deadc0de panic in unmount()

-current from a few days ago.  It was probably unmounting a nullfs,
devfs or linprocfs.

panic(c06f100c,63676b70,c06efede,e4,c06f4bb5) at panic+0xac
_mtx_lock_spin(deadc0de,0,c06efede,e4,c06f9e60) at _mtx_lock_spin
lockmgr(c59df420,10007,c077c480,ca6e1000,379) at lockmgr+0x132
dounmount(c59df400,8080000,ca6e1000,379,734ff58) at dounmount+0xa5
unmount(ca6e1000,f13a6d14,8,e,2) at unmount+0x1f4
syscall(2f,2f,2f,82ff704,8573911) at syscall+0x13b
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (22, FreeBSD ELF32, unmount), eip = 0x82a21df, esp = 0xbfbfe0ac, ebp = 0xbfbfe168 ---
db> x/x 0xc59df420
0xc59df420:     deadc0de
db> x/x 0xc59df400
0xc59df400:     deadc0de

Kris