Offering: HULK hulk inclusion category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/14165 -------------------------------- 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 cdd34d6e3dd4..7657ddf008ce 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6782,7 +6782,7 @@ 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