lock order reversal:
1st 0xffffff0003a2d7f8 ufs (ufs) @ sys/ufs/ffs/ffs_snapshot.c:424
2nd 0xfffffffe53e58bc8 bufwait (bufwait) @ sys/kern/vfs_bio.c:2443
3rd 0xffffff00034fc7f8 ufs (ufs) @ sys/ufs/ffs/ffs_snapshot.c:545
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
_witness_debugger() at _witness_debugger+0x2e
witness_checkorder() at witness_checkorder+0x81e
__lockmgr_args() at __lockmgr_args+0xc2a
ffs_lock() at ffs_lock+0x8c
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
_vn_lock() at _vn_lock+0x47
ffs_snapshot() at ffs_snapshot+0x1c09
ffs_mount() at ffs_mount+0x666
vfs_donmount() at vfs_donmount+0xe31
nmount() at nmount+0xa6
syscall() at syscall+0x1bf
Xfast_syscall() at Xfast_syscall+0xab
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