panic in smdb

I have a freebsd FreeBSD 9.0 server serving iscsi, nfs and samba shares. It paniced today after 23 days of uptime mid way through a zfs get all tank, reporting some smbd libs on screen before a rushed the restart. It's running samba 3.6.1. I can't have nfs/iscsi crashing, so I may end up moving the samba sharing to a vm and link that with nfs. 23 days ago it crashed for the first time with no clue as to why.

It's a new Supermicro server with a Xeon ~5600 48 GB RAM with 7 1 TB drives in a raidz+2 (tank) on a pair of LSI HBAs and Corsair SSDs for OS/ZIL/cache devices. All the software is stock, though it was upgraded from 9.0r2.
 
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