints "hello, world!"
Actual behaviour:
The debugpy process crashes. If I attach a C/C++ debugger to the debugpy process, this is the output:
------------------------------------------------------------------------------
You may only use the C/C++ Extension for Visual Studio Code with Visual Studio
Code, Visual Studio or Visual Studio for Mac software to help you develop and
test your applications.
------------------------------------------------------------------------------
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\python.exe'. Symbols loaded.
python.exe (27392): Loaded 'C:\Windows\System32\ntdll.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\kernel32.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\KernelBase.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\ucrtbase.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\python312.dll'. Symbols loaded.
python.exe (27392): Loaded 'C:\Windows\System32\ws2_32.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\vcruntime140.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\version.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\rpcrt4.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\msvcrt.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\bcrypt.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\advapi32.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\sechost.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\zlib.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Windows\System32\umppc20309.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\CsXumd64_20309.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\bcryptprimitives.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\python3.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\_wmi.pyd'.
python.exe (27392): Loaded 'C:\Windows\System32\oleaut32.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\msvcp_win.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\combase.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\propsys.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\vcruntime140_1.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\unicodedata.pyd'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\_socket.pyd'.
python.exe (27392): Loaded 'C:\Windows\System32\IPHLPAPI.DLL'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\select.pyd'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\_queue.pyd'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\_decimal.pyd'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\_ssl.pyd'.
python.exe (27392): Loaded 'C:\Windows\System32\crypt32.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Library\bin\libcrypto-3-x64.dll'. Symbols loaded.
python.exe (27392): Loaded 'C:\Windows\System32\user32.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\win32u.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\gdi32.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\gdi32full.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Library\bin\libssl-3-x64.dll'. Symbols loaded.
python.exe (27392): Loaded 'C:\Windows\System32\imm32.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\pyexpat.pyd'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\libexpat.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\_bz2.pyd'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Library\bin\libbz2.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\_lzma.pyd'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Library\bin\liblzma.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\DLLs\_ctypes.pyd'.
python.exe (27392): Loaded 'C:\Windows\System32\ole32.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Library\bin\ffi-8.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.vscode\extensions\ms-python.debugpy-2025.18.0-win32-x64\bundled\libs\debugpy\_vendored\pydevd\_pydevd_bundle\pydevd_cython.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.vscode\extensions\ms-python.debugpy-2025.18.0-win32-x64\bundled\libs\debugpy\_vendored\pydevd\_pydevd_sys_monitoring\_pydevd_sys_monitoring_cython.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Windows\System32\kernel.appcore.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\uxtheme.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\clbcatq.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\amsi.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\userenv.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\profapi.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\ScriptControl64_20309.dll'.
python.exe (27392): Loaded 'C:\Windows\System32\mswsock.dll'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\core\_multiarray_umath.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\libcblas.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\mkl_rt.2.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\core\_multiarray_tests.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\linalg\_umath_linalg.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\libblas.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\liblapack.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\fft\_pocketfft_internal.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\mtrand.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\bit_generator.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\_common.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\DLLs\_hashlib.pyd'.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\_bounded_integers.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\_mt19937.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\_philox.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\_pcg64.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\_sfc64.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\unimanual\Lib\site-packages\numpy\random\_generator.cp312-win_amd64.pyd'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\mkl_intel_thread.2.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\mkl_core.2.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\mkl_avx2.2.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\mkl_vml_avx2.2.dll'. Module was built without symbols.
python.exe (27392): Loaded 'C:\Users\jmb9770\.conda\envs\test\Library\bin\libiomp5md.dll'. Module was built without symbols.
Exception thrown at 0x00007FFD7E6A5369 (KernelBase.dll) in python.exe: 0xC06D007F: Procedure not found (parameters: 0x0000009D74BECF00).
This screenshot shows the stack trace at the time of the crash:
Note that mkl_intel_thread.2.dll is the last DLL called that's not a Windows DLL (i.e. KernelBase.dll), hence why the debugpy developers think it is the culprit.
Additional info:
The script runs fine run as a normal python script, or debugged with pdb.
Environment info:
mkl Version: 2025.3.0 (packaged by conda-forge, build hac47afa_455)
VS Code Version: 1.107.1 (user setup)
Commit: 994fd12f8d3a5aa16f17d42c041e5809167e845a
Date: 2025-12-17T14:15:14.850Z
Electron: 39.2.3
ElectronBuildId: 12895514
Chromium: 142.0.7444.175
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Windows_NT x64 10.0.19045
Python extension version: 2025.20.1
Python Debugger extension version: 2025.18.0
Python Environments extension version 1.14.0
Pylance extension version: 2025.10.4
Python version: 3.12.12
conda version: 24.7.1
Thanks in advance for any help. Please let me know of any other relevant information that I can provide to help diagnose this.
링크가 복사됨
