Steve: Have you tested any trusty kernels newer than 3.13.0-8.28?
Because starting with 3.13.0-9.29 there's a stable commit that seems
like it's probably a fix for your problem.
commit 6b75686cac9eadd03ebc3b195bdd5bc03b50419a
Author: Weston Andros Adamson <d...@netapp.com>
Date: Tue Dec 17 12:16:11 2013 -0500
sunrpc: Fix infinite loop in RPC state machine
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https://bugs.launchpad.net/bugs/1282302
Title:
deadlock when unmounting nfs shares in trusty
Status in “linux” package in Ubuntu:
Confirmed
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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