PANIC: udf / lockmgr: locking against myself

Hello,

I tried to read a backup DVD with UDF filesystem and I get the following 
panick with yesterdays -current:

mount_udf /dev/acd1 /mnt
# cd /mnt
# ls
Various Artists
# cd Various
panic: lockmgr: locking against myself
KDB: enter: panic
[thread pid 59 tid 100065 ]
Stopped at      kdb_enter+0x32: leal    0(%esi),%esi
db> where
Tracing pid 59 tid 100065 td 0xc209b000
kdb_enter(c0779d0b,c07e7c20,c0777eb6,d9b46900,c209b000) at kdb_enter+0x32
panic(c0777eb6,0,c0777d84,b5,c078327c) at panic+0x14d
lockmgr(c20c1168,3002,c20c118c,c209b000,d9b46958) at lockmgr+0x7c2
vop_stdlock(d9b46980,c209b078,1002,1002,c20c1110) at vop_stdlock+0x2f
VOP_LOCK_APV(c07b1da0,d9b46980,c078327c,31f,800) at VOP_LOCK_APV+0x79
vn_lock(c20c1110,1002,c209b000,d9b469e8,c20ddbf4) at vn_lock+0x69
udf_lookup(d9b46a3c,c20c1110,d9b46c1c) at udf_lookup+0x283
VOP_CACHEDLOOKUP_APV(c07b1da0,d9b46a3c,d9b46c1c,c209b000,c1d63d80) at 
VOP_CACHED
LOOKUP_APV+0x71
vfs_cache_lookup(d9b46ae8,d9b46ae8,c20c1110,c20c1110,d9b46ae8) at 
vfs_cache_look
up+0xf3
VOP_LOOKUP_APV(c07b1da0,d9b46ae8,c209b000,c0782a9a,d9b46c08) at V
x79
lookup(d9b46bf4,0,c078222d,b4,c078327c) at lookup+0x34a
namei(d9b46bf4,c209b000,d9b46b94,246,0) at namei+0x329
kern_stat(c209b000,8068088,0,d9b46c68,3ea) at kern_stat+0x3d
stat(c209b000,d9b46d04,8,16,2) at stat+0x2d
syscall(3b,3b,3b,4,8068064) at syscall+0x13d
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (188, FreeBSD ELF32, stat), eip = 0x2812bb5f, esp = 0xbfbfebbc, 
ebp
= 0xbfbfecc8 ---

Tell me if you need more info.

Thanks,

-Harry