linux-kernel - Re: [PATCH v4] signal: trace_signal_deliver when signal_group

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Date:   Wed, 24 Apr 2019 15:25:03 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Christian Brauner <christian@...uner.io>
Cc:     Zhenliang Wei <weizhenliang@...wei.com>, ebiederm@...ssion.com,
        colona@...sta.com, akpm@...ux-foundation.org, arnd@...db.de,
        tglx@...utronix.de, deepa.kernel@...il.com,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v4] signal: trace_signal_deliver when signal_group_exit

On 04/24, Christian Brauner wrote:
>
> On Wed, Apr 24, 2019 at 08:52:38PM +0800, Zhenliang Wei wrote:
>
> > Reviewed-by: Oleg Nesterov <oleg@...hat.com>

Yes, but ...

> > Reported-by: kbuild test robot <lkp@...el.com>

Hmm, really?

> > --- 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(SIGKILL, SEND_SIG_NOINFO,
> > +			&sighand->action[signr - 1]);
>
> Hm, sorry for being the really nitpicky person here. Just for the sake
> of consistency how about we do either:
>
> +		trace_signal_deliver(SIGKILL, SEND_SIG_NOINFO,
> +			&sighand->action[SIGKILL - 1]);
>
> or
>
> +		trace_signal_deliver(signr, SEND_SIG_NOINFO,
> +			&sighand->action[signr - 1]);

Agreed!

Oleg.