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gh-151763: Fix OOM cleanup of initial thread state #152165

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gh-151763: Fix OOM cleanup of initial thread state #152165

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6a0e86b
gh-151763: Fix free-threaded OOM cleanup for initial thread state
zainnadeem786 Jun 25, 2026
7a02891
Move interpreter pointer initialization to new_threadstate
zainnadeem786 Jun 25, 2026
9d47a7b
Add comment and NEWS for thread state cleanup fix
zainnadeem786 Jun 25, 2026
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-06-26-00-06-29.gh-issue-151763.pX4fYq.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fixed a possible crash in free-threaded builds when interpreter creation fails
due to memory allocation failure.
3 changes: 3 additions & 0 deletions Python/pystate.c
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Expand Up @@ -1661,6 +1661,9 @@ new_threadstate(PyInterpreterState *interp, int whence)
if (tstate == NULL) {
return NULL;
}
// Set the back-pointer before init_threadstate() so early cleanup can
// recognize the preallocated initial thread state after allocation failures.
tstate->base.interp = interp;
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#ifdef Py_GIL_DISABLED
Py_ssize_t qsbr_idx = _Py_qsbr_reserve(interp);
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