LOR in pseudofs

lock order reversal
 1st 0xc0903e40 pseudofs_vncache (pseudofs_vncache) _at_
/usr/src/sys/fs/pseudofs/pseudofs_vncache.c:226
 2nd 0xc0908260 Giant (Giant) _at_ /usr/src/sys/kern/kern_synch.c:249
KDB: stack backtrace:
kdb_backtrace(c085002d,c0908260,c084d1f1,c084d1f1,c084dea8) at
kdb_backtrace+0x2f
witness_checkorder(c0908260,9,c084dea8,f9,c0908220) at witness_checkorder+0x5d9
_mtx_lock_flags(c0908260,0,c084dea8,f9,0) at _mtx_lock_flags+0x32
msleep(c469cc08,c09087bc,50,c084928d,0) at msleep+0x457
acquiredrain(c469cc04,1000040,c084c33b,e7,c3f7a160) at acquiredrain+0x9c
lockmgr(c469cc04,10007,c469cb58,c3f7a160,e5143ba0) at lockmgr+0x4d2
vop_stdlock(e5143bf8,e5143c14,c068ce26,e5143bf8,1) at vop_stdlock+0x2c
vop_defaultop(e5143bf8,1,c062ccaf,c090f400,8) at vop_defaultop+0x18
vclean(c469cb58,8,c3f7a160,c469cb58,c3f7a160) at vclean+0x50
vgonel(c469cb58,c3f7a160,c0853c09,a43,0) at vgonel+0x5f
vgone(c469cb58,0,c0849739,e2,c35dc5a0) at vgone+0x42
pfs_exit(0,c3f7da68,c084b8ec,cc,c0908260) at pfs_exit+0x74
exit1(c3f7a160,0,e5143d40,c07e88eb,c3f7a160) at exit1+0x2ed
exit1(c3f7a160,e5143d14,4,c0851129,1) at exit1
syscall(2f,2f,2f,bfbfe508,bfbfe468) at syscall+0x275
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (1, FreeBSD ELF32, sys_exit), eip = 0x832d7c7, esp = 0xbfbfe434, ebp
= 0xbfbfe440 ---
KDB: enter: witness_checkorder