VFS panic(?).

Hi.

On a diskless machine (all file systems are NFS-mounted), when I start
syslogd and run:

	# tail -f /var/log/all.log

I get this panic:

panic: lockmgr: locking against myself
cpuid = 1
KDB: enter: panic
[thread pid 697 tid 100159 ]
Stopped at      kdb_enter+0x2b: nop     
db> tr
Tracing pid 697 tid 100159 td 0xc249d600
kdb_enter(c05d1267) at kdb_enter+0x2b
panic(c05cf2f1,c249d600,0,c06030e0,ed63ba78) at panic+0x127
lockmgr(c2545058,3001,c254507c,c249d600,ed63ba58) at lockmgr+0x3be
vop_stdlock(ed63ba78,1001,c2545000,ed63ba94,c04f2d5c) at vop_stdlock+0x1e
VOP_LOCK_APV(c0608a40,ed63ba78) at VOP_LOCK_APV+0x87
vn_lock(c2545000,1001,c249d600) at vn_lock+0xa8
filt_vfsread(c2532000,6) at filt_vfsread+0x3a
knote(c2870030,6,0) at knote+0x90
VOP_WRITE_APV(c0608a40,ed63bc40) at VOP_WRITE_APV+0x18c
vn_write(c23a4828,c286d380,c27a6c00,0,c249d600) at vn_write+0x1ea
kern_writev(c249d600,a,c286d380,c286d380,0) at kern_writev+0x8e
writev(c249d600,ed63bd04,3,1f,246) at writev+0x30
syscall(bfbf003b,805003b,bfbf003b,80574d8,bfbfcf20) at syscall+0x22f
Xint0x80_syscall() at Xint0x80_syscall+0x1f
--- syscall (121, FreeBSD ELF32, writev), eip = 0x280c8d5b, esp = 0xbfbfc83c, ebp = 0xbfbfcf48 ---

This is HEAD from yesterday.

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd_at_FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!