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[3.9] gh-112275: Fix HEAD_LOCK deadlock in child process after fork (GH-112336) (#123688) 

HEAD_LOCK is called from _PyEval_ReInitThreads->_PyThreadState_DeleteExcept before _PyRuntimeState_ReInitThreads reinit runtime->interpreters.mutex which might be locked before fork.

(cherry picked from commit 522799a05e)

Co-authored-by: ChuBoning <102216855+ChuBoning@users.noreply.github.com>
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Łukasz Langa 2024-09-04 22:41:03 +02:00 committed by GitHub
parent 9290419492
commit 0152431f17
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2 changed files with 4 additions and 1 deletions
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Misc/NEWS.d/next/Core_and_Builtins/2024-09-04-18-20-11.gh-issue-112275.W_iMiB.rst Normal file
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@ -0,0 +1,3 @@
A deadlock involving ``pystate.c``'s ``HEAD_LOCK`` in ``posixmodule.c``
at fork is now fixed. Patch by ChuBoning based on previous Python 3.12
fix by Victor Stinner.

2
Modules/posixmodule.c
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@ -589,10 +589,10 @@ PyOS_AfterFork_Child(void)
{
_PyRuntimeState *runtime = &_PyRuntime;
_PyGILState_Reinit(runtime);
_PyRuntimeState_ReInitThreads(runtime);
_PyEval_ReInitThreads(runtime);
_PyImport_ReInitLock();
_PySignal_AfterFork();
_PyRuntimeState_ReInitThreads(runtime);
_PyInterpreterState_DeleteExceptMain(runtime);
run_at_forkers(_PyInterpreterState_GET()->after_forkers_child, 0);