perf: Fix __perf_event_overflow() vs perf_remove_from_context() race

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[ Upstream commit c9bc1753b3 ]

Make sure that __perf_event_overflow() runs with IRQs disabled for all
possible callchains. Specifically the software events can end up running
it with only preemption disabled.

This opens up a race vs perf_event_exit_event() and friends that will go
and free various things the overflow path expects to be present, like
the BPF program.

Fixes: 592903cdcb ("perf_counter: add an event_list")
Reported-by: Simond Hu <cmdhh1767@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Simond Hu <cmdhh1767@gmail.com>
Link: https://patch.msgid.link/20260224122909.GV1395416@noisy.programming.kicks-ass.net
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Peter Zijlstra 2026-02-24 13:29:09 +01:00 • committed by Greg Kroah-Hartman

parent 367e428512

commit 5c48fdc4b4

1 changed files with 41 additions and 1 deletions

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kernel/events/core.c

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