softdep_flush panic with snapshots

With GENERIC HEAD from Apr 4 14:50 UTC I got this panic:


panic: lockmgr: thread 0xc22a6d80, not exclusive lock holder 0xc240fa20
unlocking
cpuid = 0
KDB: enter: panic
[thread pid 45 tid 100043 ]
Stopped at      kdb_enter+0x2b: nop
db> where
Tracing pid 45 tid 100043 td 0xc22a6d80
kdb_enter(c08a1a10) at kdb_enter+0x2b
panic(c089f9af,c22a6d80,c089f999,c240fa20,c22a6d80) at panic+0x14b
lockmgr(c2a54e90,6,c2a54eb4,c22a6d80,cc998c2c) at lockmgr+0x514
vop_stdunlock(cc998c4c,c2941294,c2a54e38,cc998c68,c06c74b4) at
vop_stdunlock+0x22
VOP_UNLOCK_APV(c09475a0,cc998c4c) at VOP_UNLOCK_APV+0x95
vput(c2a54e38,c09caab8,0,c08b9e51,df7) at vput+0xe4
handle_workitem_remove(c2e38280,0) at handle_workitem_remove+0x10f
process_worklist_item(c23fca20,0) at process_worklist_item+0x183
softdep_process_worklist(c23fca20,0,0,c23e3234,c079ab50) at
softdep_process_worklist+0x7c
softdep_flush(0,cc998d38) at softdep_flush+0x132

There's no dump, but I ran the test in single user mode so I hope it's
not totally worthlesss.

http://people.freebsd.org/~pho/stress/log/cons198.html
-- 
Peter Holm