[arch-general] on reboot: systemd[1]: Started Generate shutdown-ramfs - hung (hard reset required)

[David C. Rankin]

All,

  After doing a system update today, I rebooted. The system hung on reboot
requiring a hard reset. It has never done this in the past (20 or so reboots).
Checking through the log I find:

Jan 16 12:43:19 phoinix systemd[1]: Stopping system-netctl.slice.
Jan 16 12:43:19 phoinix systemd[1]: Removed slice system-netctl.slice.
Jan 16 12:43:19 phoinix mysqld[311]: 140116 12:43:19  InnoDB: Shutdown
completed; log sequence number 7507539
Jan 16 12:43:20 phoinix mysqld[311]: 140116 12:43:20 [Note] /usr/bin/mysqld:
Shutdown complete
Jan 16 12:43:20 phoinix systemd[1]: Stopped MariaDB database server.
Jan 16 12:44:03 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:09 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:19 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:20 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:22 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:23 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:24 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:26 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:36 phoinix systemd[1]: Started Generate shutdown-ramfs.
Jan 16 12:44:38 phoinix systemd[1]: Started Generate shutdown-ramfs.
-- Reboot --

  So the box hung on shutdown at 12:44:03 and it just sat there until I did a
hard reset (pushed the reset button). Has anybody experienced a similar hang on
reboot? I welcome suggestions since this box is at a remote location and I need
to insure a clean remote reboot. What else to check?

-- 
David C. Rankin, J.D.,P.E.