Can't suspend laptop while nfs share mounted

[Dan Hallgren]

I use autofs to mount nfs shares but when doing so I'm unable to suspend my laptop. I get this error message:

Freezing of tasks failed after 20.00 seconds (1 tasks refusing to freeze, wq_busy=0):

Same result if I mount the shares manually.

I also tried a daily build of ubuntu 12.04 but the problem still exists.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: pm-utils 1.4.1-8ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-16.29-generic 3.0.20
Uname: Linux 3.0.0-16-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Tue Mar 13 15:40:52 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[draco (draco31-fr)]

In my case (bug #930576), I can't suspend to ram, only when nfs share are mounted in fstab. Even in this case, I've got the problem while Exaile access the nfs share, but can't reproduce the bug in other situations.
Using autofs solve the problem !
I use nfsv4, if the protocol version of nfs is important.

[Stephane Epardaud (stef-inforealm)]

Got it here too, I have to unmount every nfs mount to get it to suspend. Here's my trace:

[draco (draco31-fr)]

I read in an other bug (can't remember the bug number) that network is
stoped before unmounting share. This was causing problems with samba, and
was fixed by using umount hook script before shutting down the network.

May it be the same problem here with nfs share ?

draco

[Dan Hallgren (danha891)]

I think this commit is the solution to the problem and it was first released in v 3.3 in the upstream kernel.

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=d310310cbff18ec385c6ab4d58f33b100192a96a

I have tested with the beta of ubuntu 12.10 Qantal ( kernel 3.5.0-13) and I don't see this problem anymore.