On 04/20, Oleg Nesterov wrote:

On 04/20, Zhenliang Wei wrote:

...

--- a/kernel/signal.c +++ b/kernel/signal.c @@ -2441,6 +2441,8 @@ bool get_signal(struct ksignal *ksig) if (signal_group_exit(signal)) { ksig->info.si_signo = signr = SIGKILL; sigdelset(&current->pending.signal, SIGKILL);

• trace_signal_deliver(signr, &ksig->info,
  

• 		&sighand->action[signr - 1]);
  

Well, in this case ksig->info is not fully initialized for TP_STORE_SIGINFO() which reads si_errno/si_code...

How about

trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO, SIG_DFL)

?

We know that action[SIGKILL] must be SIG_DFL.

And SEND_SIG_NOINFO matches the fact that SIGKILL doesn't have any info, collect_signal() sets SI_USER and clears si_errno in this case.

Oleg.

Thank you for your review, I agree with your suggestion, and I will recommit the patch later.

Zhenliang Wei.