linux-kernel - Re: Fix OOPS in crash_kernel

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Message-ID: <4BD00928.5010909@redhat.com>
Date:	Thu, 22 Apr 2010 16:30:32 +0800
From:	Cong Wang <amwang@...hat.com>
To:	Vitaly Mayatskikh <v.mayatskih@...il.com>
CC:	linux-kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Neil Horman <nhorman@...driver.com>
Subject: Re: Fix OOPS in crash_kernel_shrink

Vitaly Mayatskikh wrote:
> At Tue, 20 Apr 2010 20:56:14 +0800, Cong Wang wrote:
>> Vitaly Mayatskikh wrote:
>>> Two "echo 0 > /sys/kernel/kexec_crash_size" OOPSes kernel. Also
>>> content of this file is invalid after first shrink to zero: it shows 1
>>> instead of 0.
>>>
>>> This patch fixes it.
>> Hmmm, I certainly did tests for 'echo 0 > kexec_crash_size' when I
>> worked on this, but I didn't get any oops. Can you show me the full
>> oops?
> 
> Do it twice. start == end condition will work over and over, and
> kernel will try to release_resource() again (and that's causes OOPS).
> 

Hmm, I see. ACK to your patch.

Thanks much!

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