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[3.13] gh-117657: Fix race involving immortalizing objects (GH-119927) (#120005)

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The free-threaded build currently immortalizes objects that use deferred
reference counting (see gh-117783). This typically happens once the
first non-main thread is created, but the behavior can be suppressed for
tests, in subinterpreters, or during a compile() call.

This fixes a race condition involving the tracking of whether the
behavior is suppressed.

(cherry picked from commit 47fb4327b5)
This commit is contained in:
Sam Gross 2024-06-03 18:21:32 -04:00 • committed by GitHub
parent ca37034baa
commit ae705319fc
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9 changed files with 30 additions and 44 deletions
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4
Python/pystate.c
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@ -1583,9 +1583,7 @@ new_threadstate(PyInterpreterState *interp, int whence)
}
else {
#ifdef Py_GIL_DISABLED
if (interp->gc.immortalize.enable_on_thread_created &&
!interp->gc.immortalize.enabled)
{
if (_Py_atomic_load_int(&interp->gc.immortalize) == 0) {
// Immortalize objects marked as using deferred reference counting
// the first time a non-main thread is created.
_PyGC_ImmortalizeDeferredObjects(interp);