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[SIG-CLOUD-8] posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() #563

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Merged
merged 1 commit into from
Sep 10, 2025
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[SIG-CLOUD-8] posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del() #563

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9 changes: 9 additions & 0 deletions kernel/time/posix-cpu-timers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1122,6 +1122,15 @@ void run_posix_cpu_timers(void)

lockdep_assert_irqs_disabled();

/*
* Ensure that release_task(tsk) can't happen while
* handle_posix_cpu_timers() is running. Otherwise, a concurrent
* posix_cpu_timer_del() may fail to lock_task_sighand(tsk) and
* miss timer->it.cpu.firing != 0.
*/
if (tsk->exit_state)
return;

/*
* The fast path checks that there are no expired thread or thread
* group timers. If that's so, just return.
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