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[Bug 1282302] Re: deadlock when unmounting nfs shares in trusty


rc3 is affected.

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  deadlock when unmounting nfs shares in trusty

Status in “linux” package in Ubuntu:

Bug description:
  In trusty, I frequently find that unmounting NFS shares (which I do on
  my laptop before roaming) frequently causes a "soft lockup" in the
  kernel that leaves me needing to hard reboot the system, because both
  network access and disk access start failing and the unmount itself
  never returns.

  The problem is not reproducible if I unmount the shares immediately
  after a reboot; I don't know why.  It could be related to the fact
  that some of these NFS shares are bind-mounted into chroots, but the
  problem is reproducible even when no bind mounts are active.

  This is a serious regression from previous kernels, which I think
  should be a priority for resolving in an LTS release.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-generic
  ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
  Uname: Linux 3.13.0-8-generic x86_64
  ApportVersion: 2.13.2-0ubuntu4
  Architecture: amd64
   /dev/snd/controlC1:  vorlon     4161 F.... pulseaudio
   /dev/snd/controlC0:  vorlon     4161 F.... pulseaudio
   /dev/snd/pcmC0D0p:   vorlon     4161 F...m pulseaudio
  CurrentDesktop: Unity
  Date: Wed Feb 19 14:38:51 2014
  HibernationDevice: RESUME=UUID=6df76279-19ea-45a4-bec9-e4fdc858729a
  InstallationDate: Installed on 2010-09-24 (1244 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  MachineType: LENOVO 2306CTO
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-8-generic root=UUID=362a1cf5-63b7-4122-8457-33ca1d10a8ad ro quiet splash vt.handoff=7
   linux-restricted-modules-3.13.0-8-generic N/A
   linux-backports-modules-3.13.0-8-generic  N/A
   linux-firmware                            1.124
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2013-10-23 (119 days ago)
  dmi.bios.date: 10/25/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET97WW (2.57 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2306CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ET97WW(2.57):bd10/25/2013:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2306CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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