panic right now in 6.0

I've just got a panic when run tinderbox on my test 6.0 box.
It's a day before BETA3.

Here is details:
Tracing pid 53094 tid 100125 td 0xc19c8190
kdb_enter(c070076b,c075a380,c06ff31a,d11a496c,100) at kdb_enter+0x30
panic(c06ff31a,c177204c,c2d71018,c2d71000,c0606a03) at panic+0xd5
lockmgr(c2675af8,2002,c2675b1c,c19c8190,d11a49c0) at lockmgr+0x42d
vop_stdlock(d11a49f0,c19c8190,2002,c2675aa0,d11a4a0c) at vop_stdlock+0x2f
VOP_LOCK_APV(c0738d00,d11a49f0,c2607bb0,d11a49ec,c058bd42) at 
VOP_LOCK_APV+0x54
vn_lock(c2675aa0,2002,c19c8190,4,d11a4a40) at vn_lock+0x13c
vrele(c2675aa0,0,c22af76e,27c,c2675aa0) at vrele+0x10c
null_reclaim(d11a4a94,d11a4ac0,c0597d8f,c22b0a40,d11a4a94) at 
null_reclaim+0x7b
VOP_RECLAIM_APV(c22b0a40,d11a4a94,c19c8190,0,0) at VOP_RECLAIM_APV+0x3e
vgonel(c2837880,d11a4b78,c05a5ef1,c19c8190,60) at vgonel+0x25f
vrecycle(c2837880,c19c8190,d11a4b00,c06e7fde,d11a4b1c) at vrecycle+0x76
null_inactive(d11a4b1c,d11a4b30,c0597262,c22b0a40,d11a4b1c) at 
null_inactive+0x25
VOP_INACTIVE_APV(c22b0a40,d11a4b1c,0,d11a4b24,c22af511) at 
VOP_INACTIVE_APV+0x3e
vinactive(c2837880,c19c8190,0,0,11ad3b1) at vinactive+0x82
vput(c2837880,ffffffdf,c236ea00,0,c19c8190) at vput+0x18f
kern_lstat(c19c8190,8055240,0,d11a4c68,0) at kern_lstat+0xb3
lstat(c19c8190,d11a4d04,8,d11a4d2c,c05535e6) at lstat+0x2f
syscall(3b,3b,3b,8055200,8055244) at syscall+0x340
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (190, FreeBSD ELF32, lstat), eip = 0x280acde8, esp = 
0xbfbf73a4, ebp = 0xbfbf7430 ---

--
Sem.