linux-kernel - Re: kernel BUG - handle_mm_fault - Ubuntu 14.04 kernel 3.13.0-29-generic

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Date:	Mon, 14 Jul 2014 15:40:55 +0200
From:	Peter Maloney <peter.maloney@...ckmann-consult.de>
To:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Rik van Riel <riel@...hat.com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Kamal Mostafa <kamal@...onical.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: kernel BUG - handle_mm_fault - Ubuntu 14.04 kernel 3.13.0-29-generic


On 2014-06-19 18:36, Kirill A. Shutemov wrote:
> On Thu, Jun 19, 2014 at 06:10:11PM +0200, Peter Maloney wrote:
>> Hi, can someone please take a look at this and tell me what is going on?
>>
>> The event log reports no ECC errors.
>>
>> This machine was working fine with an older Ubuntu version, and has
>> failed this way twice since an upgrade 2 weeks ago.
>>
>> Symptoms include:
>>  - load goes up high, currently 1872.72
>>  - "ps -ef" hangs
>>  - this time I tested "echo w > /proc/sysrq-trigger" which made the
>> local shell and ssh hang, and ctrl+alt+del doesn't work, but machine
>> still responds to ping
>>
>> Please CC me; I'm not on the list.
>>
>> Thanks,
>> Peter
>>
>>
>>
>> Here's the log:
>>
>> Jun 12 15:42:42 node73 kernel: [17196.908781] ------------[ cut here
>> ]------------
>> Jun 12 15:42:42 node73 kernel: [17196.909789] kernel BUG at
>> /build/buildd/linux-3.13.0/mm/memory.c:3756!
> Looks like this:
>
> http://lkml.org/lkml/2014/5/8/275
>
> It seems the commit 107437febd49 has added to 3.13.11.3 "extended stable",
> but not in other -stable.
>
> Rik, should it be there too?
>
Hello again, I just wanted to say that I have built a kernel with this
fix on Jun 26, deployed it on the problem machines, and it has been
stable ever since.

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