Resolved Problem after upgrade (dovecot imap killed with signal 11)

[PawelK]

Server operating system version

Ubuntu 18.04.6 LTS

Plesk version and microupdate number

Plesk Obsidian 18.0.52

Hello,

After updating the server, I can't see the content of e-mail accounts. Mail to accounts arrives fine, but cannot be seen with imap.
I see in the logs:
serwer dovecot: service=imap, user=[email protected], ip=[any.ip.add.res]. Fatal: master: service(imap): child 20553 killed with signal 11 (core dumped).
I'm out of ideas.... No other errors, dovecot doesn't show errors when reloading

 

[GwenDragon]

Ubuntu 18 is very old and does not get updates anymore.

Ubuntu 18.04 EOL – keep your fleet of devices up and running | Ubuntu

Ubuntu 18.04 ‘Bionic Beaver’ is reaching End of Standard Support this May. If you don’t take action, you will transition to 18.04 EOL (End Of Life). This distribution of Ubuntu was installed by millions of users and powers up thousands of devices. From kiosks and appliances to IoT devices and...

ubuntu.com

Any no other syslog messages related to dovecot?

 

[Peter Debik]

The issue could be caused by an unsupported custom configuration of Dovecot. Some of such plugins are not supported in newer Dovecot versions anymore. When you have updated your server, it is possible that Dovecot was updated to a newer version that does not support the old plugins. Do you maybe have this file /etc/dovecot/conf.d/99-fts.conf? In that case, please edit the content. Leave this part:

protocol imap {
mail_plugins = "quota imap_quota fts fts_squat"
}

Remove plugins, e.g. remove a section like

plugin {
fts = squat
fts_squat = partial=4 full=10
fts_autoindex = yes
}

 

[PawelK]

Thanks for your help, I uninstalled dovecot, deleted the /etc/dovecot directory and reinstalled . Everything started. Case closed.