panic: biodone: bp 0xcbe9c9e9 already done

Hi,

following is hand transcriped because the box hadn't had a
serial console for historical reasons :(
Unfortunately I also couldn't get a core.

The machine is MP with HEAD from around Jan 12 19:38 UTC, with
PREEMPTION and SU.


panic: biodone: bp 0xcbe9c9e9 already done
cpuid = 1
KBD: enter: panic
[thread pid 3 tid 100045 ]
Stopped at      kdb_enter+0x2c:  leav
db> where
Tracing pid 3 tid 100045 td 0xc1a0773
kdb_enter
panic
bufdone(cbe9c0e0,c1adc18c,d53dad0c,c05f90cb,c1adcdec) at bufdone+0x364
bufdonebio(c1adcdec,d53dacd4,8,c08ac1f2,1e4) at bufdonebio+0x4e
g_io_schedule_up(c1a07730,c05f9320,d53dad34,c0628f76,0) at g_io_schedule_up+0xab
g_up_procbody(0,d53dad48,0,c05f9320,0) at g_up_procbody+0x5a
fork_exit() at fork_exit+0x7e
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xd53dad7c, ebp = 0 ---
db> show locks
exlusive sleep mutx Giant r = 0 (0xc09b04c0) locked _at_ /local/building/FreeBSD/HEAD/sys/kern/vfs_bio.c:3109
exlusive sleep mutx g_xup r = 0 (0xd53dacd4) locked _at_ /local/building/FreeBSD/HEAD/sys/geom/geom_io.c:484


-- 
Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT