[Bug 855511] Re: oom-killer kills almost all due to nfs-kernel-server bug?

[Vladimir]

** Attachment added: "logs of the last incident"
   https://bugs.launchpad.net/bugs/855511/+attachment/2435718/+files/syslog

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Title:
  oom-killer kills almost all due to nfs-kernel-server bug?

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

Bug description:
  From time to time (sometimes it happens once a week, sometimes - several times a day) on loaded fileserver oom-killer began to kill almost everything. The only way to stop this is to restart the nfs-kernel-server (if I'm lucky enough to be able to log in using ssh).
  A sample of such "kills" is attached as file named syslog (the last line is a manual reboot of this server - it was impossible to restart nfs-kernel-server this time).
  From the other hand, it soes not seems that server is out of memory: it has free RAM and a lot of swap space:

  15:15:02    kbmemfree kbmemused  %memused kbbuffers  kbcached  kbcommit   %commit
  15:15:02       471904   3588184     88,38     15672   2244164    577396      5,82
  15:25:01       472852   3587236     88,35      4356   2239092    576804      5,81
  15:35:02       711904   3348184     82,47      3896   2271532    204888      2,06
  Average    681650   3378438     83,21    162473   2151526    502496      5,06

  15:42:38          LINUX RESTART

  (this is last incident)

  I have sar running, but I could not understand the reason of such oom-
  killer's behavior.

  If there is any need of additional information - I would be happy to
  send it, but please note that this is a production server, so I could
  not reboot it too many times.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: nfs-kernel-server 1:1.2.0-4ubuntu4.1
  ProcVersionSignature: Ubuntu 2.6.32-33.72-generic-pae 2.6.32.41+drm33.18
  Uname: Linux 2.6.32-33-generic-pae i686
  Architecture: i386
  Date: Wed Sep 21 16:15:01 2011
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100427.1)
  ProcEnviron:
   LANG=ru_RU.UTF-8
   SHELL=/bin/bash
  SourcePackage: nfs-utils

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