linux-kernel - Re: [PATCH 2.6.27-rc5] Fix itimer/many thread hang.

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Message-Id: <20080910040404.245301541FE@magilla.localdomain>
Date:	Tue,  9 Sep 2008 21:04:04 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Ingo Molnar <mingo@...e.hu>, Frank Mayhar <fmayhar@...gle.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 2.6.27-rc5] Fix itimer/many thread hang.

> As for this particular function, it seems to me that ->signal == NULL
> is not possible, no?

The concern is to make sure that the timer tick path is always safe for a
tick that hits during release_task(current) in exit_notify().  A timer tick
there can come with current->signal == NULL.  We just need to make sure one
way or another that this is safe.


Thanks,
Roland
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