panic: lockmgr: thread 0x..., not exclusive lock holder 0x... unlocking


I got a panic on my workstation (6.1-RELEASE-p2 amd64).

-----
panic: lockmgr: thread 0xffffff007b910be0, not exclusive lock holder 0xffffff001c114720 unlocking
cpuid = 1
KDB: enter: panic
[thread pid 43 tid 100037 ]
Stopped at kdb_enter+0x2f: nop
db> bt
Tracing pid 43 tid 100037 td 0xffffff007b910be0
kdb_enter() at kdb_enter+0x2f
panic() at panic+0x291
lockmgr() at lockmgr+0x7a7
VOP_UNLOCK_APV() at VOP_UNLOCK_APV+0x49
vput() at vput+0x81
handle_workitem_remove() at handle_workitem_remove+0x215
process_worklist_item() at process_worklist_item+0x1d9
softdep_process_worklist() at softdep_process_worklist+0x7f
softdep_flush() at softdep_flush+0x15d
fork_exit() at fork_exit+0x86
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xffffffffb1b8ad00, rbp = 0 ---
-----


--
Jun Kuriyama <kuriyama@xxxxxxxxxxxx> // IMG SRC, Inc.
<kuriyama@xxxxxxxxxxx> // FreeBSD Project
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