Bug#501892: /etc/cron.daily/exim4-base exits with return code 123

[Florian Schlichting]

I think this is due to to an undead exim process failing to release the
lock on a particular db file. In /var/log/exim4/mainlog, you will see
frequent lines like "Failed to get write lock for
/var/spool/exim4/db/callout.lockfile: timed out". 'lsof | grep lockfile'
will also tell you something.

I stopped exim, killed all the remaining processes still waiting for the
lock, and in the end had to kill -9 the last (several days old)
receiving process. /etc/cron.daily/exim4-base then ran through without
problems.

Florian