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gh-118332: Fix deadlock involving stop the world (#118412)

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Avoid detaching thread state when stopping the world. When re-attaching
the thread state, the thread would attempt to resume the top-most
critical section, which might now be held by a thread paused for our
stop-the-world request.
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Sam Gross 2024-04-30 15:01:28 -04:00 • committed by GitHub
parent 4a1cf66c5c
commit b2c3b70c71
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5 changed files with 96 additions and 7 deletions
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Python/pystate.c
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@ -2238,7 +2238,8 @@ stop_the_world(struct _stoptheworld_state *stw)
}
PyTime_t wait_ns = 1000*1000; // 1ms (arbitrary, may need tuning)
if (PyEvent_WaitTimed(&stw->stop_event, wait_ns)) {
int detach = 0;
if (PyEvent_WaitTimed(&stw->stop_event, wait_ns, detach)) {
assert(stw->thread_countdown == 0);
break;
}