Strange panic on ppc64

Tue Nov 12 16:32:34 UTC 2013

The log is attached.  I'm not sure what exactly is going on here.  The
conditions were: building something on zfs, while also accessing files over
NFS.  It seems each of those individually is fine, but doing both it brings
my system down.  I _think_ the actual panic message (recursed on
non-recursive mutex) is a red herring, since it already trapped in the
kernel, twice.  Any clues?  It's 100% reproducible by me.

- Justin
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