linux-kernel - Re: [PATCH v3] signal: trace_signal_deliver when signal_group

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Date:   Tue, 23 Apr 2019 15:35:53 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     weizhenliang <weizhenliang@...wei.com>
Cc:     "ebiederm@...ssion.com" <ebiederm@...ssion.com>,
        "colona@...sta.com" <colona@...sta.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "christian@...uner.io" <christian@...uner.io>,
        "arnd@...db.de" <arnd@...db.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "deepa.kernel@...il.com" <deepa.kernel@...il.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v3] signal: trace_signal_deliver when signal_group_exit

On 04/23, weizhenliang wrote:
>
> On Mon, Apr 22, 2019 at 11:25 PM Oleg Nesterov <oleg@...hat.com> wrote:
> >On 04/22, Zhenliang Wei wrote:
> >>
> >> --- a/kernel/signal.c
> >> +++ b/kernel/signal.c
> >> @@ -2441,6 +2441,7 @@ 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(SIGKILL, SEND_SIG_NOINFO, SIG_DFL);
> >>  		recalc_sigpending();
> >>  		goto fatal;
> >>  	}
> >
> >Reviewed-by: Oleg Nesterov <oleg@...hat.com>
>
> Last time Oleg suggested using SIG_DFL as the third parameter, but its type is 'void (*)(int)', but not expected 'struct k_sigaction *'.

Yes I misread the signature of TRACE_EVENT(signal_deliver), and I thought you at
least compiled the kernel with your patch applied ;)

> How about
> 	trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO, &sighand->action[signr - 1]);
> ?

sure, this should fix the problem.

Oleg.