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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cannot safely Py_EndInterpreter in 3.14b1","articleBody":"# Crash report\n\n### What happened?\n\nStack trace:\n```\n#0  tstate_delete_common.constprop.0 (tstate=tstate@entry=0x555555666ca0, release_gil=0) at ../Python/pystate.c:1854\n#1  0x00007ffff78cd341 in zapthreads (interp=0x7ffff74c8010) at ../Python/pystate.c:1915\n#2  PyInterpreterState_Delete (interp=0x7ffff74c8010) at ../Python/pystate.c:1016\n#3  0x00005555555552ef in main () at repro.c:16\n```\n(note the address passed to tstate_delete_common is definitely corrupt, and not the address of any PyThreadState created in this program)\n\nThis was triggered by creating a new PyThreeadState for the interpreter, switching to it, deleting an old thread state for the same interpreter, and then calling Py_EndInterpreter (on the new thread state).\n\nrepro.c:\n\n```c\n#include \u003cPython.h\u003e\n\nint main()\n{\n        Py_Initialize();\n\n        PyThreadState *orig = NULL;\n        PyInterpreterConfig cfg =  _PyInterpreterConfig_INIT;\n        Py_NewInterpreterFromConfig(\u0026orig, \u0026cfg);\n\n        PyThreadState *temp = PyThreadState_New(orig-\u003einterp);\n        PyThreadState_Swap(temp);\n        PyThreadState_Clear(orig);\n        PyThreadState_Delete(orig);\n        Py_EndInterpreter(temp);\n\n        Py_Finalize();\n}\n```\n\nCompiled with `$ gcc -O1 -ggdb  repro.cpp -I/usr/include/python3.14 -lpython3.14`\n\n### CPython versions tested on:\n\n3.14\n\n### Operating systems tested on:\n\nLinux\n\n### Output from running 'python -VV' on the command line:\n\nPython 3.14.0b1 (main, May  8 2025, 08:57:13) [GCC 13.3.0]\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-134145\n* gh-134182\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/b-pass","@type":"Person","name":"b-pass"},"datePublished":"2025-05-17T14:51:28.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/134144/cpython/issues/134144"}