Hello,
I recently upgraded a Dovecot install from 2.3.20 to 2.3.21 from the 2.3-latest repository ( http://repo.dovecot.org/ce-2.3-latest/rhel/$releasever/RPMS/$basearch )
However since then, I seem to be getting: Jan 13 01:08:32 mail01 dovecot[3646235]: imap-login: Login: user=user@example.com, method=PLAIN, rip=35.243.xxx.xxx, lip=176.9.xxx.xxx, mpid=3646265, TLS, session=<o9jJlMgOFzMj86dT> Jan 13 01:09:03 mail01 dovecot[3646235]: imap-hibernate: Error: conn unix:imap-hibernate (pid=3646265,uid=1010): IMAP client fd not received Jan 13 01:09:03 mail01 dovecot[3646235]: imap(user@example.com)<3646265><o9jJlMgOFzMj86dT>: Error: Couldn't hibernate imap client: /run/dovecot/imap-hibernate disconnected
This seems to be the case for every email-account on the system.
Related configs:
20-imap.conf: protocol imap { imap_hibernate_timeout = 30s
imap_idle_notify_interval = 24 mins
mail_plugins = $mail_plugins imap_quota quota_clone zlib fts fts_solr
mail_max_userip_connections = 20 }
10-master.conf: service imap { # Most of the memory goes to mmap()ing files. You may need to increase this # limit if you have huge mailboxes. #vsz_limit = $default_vsz_limit
unix_listener imap-master { user = $default_internal_user } extra_groups = $default_internal_group }
service imap-hibernate { unix_listener imap-hibernate { mode = 0660 group = $default_internal_group } }
10-metrics.conf event_exporter log { format = json format_args = time-rfc3339 transport = log }
metric hibernation_logging { exporter = log filter = event=imap_client_hibernated OR event=imap_client_unhibernated }
socket:
$ stat /run/dovecot/imap-hibernate File: /run/dovecot/imap-hibernate Size: 0 Blocks: 0 IO Block: 4096 socket Device: 19h/25d Inode: 48551407 Links: 1 Access: (0660/srw-rw----) Uid: ( 0/ root) Gid: ( 97/ dovecot) Context: system_u:object_r:dovecot_var_run_t:s0 Access: 2024-01-13 01:03:07.432084831 +0100 Modify: 2024-01-13 00:50:56.394662577 +0100 Change: 2024-01-13 00:50:56.394662577 +0100 Birth: -
From the change log, I see the following:
- imap-hibernate: If an IMAP client unhibernation timed out with
"(version received)", the unhibernation could still have successfully
finished later on and continued working normally. This was rather
confusing, because imap-hibernate already logged that the client got
disconnected. Avoid this by forcing the connection to shutdown on
unhibernation timeout.By the looks of it, it seems hibernation never actually happens anymore as of the new version. Downgrading to version 2.3.20 again seems to make hibernation function again based on the event logs.
In 2.3.21 I only see events being logged for imap_client_hibernated which matches the /run/dovecot/imap-hibernate disconnected:
"error":"/run/dovecot/imap-hibernate disconnected"
In 2.3.20 I get both imap_client_hibernated and imap_client_unhibernated events (that it happens and when idle_done is triggered).
Thank you in advance!