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

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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

#56063 — Bug#847549: kernel bug dcache.c 2373 invalid opcode 0000 d_materialise_unique

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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.

I don't mind trying a backports kernel as a workaround, but can anybody
comment on whether the backports kernel 4.7.8-1~bpo8+1 will match with
the NFS user space packages in jessie, or do I need to update some of
those packages too?

Having seen various crashes without stack dumps, I also tried checking
the RAM in the machine.  memtest86+ did not report any errors, either
using 8GB (upgraded) or the original 2GB from the vendor.  The machine
had 8GB when it crashed on 2016-12-02 and it had only 2GB when it
crashed again 2016-12-07

Regards,

Daniel


1. http://www.spinics.net/lists/linux-fsdevel/msg98540.html

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#56178

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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

> I don't mind trying a backports kernel as a workaround, but can anybody
> comment on whether the backports kernel 4.7.8-1~bpo8+1 will match with
> the NFS user space packages in jessie, or do I need to update some of
> those packages too?
[...]

I don't believe that's necessary; no-one has asked for a backport of
nfs-utils.

Ben.

-- 
Ben Hutchings
The two most common things in the universe are hydrogen and stupidity.

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#56193

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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#56179 — Processed: Re: kernel bug dcache.c 2373 invalid opcode 0000 d_materialise_unique

Processing control commands:

> tag -1 moreinfo
Bug #847549 [linux] kernel bug dcache.c 2373 invalid opcode 0000 d_materialise_unique
Added tag(s) moreinfo.

-- 
847549: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=847549
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems

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