linux-kernel - Re: [PATCH] sched: fix fork() error path to not crash.

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Message-ID: <CAKUOC8Uy_YeoMW_S_JZbZUr1i_3mJGNfrNs676rc_o28WJGhjA@mail.gmail.com>
Date:	Tue, 26 Jun 2012 09:58:41 -0700
From:	Salman Qazi <sqazi@...gle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: fix fork() error path to not crash.

On Tue, Jun 26, 2012 at 1:40 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> On Mon, 2012-06-25 at 18:18 -0700, Salman Qazi wrote:
>> In dup_task_struct, if arch_dup_task_struct fails, the clean up
>> code fails to clean up correctly.  That's because the clean up
>> code depends on unininitalized ti->task pointer.  We fix this
>> by making sure that the task and thread_info know about each other
>> before we attempt to take the error path.
>>
>> Signed-off-by: Salman Qazi <sqazi@...gle.com>
>
> Cute, however did you find that?

Our test infrastructure folks have developed a fault injection
framework geared towards detecting bugs triggered by memory allocation
failures in random places.
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