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[Steve Langasek <steve.langasek@xxxxxxxxxxxxx>]

Public bug reported:

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 3.13.0.8.12
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
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /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
RelatedPackageVersions:
 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)
WifiSyslog:
 
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

** Affects: linux (Ubuntu)
     Importance: High
         Status: New


** Tags: amd64 apport-bug regression-proposed trusty

** Changed in: linux (Ubuntu)
   Importance: Undecided => High

** Tags added: regression-proposed

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https://bugs.launchpad.net/bugs/1282302

Title:
  deadlock when unmounting nfs shares in trusty

Status in “linux” package in Ubuntu:
  New

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 3.13.0.8.12
  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
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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
  RelatedPackageVersions:
   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)
  WifiSyslog:
   
  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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