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Bug#847549: kernel bug dcache.c 2373 invalid opcode 0000 d_materialise_unique

Cross-posted to 2 groups.

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On 15/12/16 00:49, Ben Hutchings wrote:
> Control: tag -1 moreinfo
> 
> On Fri, 9 Dec 2016 09:35:40 +0100 Daniel Pocock <daniel@pocock.pro>
> wrote:
>> Package: linux Version: 3.16.36-1+deb8u1 Severity: important
>> 
>> The system is an NFS server running linux-image-3.16.0-4-amd64
>> 
>> At times of heavy load on NFS, such as "git checkout some-branch"
>> in a large repository, the system crashes (dmesg output
>> attached).  It has been happening regularly since the upgrade to
>> jessie and with every kernel released through stable updates.  I
>> don't recall seeing this in wheezy.
>> 
>> I've installed kdump-tools.  Sometimes it captures the dmesg
>> output, a recent example from a crash on 2016-12-02 is attached.
>> I'm not sure if the crashes without /var/crash logs are the same
>> bug.
>> 
>> The same crash was reported[1] on linux-fsdevel by another Debian
>> user.
> 
> Can you test the attached patches?  The first is the one J. Bruce 
> Fields pointed to and the second is in the same area; both of them
> went upstream in 3.17.
> 
> Instructions for rebuilding the kernel with patches: 
> https://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-common-official
>
> 
Thanks for this feedback.  If the backport kernel continues working
for me I'm not going to have time to test this in the near future as
there are a lot of other things that don't have such a workaround and
need more urgent attention.

If anybody else comes across this bug and really wants to stay on the
stable kernel then I would encourage you to test this and give feedback.

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Bug#847549: kernel bug dcache.c 2373 invalid opcode 0000 d_materialise_unique Daniel Pocock <daniel@pocock.pro> - 2016-12-09 09:40 +0100
  Bug#847549: kernel bug dcache.c 2373 invalid opcode 0000 d_materialise_unique Ben Hutchings <ben@decadent.org.uk> - 2016-12-15 01:00 +0100
    Bug#847549: kernel bug dcache.c 2373 invalid opcode 0000 d_materialise_unique Daniel Pocock <daniel@pocock.pro> - 2016-12-15 08:00 +0100
  Processed: Re: kernel bug dcache.c 2373 invalid opcode 0000  d_materialise_unique owner@bugs.debian.org (Debian Bug Tracking System) - 2016-12-15 01:00 +0100

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