LOR: kern_exec.c and vfs_cache.c

I got this LOR on 8.0-BETA3 when running pmcstat:

lock order reversal:
 1st 0xc55716a0 ufs (ufs) _at_ /usr/src/sys/kern/kern_exec.c:570
 2nd 0xc98f5a2c filedesc structure (filedesc structure)
_at_ /usr/src/sys/kern/vfs_cache.c:999 KDB: stack backtrace:
db_trace_self_wrapper(c0c6be4a,e6b5494c,c08bd7f5,c08ae67b,c0c6ed1d,...)
at db_trace_self_wrapper+0x26
kdb_backtrace(c08ae67b,c0c6ed1d,c452f500,c452c1d0,e6b549a8,...) at
kdb_backtrace+0x29
_witness_debugger(c0c6ed1d,c98f5a2c,c0c638c6,c452c1d0,c0c74e88,...) at
_witness_debugger+0x25
witness_checkorder(c98f5a2c,1,c0c74e88,3e7,0,...) at
witness_checkorder+0x839
_sx_slock(c98f5a2c,0,c0c74e88,3e7,c497a6c0,...) at _sx_slock+0x85
vn_fullpath(c497a6c0,c5571648,e6b54aa4,e6b54aa0,0,...) at
vn_fullpath+0x74 pmc_getfilename(c0c60fc0,3,c497a6c0,e6b54a60,246,...)
at pmc_getfilename+0x2e
pmc_hook_handler(c497a6c0,1,e6b54c1c,318,c0c90edb,...) at
pmc_hook_handler+0x279
kern_execve(c497a6c0,e6b54c58,0,283052a8,28305348,e164d000,e164d000,e164d020,e164d485,e168d000,3fb7b,3,24,0)
at kern_execve+0xe1c execve(c497a6c0,e6b54cfc,c,c497a6c0,c0d4e474,...)
at execve+0x4c syscall(e6b54d38) at syscall+0x2a3 Xint0x80_syscall() at
Xint0x80_syscall+0x20 --- syscall (59, FreeBSD ELF32, execve), eip =
0x28173eaf, esp = 0xbfbfe34c, ebp = 0xbfbfe378 ---


-- 
Bruce Cran