Thanks to Jaska Kivela, some patch formatting problems that caused the master.c process counting patch to not apply cleanly have been resolved. The patch set has been updated, and now also incorporates the master.c race condition patch:
http://jhoward.fastmail.fm/patches/cyrus/imap-diff.tgz The only file changed in the patch set is master-avail.diff . master-avail.diff solves the problem that master fails to correctly keep count of child processes if processes do not exit cleanly. This manifests itself as Cyrus failing to accept new connections on one or more ports after a while, when using preforking in imapd.conf.
