kern/121809: unable to umount

[vwe at FreeBSD.org]

Synopsis: unable to umount

State-Changed-From-To: open->feedback
State-Changed-By: vwe
State-Changed-When: Tue Mar 18 21:30:16 UTC 2008
State-Changed-Why: 

Unfortunately your report does not contain much information to work on.
Please send us the following information:
mount
dmesg
sysctl vfs
If this is consistent behaviour with only a specific filesystem, please
provide additional output of:
dumpfs (fsinquestion)
disklabel (slice/deviceinquestion)
Please try if this is still an issue with or without softupdates enabled and
if it helps to sync;sync before umount'ing.
If not, please send us your kernel config or at least a diff to GENERIC.
Best is to try if you're able to reproduce this using a GENERIC kernel.

http://www.freebsd.org/cgi/query-pr.cgi?pr=121809