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SubjectRe: cfq bug still not fixed on x86
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can you try the debug patch from Tejun:

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

2012/2/1 walt <w41ter@gmail.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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