linux-kernel - Re: 2.6.35-rc3 -- kernel BUG at mm/vmalloc.c:216! - invalid opcode: 0000 [#1] PREEMPT SMP DEBUG

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Message-ID: <4C230E3F.4020107@gmail.com>
Date:	Thu, 24 Jun 2010 09:50:23 +0200
From:	Tejun Heo <htejun@...il.com>
To:	Xiaotian Feng <xtfeng@...il.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
CC:	Miles Lane <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cliff Wickman <cpw@....com>, stable@...nel.org
Subject: Re: 2.6.35-rc3 -- kernel BUG at mm/vmalloc.c:216! - invalid opcode:
 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC

On 06/24/2010 09:45 AM, Xiaotian Feng wrote:
>> It's probably the same bug Cliff Wickman reported.
>> per_cpu_ptr_to_phys() was using wrong first chunk match logic which
>> ends up passing wrong addresses to vmalloc_to_page().  I have the
>> following fix patch queued in percpu#for-linus branch and was waiting
>> for Linus to come back.
>>
>>  http://git.kernel.org/?p=linux/kernel/git/tj/percpu.git;a=commitdiff_plain;h=9983b6f0cf8263e51bcf4c8a9dc0c1ef175b3c60;hp=a92d3ff9e5dbd958d8008a3e7a573e988e370ca3
>>
>> Can you please verify the above patch fixes the problem?
> 
> Yes, that patch fixes the problem on my box, thanks.

Thanks for verifying.  Greg, we'll have to wait till Linus comes back
for mainline but maybe it's a good idea to put this into -stable queue
early?  It's a rather straight forward bug fix and unlikely to be
contentious.

Thanks.

-- 
tejun
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