linux-kernel - Re: [patch v6 17/20] signal: Queue ignored posixtimers on ignore list

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Message-ID: <ZyfVKmNIhgNBhA7q@pavilion.home>
Date: Sun, 3 Nov 2024 20:55:22 +0100
From: Frederic Weisbecker <frederic@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	John Stultz <jstultz@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: [patch v6 17/20] signal: Queue ignored posixtimers on ignore list

Le Sun, Nov 03, 2024 at 10:44:35AM +0100, Thomas Gleixner a écrit :
> On Sun, Nov 03 2024 at 00:46, Frederic Weisbecker wrote:
> > And what about the other callers of flush_sigqueue_mask()? Such as SIGCONT
> > removed when SIGSTOP arrives? And the reverse as well? This moves the pending
> > timers signals to the ignore list until the signal is unignored, but in that
> > case SIGCONT is not ignored? Or perhaps SIGCONT and SIGSTOP can't be set for
> > posix timers?
> 
> You can set SIGSTOP/CONT on a posix timer. Whether that makes sense or
> not is a different question :)
> 
> Even on current mainline the behaviour is pretty much unspecified. Some
> combinations "work", some not. I just tried out of morbid curiousity. :)

I see.

So probably we shouldn't care too much, right?

> 
> Thanks,
> 
>         tglx
> 
>