cannot poweroff debian/mips64el on qemu

When I do "poweroff" from debian/mips64el on qemu, qemu will hang in
the end, rather than quitting the process.  See the kernel messages
below. Last time when I tried 32bit debian/mipsel I was able to quit
qemu completely.  Any thoughts?

(No, I don't have "-no-shutdown" option in my qemu commandline.)

Jun

....
[  OK  ] Stopped Raise network interfaces.
[  OK  ] Stopped Apply Kernel Variables.
[  OK  ] Stopped target Local File Systems.
[  OK  ] Stopped target Local File Systems (Pre).
[  OK  ] Stopped Create Static Device Nodes in /dev.
[  OK  ] Stopped Create System Users.
[  OK  ] Stopped Remount Root and Kernel File Systems.
[  OK  ] Stopped Load Kernel Modules.
[  OK  ] Reached target Shutdown.
[  OK  ] Reached target Final Step.
[  OK  ] Started Power-Off.
[  OK  ] Reached target Power-Off.
[   79.830354] systemd-shutdow: 33 output lines suppressed due to ratelimiting
[   80.113620] systemd-shutdown[1]: Syncing filesystems and block devices.
[   80.252235] systemd-shutdown[1]: Sending SIGTERM to remaining processes...
[   80.317935] systemd-journald[144]: Received SIGTERM from PID 1
(systemd-shutdow).
[   80.393924] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[   80.427856] systemd-shutdown[1]: Unmounting file systems.
[   80.467625] [383]: Remounting '/' read-only in with options
'errors=remount-ro'.
[   80.490593] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro
[   80.508067] systemd-shutdown[1]: All filesystems unmounted.
[   80.508795] systemd-shutdown[1]: Deactivating swaps.
[   80.511447] systemd-shutdown[1]: All swaps deactivated.
[   80.512120] systemd-shutdown[1]: Detaching loop devices.
[   80.517216] systemd-shutdown[1]: All loop devices detached.
[   80.518078] systemd-shutdown[1]: Detaching DM devices.
[   80.564236] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[   80.565791] sd 0:0:0:0: [sda] Stopping disk
[   80.568175] reboot: System halted