Unread portion of the kernel message buffer:
g_vfs_done():md0[WRITE(offset=268599296, length=16384)]error = 6
g_vfs_done():md0[WRITE(offset=268632064, length=32768)]error = 6
/dev: got error 6 while accessing filesystem
panic: lockmgr still held
cpuid = 0
KDB: enter: panic


#9  0xffffffff808cdc01 in panic (fmt=Variable "fmt" is not available.
)
    at /home/trasz/svn/spare/sys/kern/kern_shutdown.c:628
#10 0xffffffff808ae3a0 in lockdestroy (lk=0xffffff800023c830)
    at /home/trasz/svn/spare/sys/kern/kern_lock.c:438
#11 0xffffffff80954478 in brelse (bp=0xffffff803d25a400) at buf.h:430
#12 0xffffffff8095585c in bufdone (bp=0xffffff803d25a400)
    at /home/trasz/svn/spare/sys/kern/vfs_bio.c:3326
#13 0xffffffff808307cd in g_io_schedule_up (tp=Variable "tp" is not available.
)
    at /home/trasz/svn/spare/sys/geom/geom_io.c:687
#14 0xffffffff80830f42 in g_up_procbody (arg=Variable "arg" is not available.
)
    at /home/trasz/svn/spare/sys/geom/geom_kern.c:97
#15 0xffffffff80899f25 in fork_exit (
    callout=0xffffffff80830ed0 <g_up_procbody>, arg=0x0,
    frame=0xffffff800023cc00)
    at /home/trasz/svn/spare/sys/kern/kern_fork.c:995