linux-kernel - Re: General protection fault

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Date:	Wed, 21 May 2014 01:44:27 +0400
From:	Konstantin Khlebnikov <koct9i@...il.com>
To:	Martin <martin@...inoussheep.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: General protection fault - bug report 3.12.18

On Tue, May 20, 2014 at 11:40 PM, Martin <martin@...inoussheep.net> wrote:
>> I've looked into second crash. Just because gmail has marked that
>> email as important for some reason =)
>>
>> In function tid_fd_revalidate(), in line "file = fcheck_files(files,
>> fd)" file = is 0x0000000004000000 instead of valid pointer or NULL.
>> This value has only one non-zero bit, so this looks like memory
>> curruption.
>>
>> More likely this is hardware problem. Please check you memory with
>> memtest86 and/or try to replace it.
>
> Many thanks for looking into this, I was a bit worried that would be the
> answer as I've seen other crashes in what seem like random places.
>
> I already ran memtest86+ and it ran clean overnight and all day, so I
> thought it might just be a kernel bug still.
>
> Any other ideas how I could prove it to be a hardware issue?

I guess, only by replacing pieces.
As I see this is Lenovo Yoga2, this reminds me recent problems in
their firmware in T540 (or so).

You could run user-space memory tester like "memtester" in backround
while linux works.
Maybe it could catch that memory corruption. Probably it appears only
in particular situation.

>
> Regards,
> M
>
>
>
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