The rest of your log seems to be doing the right thing. Here in the first part,
the plugin's clearly recognising this is a new ip address, but it looks as if
the write to the db is failing somehow. It's not a locking issue - the lock is
already held at this point.
So I'm not sure why this is failing - could you have been out of disk space or
something? What's the expected behaviour on a dbm tied write in this kind of
situation (e.g. out of disk space)? Should it die or does it just fail via
return code? Line in question is:
$db{$key} = sprintf $fmt, time, ++$new, $black, 0;
FWIW I've had very "weird" stability issues with db files of all varieties (even DB_File). Especially under extreme load. I've had much better success with SQLite.
