linux-kernel - Re: [PATCH 2/4] posix timers: sigqueue_free: don't free sigqueue if it is queued

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Message-ID: <20080517151347.GA9476@tv-sign.ru>
Date:	Sat, 17 May 2008 19:13:47 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Austin Clements <amdragon+kernelbugzilla@....edu>,
	Ingo Molnar <mingo@...e.hu>, john stultz <johnstul@...ibm.com>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	Roland McGrath <roland@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] posix timers: sigqueue_free: don't free sigqueue if it is queued

On 05/03, Linus Torvalds wrote:
> 
> On Sat, 3 May 2008, Oleg Nesterov wrote:
> > 
> > Note: I am not sure we shouldn't do the opposite, free sigqueue + cancel the
> > pending signal, but this needs some ugly changes. Perhaps we should reconsider
> > this change later. See also http://bugzilla.kernel.org/show_bug.cgi?id=10460
> 
> You know what, I think there might be an even simple solution.
> 
> How about just setting a bit saying it is canceled

Yes, good idea, I'll send the patch in a minute.

But now I see I didn't read your message to the end,

> - and nothing more.
> Then, the dequeue logic can be just taught to ignore those things.

Unless I missed something again, "nothing more" can't work. We still
need this patch (re-sended). We still need to free sigqueue if it is
not queued, and we must not dequeue it if it is queued - otherwise we
will free it along with the new "canceled" bit.

Oleg.

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