Message396300
inittab-bug.c uses the Python C API in 3 threads:
* Thread A (init_proc) calls Py_InitializeFromConfig()
* Thread B (run_proc) calls Py_RunMain()
* The main thread (main) calls Py_FinalizeEx()
Problem: the thread B (run_proc) doesn't hold the GIL and so I get a fatal error with Python built in debug mode:
------------
$ gcc inittab-bug.c -ggdb -pthread -lpython3.11d -L. -I. -I Include/
$ PYTHONPATH=$PWD/Lib LD_LIBRARY_PATH=$PWD ./a.out
------ Modules: ------
#0 'posix'
#1 'errno'
#2 'pwd'
----------------------
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Run Python Script
Fatal Python error: _PyMem_DebugMalloc: Python memory allocator called without holding the GIL
Python runtime state: initialized
Thread 0x00007f61ce5c1640 (most recent call first):
<no Python frame>
Abandon (core dumped)
------------
If I remove the thread B (comment the comment), I get a similar error in the main thread which calls Py_FinalizeEx().
Please fix your usage of the GIL. For example, you can try to use:
* https://docs.python.org/dev/c-api/init.html#c.PyGILState_Ensure
* https://docs.python.org/dev/c-api/init.html#c.PyGILState_Release
Usually, Python initialization and Python finalization is done in the same thread, but another thread can use the Python C API if it acquires the GIL using PyGILState_Ensure(). |
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Date |
User |
Action |
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2021-06-21 23:26:13 | vstinner | set | recipients:
+ vstinner, kryheb |
2021-06-21 23:26:12 | vstinner | set | messageid: <1624317972.97.0.540986571164.issue44441@roundup.psfhosted.org> |
2021-06-21 23:26:12 | vstinner | link | issue44441 messages |
2021-06-21 23:26:12 | vstinner | create | |
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