BTW, I seem to be hitting yet another lockmgr-related panic.

My system won't reboot under certain conditions: it'll panic instead
in vfs_unmountall().  Namely it will panic if I reboot from single-user
mode while it'll reboot OK from multi-user mode.  I have no idea
yet about the exact reason for the behaviour.  The output from kgdb
attached.

Note that this panic shouldn't be NTFS-related as I can trigger it
by typing `reboot' immediately after booting into single user.

Thanks!

-- 
Yar

Waiting (max 60 seconds) for system process `vnlru' to stop...done
Waiting (max 60 seconds) for system process `bufdaemon' to stop...done
Waiting (max 60 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining...0 0 0 0 0 0 0 0 done
All buffers synced.
panic: lock (lockmgr) vfslock not locked @ /usr/src/sys/kern/vfs_mount.c:1317
cpuid = 0
KDB: enter: panic
panic: from debugger
cpuid = 0
Uptime: 3m6s
Physical memory: 499 MB
Dumping 31 MB: 16

#0  doadump () at pcpu.h:195
195     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) where
#0  doadump () at pcpu.h:195
#1  0xc0768d4e in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:417
#2  0xc0769013 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:571
#3  0xc048f567 in db_panic (addr=Could not find the frame base for "db_panic".
) at /usr/src/sys/ddb/db_command.c:444
#4  0xc048ff6c in db_command (last_cmdp=0xc0bf8e54, cmd_table=0x0, dopager=1)
    at /usr/src/sys/ddb/db_command.c:411
#5  0xc049007a in db_command_loop () at /usr/src/sys/ddb/db_command.c:464
#6  0xc049181d in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:228
#7  0xc0792036 in kdb_trap (type=3, code=0, tf=0xd614aadc)
    at /usr/src/sys/kern/subr_kdb.c:510
#8  0xc0a798cb in trap (frame=0xd614aadc) at /usr/src/sys/i386/i386/trap.c:647
#9  0xc0a5f2bb in calltrap () at /usr/src/sys/i386/i386/exception.s:146
#10 0xc07921ba in kdb_enter (why=0xc0b0cbb4 "panic", msg=0xc0b0cbb4 "panic")
    at cpufunc.h:60
#11 0xc0768ffc in panic (fmt=0xc0b11aed "lock (%s) %s not locked @ %s:%d")
    at /usr/src/sys/kern/kern_shutdown.c:555
#12 0xc07a1ef1 in witness_unlock (lock=0xc2fc3000, flags=8,
    file=0xc0b17d73 "/usr/src/sys/kern/vfs_mount.c", line=1317)
    at /usr/src/sys/kern/subr_witness.c:1284
#13 0xc0757324 in _lockmgr (lkp=0xc2fc3000, flags=6, interlkp=0x0,
    file=0xc0b17d73 "/usr/src/sys/kern/vfs_mount.c", line=1317)
    at /usr/src/sys/kern/kern_lock.c:430
#14 0xc07e3584 in dounmount (mp=0xc2fc3000, flags=524288, td=0xc2feccc0)
---Type <return> to continue, or q <return> to quit---
    at /usr/src/sys/kern/vfs_mount.c:1317
#15 0xc07e66be in vfs_unmountall () at /usr/src/sys/kern/vfs_subr.c:2935
#16 0xc0768adf in boot (howto=Variable "howto" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:399
#17 0xc07690fb in reboot (td=0xc2feccc0, uap=0xd614acfc)
    at /usr/src/sys/kern/kern_shutdown.c:172
#18 0xc0a79043 in syscall (frame=0xd614ad38)
    at /usr/src/sys/i386/i386/trap.c:1034
#19 0xc0a5f320 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:203
#20 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)

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