Slavek,
One more issue with the tdeio_slaves failing to close is if kmail is left open, the automatic checks for new mails done every 10 minutes or so, will cause the mail server to begin rejecting connections after its anvil connection limit is reached (due to the imap connections never being closed):
This was from my mail server after I began getting imap connection rejects: (all of those logins are from kmail that are stuck open)
953 ? Ss 0:29 /usr/sbin/dovecot 1087 ? S 0:05 _ dovecot/anvil 1088 ? S 0:05 _ dovecot/log 15680 ? S 0:09 _ dovecot/config 31108 ? S 0:05 _ dovecot/imap-login 31112 ? S 0:11 _ dovecot/imap 1022 ? S 0:04 _ dovecot/imap-login 1026 ? S 0:06 _ dovecot/imap 20731 ? S 0:01 _ dovecot/imap-login 20737 ? S 0:02 _ dovecot/imap 21919 ? S 0:00 _ dovecot/imap-login 21921 ? S 0:01 _ dovecot/imap 23254 ? S 0:00 _ dovecot/imap-login 23255 ? S 0:01 _ dovecot/imap 25991 ? S 0:00 _ dovecot/imap-login 25993 ? S 0:01 _ dovecot/imap 32553 ? S 0:00 _ dovecot/imap-login 32557 ? S 0:01 _ dovecot/imap 15881 ? S 0:00 _ dovecot/imap-login 15883 ? S 0:00 _ dovecot/imap 16677 ? S 0:00 _ dovecot/imap-login 16678 ? S 0:00 _ dovecot/imap 19776 ? S 0:00 _ dovecot/imap-login 19780 ? S 0:00 _ dovecot/imap 23531 ? S 0:00 _ dovecot/imap-login 23535 ? S 0:00 _ dovecot/imap 23537 ? S 0:00 _ dovecot/imap-login 23538 ? S 0:00 _ dovecot/imap 1039 ? Ss 0:00 /usr/sbin/faxq