[Pkg-utopia-maintainers] Bug#641894: Some more information

[Jan Niggemann]

Hi all,

I'm on wheezy with WLAN configured through network-manager and I have 
this bug, too.
Shutdown freezes when a NFS share is still mounted.

I then did some research, perhaps this will help...

First, let me post references to what I believe is the same problem:
http://forums.debian.net/viewtopic.php?f=5&t=70798
https://bugs.launchpad.net/ubuntu/+source/autofs5/+bug/614731
http://crunchbang.org/forums/viewtopic.php?id=24991
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=539773
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=477498
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=552104
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=431966
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=516733
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=612379
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=641894

Now the interesting part
Shutdown goes well using the wheezy stock kernel 3.2.0-4-686-pae.
Without any changes to my system, just using a vanilla kernel 3.9, the 
shutdown freezes.
I'm confident that no nfs-relevant config switches differ between the 2 
kernels (diffed the configs).
To triage a bit further and to verify that network manager is at fault, 
I switched to using /etc/network/interfaces for my WLAN and repeated my 
test. I first used 3.2.0-4-686-pae, no problems. I then used my 3.9, 
also without problems.
Switching back to using network manager, the problem came back when I 
use kernel 3.9.

I have no idea what might be causing this.
As a workaround, I added ". /etc/init.d/umountnfs.sh" to alsa-utils, 
which is the first script executed on reboot and shutdown.