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- Prevent perf_sigtrap() from observing an exiting task and warning 

about it
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Merge tag 'perf_urgent_for_v6.16_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fix from Borislav Petkov:

 - Prevent perf_sigtrap() from observing an exiting task and warning
   about it

* tag 'perf_urgent_for_v6.16_rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix WARN in perf_sigtrap()
This commit is contained in:
Linus Torvalds 2025-07-13 10:34:47 -07:00
parent 3f31a806a6 3da6bb4197
commit 0a197b7576
1 changed files with 7 additions and 7 deletions
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14
kernel/events/core.c
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@ -7203,6 +7203,13 @@ void perf_event_wakeup(struct perf_event *event)
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)
return;
/*
* We'd expect this to only occur if the irq_work is delayed and either
* ctx->task or current has changed in the meantime. This can be the
@ -7211,13 +7218,6 @@ static void perf_sigtrap(struct perf_event *event)
if (WARN_ON_ONCE(event->ctx->task != current))
return;
/*
* Both perf_pending_task() and perf_pending_irq() can race with the
* task exiting.
*/
if (current->flags & PF_EXITING)
return;
send_sig_perf((void __user *)event->pending_addr,
event->orig_type, event->attr.sig_data);
}