panic "Sleeping thread owns a non-sleepable lock" via cv_timedwait_signal, was "rsync over NFS"

[Norbert Aschendorff]

Another logs - even with a /var/crash crash report :)

Please note: The /var/crash files stem from another crash than the big
syslog does!

The syslog file inside the tarball is about 4.7 MB; it contains
everything since the start of the crash.

New /var/crash files:
http://lbo.spheniscida.de/Files/nfs-rsync-crash-witnessII.tgz
New syslog file:
http://lbo.spheniscida.de/Files/nfs-rsync-crash-witnessIII-only-messages.tgz

(Both < 100 KB)

The used kernel is called GENERIC-OWN-WITNESS and has all three WITNESS
options enabled and nothing else.

But I just get an idea: Should I try it without Rick's NFSv4
numeric-uid-gid patch? Or is that completely unrelated?
@Rick: Can you assure that it is impossible that the patch added this bug?

--norbert