linux-kernel - Re: [PATCH/RFC] signal races/bugs, losing TIF

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Message-Id: <1181081720.31677.144.camel@localhost.localdomain>
Date:	Wed, 06 Jun 2007 08:15:20 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH/RFC] signal races/bugs, losing TIF_SIGPENDING and other
	woes

On Tue, 2007-06-05 at 08:52 -0700, Davide Libenzi wrote:
>         if (tsk == current)
>                 recalc_sigpending();
> 
> What can happen, is that a task may notice TIF_SIGPENDING and not find
> a 
> signal once it calls dequeue_signal(), but this is fine as far as
> signalfd 
> goes. This should be OK in general, no? 

What about the code in __dequeue_signal though ? That notifier thing is
used by the DRI though I'm not sure what would happen if it acts on the
wrong task.

Ben.

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