linux-kernel - Re: [PATCH] [RFC] fix missed SIGCONT cases

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Message-ID: <Pine.LNX.4.64.0802281238550.3391@jikos.suse.cz>
Date:	Thu, 28 Feb 2008 12:42:07 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Roland McGrath <roland@...hat.com>
cc:	Oleg Nesterov <oleg@...sign.ru>,
	Davide Libenzi <davidel@...ilserver.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC] fix missed SIGCONT cases

On Thu, 28 Feb 2008, Roland McGrath wrote:

> [PATCH] clean up and fix SIGCONT
> This reorganizes some of the signals code, replacing handle_stop_signal()
> with prepare_signal() and finish_signal(), called as a pair before and
> after generating any signal.  The CLD_CONTINUED notification to parent is
> moved into finish_signal(), taking place after the signal is made pending
> and siglock dropped.  This fixes a race where a process waking from SIGCONT
> could resume application code without running its SIGCONT handler first.

Hi Roland,

I haven't tested what is the behavior with my patch, or without any 
patches at all (will do), but with your patch applied, when I run the test 
program under strace, it resumes immediately ... doesn't look particularly 
OK to me:

$ strace -o /dev/null ./a.out | head -10
finished (without SIGCONT)
finished (without SIGCONT)
finished (without SIGCONT)
finished (without SIGCONT)
finished (without SIGCONT)
finished (without SIGCONT)
finished (without SIGCONT)
finished (without SIGCONT)
finished (without SIGCONT)
finished (without SIGCONT)

-- 
Jiri Kosina
SUSE Labs
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