[Natty][SRU][PATCH] Kernel Oops : Dentry still in use (1) [unmount of nfs4 0:1d]
Chris J Arges
chris.j.arges at canonical.com
Wed Nov 30 19:12:23 UTC 2011
If two processes attempt to cause automounting on the same mountpoint at
the same time, the vfsmount holding the mountpoint will be left with one
too few references on it, causing a BUG when the kernel tries to clean up.
Fix has been cherry picked from 8aef18845266f5c05904c610088f2d1ed58f6be3t.
It has been accepted in 3.0 and is present in ubuntu-oneiric.
It applies cleanly to ubuntu-natty.
The procedure for replicating this bug is outlined in the patch
description. Essentially mounting an nfs mount with another mount in it.
Running a test program, and unmount the submount and original mount.
Patch is attached.
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