linux-kernel - Re: 3.16.1 - general protection fault

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Message-ID: <20140930145055.GA24978@gallifrey>
Date:	Tue, 30 Sep 2014 15:50:55 +0100
From:	"Dr. David Alan Gilbert" <dave@...blig.org>
To:	Marcin Gibula <m.gibula@...il.com>
Cc:	linux-kernel@...r.kernel.org, aarcange@...hat.com
Subject: Re: 3.16.1 - general protection fault

* Dr. David Alan Gilbert (dave@...blig.org) wrote:
> * Marcin Gibula (m.gibula@...il.com) wrote:
> 
> Hi Marcin,
> 
> > Hi,
> > 
> > I've been playing with 3.16 kernel on my test machine as a KVM
> > hypervisor and encountered the following crash twice (almost identical
> > backtraces).
> > 
> > Sep 24 09:39:31 dev4 kernel: general protection fault: 0000 [#1] SMP
> 
> <snip>
> 
> > This machine is serving as NFS client and KVM hypervisor. I'm still
> > not sure how to trigger it reliably (right now, I just have to run
> > ubuntu instalation in VM guest multiple times and sometimes it
> > triggers).
> > 
> > Attaching .config, slub.s and disassembled __kmalloc_node_track_caller function.
> 
> Yes, I hit something similar:
> 
> http://www.spinics.net/lists/linux-nfs/msg46047.html 'nfs: disallow duplicate pages in pgio page vectors'
> http://www.spinics.net/lists/linux-nfs/msg46048.html 'nfs: can_coalesce_requests must enforce contiguity'
> 
> seem to stop the GPF's/crashes, although there's still something else
> going on with a corruption I'm seeing every so often.

And that 'something else' seems to be fixed by:

http://marc.info/?l=linux-nfs&m=141208464631105&w=2

Enjoy,

Dave
-- 
 -----Open up your eyes, open up your mind, open up your code -------   
/ Dr. David Alan Gilbert    |       Running GNU/Linux       | Happy  \ 
\ gro.gilbert @ treblig.org |                               | In Hex /
 \ _________________________|_____ http://www.treblig.org   |_______/
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