Re: blocking shutdown?

[Jens Axboe <axboe@xxxxxxxxx>]

On 05/17/2012 10:50 AM, George Pang wrote:
> 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.

Sounds like the distro is buggy, then. Fio is nothing special. It'll
terminate on a signal, if sent TERM for instance. The only way that fio
would feasibly not die on shutdown would be if it's stuck
uninterruptibly in the kernel, due to an oops/crash or a bug.

-- 
Jens Axboe

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