Fwd: Dsync replication - delayed replication (Sync lock)

[Claudio Corvino]

Hi,

we have the same issue and the same configuration except for Dovecot 
version, ours is the latest into Dovecot repo; in addition we do not 
have DNS round robin.

Does anybody have a solution?

Kind regards

On 07/09/20 15:53, Daniel Botting wrote:
>
> Dear Sirs,
>
> Further to my last email have any list members seen this before and 
> are able to offer advice on how to resolve this please.
>
> I should note as well that we are running Dovecot from the upstream 
> Debian packages at https://repo.dovecot.org/ce-2.3-latest/debian/buster .
>
> Kind regards
>
> Daniel
>
>
>
> -------- Forwarded Message --------
> Subject: 	Dsync replication - delayed replication (Sync lock)
> Date: 	Tue, 1 Sep 2020 16:17:15 +0100
> From: 	Daniel Botting <daniel.botting at codethink.co.uk>
> To: 	dovecot at dovecot.org
>
>
>
> Hi,
>
> *Our setup:*
>
> Two Debian 10 machines that are setup to replicate mail between them, 
> we have round robin DNS setup so a user can connect to either server.
>
> *What should happen:*
>
> Mail is delivered to either server and replicated across straight away 
> to their mailbox on the other server so it does not matter which one 
> they are connected to they will receive it fairly soon after delivery.
>
> *What actually happens:*
>
> In some instances the user will experience a delayed receipt of 
> messages if they are not connected to the server that the message is 
> initially delivered to, sometimes the delay is 5/10 minutes, we had a 
> recent support ticket submitted where it was over an hour.
>
> Error message seen in mail.err:
>
> Sep  1 10:16:15 <host name> dovecot: 
> dsync-local(<username>)<WELSGEERTl8FEAAAZJ7A9A>: Error: Couldn't lock 
> /path/to/mailbox/.dovecot-sync.lock: 
> fcntl(/path/to/mailbox/.dovecot-sync.lock, write-lock, F_SETLKW) 
> locking failed: Timed out after 30 seconds (WRITE lock held by pid 3697)
>
> Process 3697 is dovecot/doveadm-server.
>
> *Doveconf -n output:*
>
> # 2.3.10.1 (a3d0e1171): /etc/dovecot/dovecot.conf
> # Pigeonhole version 0.5.10 (67bf5bd7)
> # OS: Linux 4.19.0-10-amd64 x86_64 Debian 10.5
> # Hostname: <server hostname>
> auth_verbose = yes
> default_vsz_limit = 0
> doveadm_password = # hidden, use -P to show it
> first_valid_gid = 8
> first_valid_uid = 8
> last_valid_gid = 8
> last_valid_uid = 8
> lda_mailbox_autocreate = yes
> lda_mailbox_autosubscribe = yes
> mail_gid = 8
> mail_location = maildir:~/Maildir
> mail_plugins = " notify replication"
> mail_uid = 8
> managesieve_notify_capability = mailto
> managesieve_sieve_capability = fileinto reject envelope 
> encoded-character vacation subaddress comparator-i;ascii-numeric 
> relational regex im
> ap4flags copy include variables body enotify environment mailbox date 
> index ihave duplicate mime foreverypart extracttext editheader imapfla
> gs
> namespace inbox {
>   inbox = yes
>   location =
>   mailbox Drafts {
>     special_use = \Drafts
>   }
>   mailbox Junk {
>     special_use = \Junk
>   }
>   mailbox Sent {
>     special_use = \Sent
>  }
>   mailbox "Sent Messages" {
>     special_use = \Sent
>   }
>   mailbox Trash {
>     special_use = \Trash
>   }
>   prefix =
> }
> passdb {
>   args = /etc/dovecot/dovecot-ldap.conf.ext
>   driver = ldap
> }
> plugin {
>   mail_replica = tcps:<server being replicated to>:<port being used>
>   sieve = ~/.dovecot.sieve
>   sieve_dir = ~/sieve
>   sieve_extensions = +editheader +imapflags
> }
> postmaster_address = postmaster@<domain address>
> protocols = " imap sieve pop3"
> replication_max_conns = 12
> service aggregator {
>   fifo_listener replication-notify-fifo {
>     user = mail
>   }
>   unix_listener replication-notify {
>     user = mail
>   }
> }
> service auth {
>   unix_listener /var/run/dovecot-exim-bridge {
>     mode = 0660
>     user = Debian-exim
>   }
> }
> service doveadm {
>   inet_listener {
>     port = <port being used for replication>
>     ssl = yes
>   }
> }
> service imap-login {
>   inet_listener imap {
>     port = 143
>   }
>   }
>   inet_listener imaps {
>     port = 993
>     ssl = yes
>   }
>   process_limit = 512
>   process_min_avail = 4
>   service_count = 1
> }
> service imap {
>   process_limit = 1024
> }
> service managesieve-login {
>   inet_listener sieve {
>     port = <sieve port>
>   }
>   process_min_avail = 1
>   service_count = 8
>   vsz_limit = 256 M
> }
> service managesieve {
>   process_limit = 1024
> }
> service replicator {
>   process_min_avail = 1
>   unix_listener replicator-doveadm {
>     mode = 0666
>   }
> }
> ssl = required
> ssl_cert = </path/to/ssl/cert/fullchain.pem
> ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL
> ssl_client_ca_dir = /etc/ssl/certs
> ssl_key = # hidden, use -P to show it
> ssl_min_protocol = TLSv1.2
> userdb {
>   args = /etc/dovecot/dovecot-ldap.conf.ext
>   driver = ldap
>   override_fields = home=/var/mail/%u uid=mail gid=mail
> }
> protocol lda {
>   mail_plugins = " notify replication sieve"
> }
> protocol imap {
>   mail_max_userip_connections = 32
>   mail_plugins = " notify replication"
> }
> protocol sieve {
>   mail_max_userip_connections = 10
>   managesieve_logout_format = bytes=%i/%o
>   managesieve_max_line_length = 65536
> }
>
> Kind regards
>
> Daniel
>
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