CISS(4) dumps core at shutdown

[Per olof Ljungmark]

After running -CURRENT on several machines for nine months this is the 
first major issue I've seen, probably because I just said there were no 
problems...

HP ProLiant DL360G3 1G RAM SMARTArray 5
Kernel is GENERIC
7.0-CURRENT FreeBSD 7.0-CURRENT #0: Mon Jun  4 12:14:26 CEST 2007

Since last weekend, when issuing shutdown or halt, it will panic just after

All buffers synced
Uptime: 37m7s
panic: witness_save: lock (sleep mutex) cissmtx not locked

Could it be a hardware problem or did I hit a bug?

Thank you,

Per olof