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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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Bug#847549: kernel bug dcache.c 2373 invalid opcode 0000 d_materialise_unique Daniel Pocock <daniel@pocock.pro> - 2016-12-09 09:40 +0100

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