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Crash report
What happened?
I'm using ThreadPoolExecutor to write tests for free-threading enabled C extensions.
When running concurrent threads larger than CPython crashes when num_workers, CPython crashes.num_futures >= 2 if the test function is complex enough.
The Python is installed via the following configuration with PyDebug enabled:
./configure --prefix="${PWD}/pydev" \ --enable-ipv6 --with-openssl="$(brew --prefix openssl)" \ --with-system-expat --with-system-libmpdec \ --with-assertions --with-pydebug --with-trace-refs \ --disable-gilfrom concurrent.futures import ThreadPoolExecutor NUM_WORKERS = 32 NUM_FUTURES = 1024 def concurrent_run(func): with ThreadPoolExecutor(max_workers=NUM_WORKERS) as executor: for _ in range(NUM_FUTURES): executor.submit(func) concurrent_run(lambda : None)Python 3.13.0rc2+ experimental free-threading build (heads/3.13:112b1704fa6, Sep 13 2024, 15:34:48) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from concurrent.futures import ThreadPoolExecutor >>> NUM_WORKERS = 32 ... NUM_FUTURES = 1024 ... ... def concurrent_run(func): ... with ThreadPoolExecutor(max_workers=NUM_WORKERS) as executor: ... for _ in range(NUM_FUTURES): ... executor.submit(func) ... >>> concurrent_run(lambda : None) Assertion failed: (value == REFCHAIN_VALUE), function _PyRefchain_Remove, file object.c, line 195. Fatal Python error: Aborted Thread 0x0000000173e2b000 (most recent call first): File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 304 in __enter__ File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 528 in release File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/concurrent/futures/thread.py", line 87 in _worker File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 992 in run File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 1041 in _bootstrap_inner File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 1012 in _bootstrap Thread 0x0000000172e1f000 (most recent call first): File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/concurrent/futures/thread.py", line 89 in _worker File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 992 in run File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 1041 in _bootstrap_inner File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 1012 in _bootstrap Thread 0x0000000171e13000 (most recent call first): File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/concurrent/futures/thread.py", line 89 in _worker File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 992 in run File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 1041 in _bootstrap_inner File "/Users/PanXuehai/Projects/cpython/pydev/lib/python3.13t/threading.py", line 1012 in _bootstrap Current thread 0x0000000170e07000 (most recent call first): Assertion failed: (PyCode_Check(f->f_executable)), function _PyFrame_GetCode, file pycore_frame.h, line 81.CPython versions tested on:
CPython main branch
Operating systems tested on:
macOS
Output from running 'python -VV' on the command line:
Python 3.13.0rc2+ experimental free-threading build (heads/3.13:112b1704fa6, Sep 13 2024, 15:34:48) [Clang 15.0.0 (clang-1500.3.9.4)]
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