Public bug reported:
I have a particular NFS share that apparently is buggy. Once mounted, it
can't be unmounted, always reporting that it's busy. Consequently, the
system hangs toward the end of the shutdown process (at the partition
unmounting step, I believe). It's then necessary to use the Magic SysRq
functions to reboot in a somewhat-nice manner.
Here are the details. I'm experiencing the issue on a clean install of
Feisty, but I previously experienced it in Edgy (upgraded from Dapper).
My server is still running Edgy--also upgraded from Dapper. I have four
NFS shares in my fstab. Only one gives me problems. I suspect that
something's wrong somehow with it, but I don't know what to do to
troubleshoot it. One of my shares exports a subdirectory of the problem
partition; that share causes no problems.
I can work around the problem by writing a sysvinit kill script that
unmounts all partitions mounted on the troublesome mount, then remounts
the buggy share read-only. I run this script before any NFS or network
kill scripts (K02). When that happens, the partition gets unmounted
properly and doesn't hang the system.
I'm really not too sure about in which package this bug should be
addressed. I listed sysvinit because ultimately, there should be some
sort of timeout (at the minimum) so that a misbehaving program can't
hang the system. On the other hand, this might be an issue with NFS.
** Affects: sysvinit (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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Can't shutdown because an NFS share isn't being unmounted
https://bugs.launchpad.net/bugs/118902
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