blocking shutdown?

[George Pang <xilvar@xxxxxxxxx>]

I've been configuring a server for a colocation recently using ubuntu
12.04 desktop (the server dist dislikes my only keyboard) and I
noticed that if I am running an fio test and I initiate a shutdown the
shutdown kills off everything as usual, but fio appears to keep
running and block shutdown. (from either the desktop ui or with
"shutdown now")

Thus on a remote server any user with privileges to run fio could
accidentally, or maliciously prevent system shutdown from completing,
effectively taking a server out of service until physical access was
achieved.

George
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