perf: Ensure swevent hrtimer is properly destroyed

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[ Upstream commit ff5860f508 ]

With the change to hrtimer_try_to_cancel() in
perf_swevent_cancel_hrtimer() it appears possible for the hrtimer to
still be active by the time the event gets freed.

Make sure the event does a full hrtimer_cancel() on the free path by
installing a perf_event::destroy handler.

Fixes: eb3182ef04 ("perf/core: Fix system hang caused by cpu-clock usage")
Reported-by: CyberUnicorns <a101e_iotvul@163.com>
Tested-by: CyberUnicorns <a101e_iotvul@163.com>
Debugged-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Peter Zijlstra 2025-12-20 14:14:41 +01:00 • committed by Greg Kroah-Hartman

parent 088ca99dbb

commit deee9dfb11

1 changed files with 6 additions and 0 deletions

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kernel/events/core.c

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