Dear Maintainer,

at some point after upgrading, we found that imagemagick commands hang for
extended periods of time without any activity.

strace showed the reason to be it trying to connect to the local irc
server (running on port 6668), waiting for some specific response.

as it turns out, this is due to the distributed pixel cache feature of
imagemagick.

I think there are a number of problems with that:

1) imagemagick should not try to connect a distributed pixel cache
   that isn't configured.
2) it definitely shouldn't use a port used by a well-known protocol,
   in this case, irc (which uses ports 6660-6669 or higher for decades).

Arguably, 1) is a security issue, as any local user can bind to port
6668, and this might unexpectedly leak personal data, as the shared
secret in debian is not per-user and stored in a world-readable file
(/etc/ImageMagick-6/policy.xml) and apparently defaults to "passphrase".