On 05/10/2019 13:01, Pascal Christen via dovecot wrote:
Hi
We tried to update our Dovecot Director-Ring to 2.3 (latest version)
and had one problem/bug. When we try to deliver an email from Exim to
a receiving Dovecot (2.3 latest) via the LMTP-Proxy the LMTP process
stays open forever and never closes. So after a few hours, we hit the
LMPT-Process limit.
The problem only exists if the receiving Dovecot reports "Quota
exceeded (mailbox for user is full)" back to the Exim. If this is the
case the state on the LMPT process stays at "lmtp: [_IP_ RCPT TO]
(lmtp) and never closes. The TCP-Connection to the Exim is then in
CLOSE_WAIT state on the Proxy. On the receiving Dovecot we set the
"lmtp_rcpt_check_quota=yes" option. For me, it sounds similar to this
bug: https://dovecot.org/list/dovecot/2018-January/110697.html but
without the SEGFAULT which makes it harder to debug it.
May you guys know why it doesn't change the state to IDLE or READY
after reporting the quota issue or see something fishy in the commit
above. If not I try to get a trace of the hanging process.
Greetings Pascal
So far, I haven't been able to reproduce anything weird at this end. Can
you provide:
- Output from `dovecot -n'
- Protocol logs from the connections between Exim and Dovecot
director/proxy and between Dovecot director/proxy and Dovecot backend
(e.g. using ngrep when connections are plaintext or using the rawlog
facility).
- Dovecot debug logs produced with `log_debug=category:lmtp' for both
director/proxy and backend
Regards,
Stephan.
