tacho> lock order reversal
tacho>  1st 0xc03f0140 mntvnode @ /usr/src/sys/ufs/ffs/ffs_vfsops.c:1007
tacho>  2nd 0xcaec972c vnode interlock @ /usr/src/sys/ufs/ffs/ffs_vfsops.c:1016

matusita> Exactly the same kernel message was here.

ddb trace output is as follows.

db> trace
Debugger(c02bd5ae) at Debugger+0x44
witness_lock(c5ce622c,8,c02cde39,3f8) at witness_lock+0x90d
ffs_sync(c089f200,3,c05adc00,c5420200,c089f200,2) at ffs_sync+0x175
sync_fsync(c5831f5c) at sync_fsync+0x18f
sched_sync(0,c5831fa8) at sched_sync+0x16c
fork_exit(c01e839c,0,c5831fa8) at fork_exit+0xb4
fork_trampoline() at fork_trampoline+0x8

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