[zfs] [lor] vfs_mount.c (zfs) and vfs_subr.c (devfs)

(Happens on every reboot, system was cleanly shutdown)
 

Trying to mount root from ufs:/dev/mirror/gm0s1a
re0: link state changed to UP
lock order reversal:
 1st 0xffffff000b1cc620 zfs (zfs) _at_ /usr/src/sys/kern/vfs_mount.c:1059
 2nd 0xffffff000b1bb9d0 devfs (devfs) _at_ /usr/src/sys/kern/vfs_subr.c:2092
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
kdb_backtrace() at kdb_backtrace+0x32
_witness_debugger() at _witness_debugger+0x1e
witness_checkorder() at witness_checkorder+0x8c7
__lockmgr_args() at __lockmgr_args+0x7cc
vop_stdlock() at vop_stdlock+0x51
VOP_LOCK1_APV() at VOP_LOCK1_APV+0xbf
_vn_lock() at _vn_lock+0x6e
vget() at vget+0xc8
devfs_allocv() at devfs_allocv+0x103
devfs_root() at devfs_root+0x4c
vfs_donmount() at vfs_donmount+0x1618
nmount() at nmount+0xb5
syscall() at syscall+0x30c
Xfast_syscall() at Xfast_syscall+0xab
--- syscall (378, FreeBSD ELF64, nmount), rip = 0x8007a064c, rsp = 
0x7fffffffdd98, rbp = 0x800a04048 ---

/usr/src/sys/kern/vfs_mount.c:
     $FreeBSD: src/sys/kern/vfs_mount.c,v 1.299 2009/02/05 15:03:35 
attilio Exp $

/usr/src/sys/kern/vfs_subr.c:
     $FreeBSD: src/sys/kern/vfs_subr.c,v 1.758 2009/02/06 20:06:48 jhb Exp $


FreeBSD daedalus.lab.local 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Thu Mar  
5 12:16:04 WET 2009     
root_at_daedalus.lab.local:/usr/obj/usr/src/sys/DAEDALUS  amd64