[Bug 790220] Re: Kernel panic from nfsd on lightly loaded system

[Dern]

Looking at the log files on the server I actually see a number of non-
fatal mount.nfs4 crashes during the day (see attachment).

The actual crashes seem to be related to nfsd if I interpret the output
from /var/log/messages (excerpt attached) correctly.

I can't match the crashes to any specific events. sar doesn't show any
specific periods of high load (however small burst of very high load may
not get logged)

Unfortunately I'm way out of my league here trying to figure out what is
actually going on.

cat /proc/version
Linux version 2.6.32-32-generic (buildd at allspice) (gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #62-Ubuntu SMP Wed Apr 20 21:52:38 UTC 2011

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https://bugs.launchpad.net/bugs/790220

Title:
  Kernel panic from nfsd on lightly loaded system

Status in “nfs-utils” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: nfs-kernel-server

  Twice in the past six months this box has experienced a kernel panic.
  There are two active client machines.  The nfs exports are of a drbd
  (protocol C) mounted device formatted ext4 on an underlying 3ware
  9650SE-16ML with 10 2TB WD RE4 SATA drives for a total of ~9TB.  The
  networking includes an 4x LACP bonded network device.  (Overkill, in
  hindsight.) CPU was fairly low at ~10%.  There are no logs of the
  event, but we did snap a picture with a phone:
  http://geekomatic.ch/images/nfsd-goes-boom.jpg

  As I expect this to occur again at some point, I'm going to tweak the
  console settings in hopes of catching more information.  Even peak
  loads are not that high...so adding some debug logging is an option.
  Let me know.

  Dropping the LACP is an option.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-24-server 2.6.32-24.43
  Regression: No
  Reproducible: No
  ProcVersionSignature: Ubuntu 2.6.32-24.43-server 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-24-server x86_64
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  Date: Mon May 30 14:52:34 2011
  Frequency: Once every few months.
  InstallationMedia: Ubuntu-Server 10.04 LTS "Lucid Lynx" - Release amd64 (20100427)
  Lsusb:
   Bus 002 Device 003: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
   Bus 002 Device 002: ID 8087:0020  
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 002: ID 8087:0020  
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  PciMultimedia:
   
  ProcCmdLine: BOOT_IMAGE=/vmlinuz-2.6.32-24-server root=/dev/mapper/hostname-root ro
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux
  dmi.bios.date: 10/28/2009
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: KGIBX10J.86A.3878.2009.1028.1049
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: DP55KG
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE47218-404
  dmi.chassis.type: 2
  dmi.modalias: dmi:bvnIntelCorp.:bvrKGIBX10J.86A.3878.2009.1028.1049:bd10/28/2009:svn:pn:pvr:rvnIntelCorporation:rnDP55KG:rvrAAE47218-404:cvn:ct2:cvr:

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