linux-kernel - Re: cfq bug still not fixed on x86

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Message-ID: <CANejiEUVeqjgEHumtEaCTpLgdQ54DWa3HJF-3qj+7t8F2bTXeg@mail.gmail.com>
Date:	Wed, 1 Feb 2012 11:18:34 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	walt <w41ter@...il.com>
Cc:	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Tejun Heo <tj@...nel.org>
Subject: Re: cfq bug still not fixed on x86

can you try the debug patch from Tejun:

http://marc.info/?l=linux-kernel&m=132683711206544&w=2

2012/2/1 walt <w41ter@...il.com>:
> Hi guys.  Linus recently commited this bugfix from Jens:
>
> commit 54b466e44b1c7809144bbd8cd6be3f85877ca46f
> Author: Jens Axboe
> Date:   Tue Jan 17 21:26:11 2012 +0100
>
>    cfq-iosched: fix use-after-free of cfqq
>
> That fixed the problem on my amd64x2 machine, but my old UP x86 amd
> machine is still producing the same backtrace when udevd segfaults
> during bootup.
>
> I'm wondering if the patch neglects some 32-bit or non-SMP code?
>
> Thanks for all your hard work on open-source :)
>
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