lock order reversal bufwait/dirhash

Got this during installworld (source on NFS, destination UFS on CF-card)
Source is current checked out yesterday.

lock order reversal:
 1st 0xc28b85b4 bufwait (bufwait) _at_ /data/builder/c13-2010-06-07/head/sys/kern/vfs_bio.c:2575
 2nd 0xc343f000 dirhash (dirhash) _at_ /data/builder/c13-2010-06-07/head/sys/ufs/ufs/ufs_dirhash.c:283
KDB: stack backtrace:
db_trace_self_wrapper(c0905b2b,c0d02c56,c2d3d030,c2d40500,ca657890,...) at db_trace_self_wrapper+0x26
_witness_debugger(c0d02c56,c343f000,c0d279c2,c2d40500,c0d2762e,...) at _witness_debugger+0x25
witness_checkorder(c343f000,9,c0d2762e,11b,0,...) at witness_checkorder+0x73c
_sx_xlock(c343f000,0,c0d2762e,11b,c3a07e80,...) at _sx_xlock+0x51
ufsdirhash_acquire(e,1828,ca6579f0,c3a07e80,cb2bd814,...) at ufsdirhash_acquire+0x35
ufsdirhash_add(c3a07e80,ca6579f0,1828,ca657950,ca657954,...) at ufsdirhash_add+0x1f
ufs_direnter(c3944dd0,c423e220,ca6579f0,ca657bd0,c292ccb0,...) at ufs_direnter+0x894
ufs_mkdir(ca657bf8,ca657c0c,2,0,0,...) at ufs_mkdir+0x51c
VOP_MKDIR_APV(c0e0f4c0,ca657bf8,ca657bd0,ca657b3c,2,...) at VOP_MKDIR_APV+0x8e
kern_mkdirat(c39264e0,ffffff9c,80513e0,0,1c0,...) at kern_mkdirat+0x240
kern_mkdir(c39264e0,80513e0,0,1c0,ca657c7c,...) at kern_mkdir+0x2f
mkdir(c39264e0,ca657cec,ca657d28,c0d014f7,0,...) at mkdir+0x27
syscallenter(c39264e0,ca657ce4,ca657ce4,0,c0e630c0,...) at syscallenter+0xc6
syscall(ca657d28) at syscall+0x3a
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (136, FreeBSD ELF32, mkdir), eip = 0x281817cf, esp = 0xbfbfe30c, ebp = 0xbfbfe398 ---

-- 
B.Walter <bernd_at_bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.