Hmm, I've got a suspicion it might be this:
commit c297c8b99b07f496ff69a719cfb8e8fe852832ed
Author: Andy Adamson <and...@netapp.com>
Date: Wed Nov 20 13:00:17 2013 -0500
SUNRPC: do not fail gss proc NULL calls with EACCES
I'm not familiar with this code at all, but I do see a possibility for
the state machine being processed in rpc_async_schedule() to get into an
infinite loop if gss_refresh_null() returns 0 and RPCAUTH_CRED_UPTODATE
is not set. That commit changes the function from returning -EACCESS to
returning 0, and I'm thinking maybe it should also be setting
RPCAUTH_CRED_UPTODATE.
You guys are welcome to continue the bisect, but if you want I can build
a kernel with that commit reverted to see if we can short-circuit the
process. If it is this commit then I _think_ the fix is trivial. Let me
know.
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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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