* [PATCH] perf/core: Fix race between perf_event_exit_task and perf_pending_task
@ 2026-04-16 3:34 Luo Gengkun
0 siblings, 0 replies; only message in thread
From: Luo Gengkun @ 2026-04-16 3:34 UTC (permalink / raw)
To: peterz
Cc: mingo, acme, namhyung, mark.rutland, alexander.shishkin, jolsa,
irogers, adrian.hunter, james.clark, elver, dvyukov,
linux-perf-users, linux-kernel
A race condition exists between perf_event_exit_task() and perf_pending_task().
During begin_new_exec(), perf_event_exit_task() may be called, and the
PF_EXITING flag is not set on task. so perf_sigtrap() continues to execute
and triggers WARN_ON_ONCE(event->ctx->task != current).
To fix this problem, also check if the event->ctx->task is TASK_TOMBSTONE.
Fixes: 97ba62b27867 ("perf: Add support for SIGTRAP on perf events")
Signed-off-by: Luo Gengkun <luogengkun2@huawei.com>
---
kernel/events/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 1f5699b339ec..3422900263fa 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7543,7 +7543,7 @@ static void perf_sigtrap(struct perf_event *event)
* Both perf_pending_task() and perf_pending_irq() can race with the
* task exiting.
*/
- if (current->flags & PF_EXITING)
+ if (current->flags & PF_EXITING || event->ctx->task == TASK_TOMBSTONE)
return;
/*
--
2.34.1
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