LMTP-Process stays in RCPT TO state

[Pascal Christen]

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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://dovecot.org/pipermail/dovecot/attachments/20191005/fb588b8b/attachment.html>