Solved. It appeared a configuration issue. There was a mismatch in the prefix of the namespace on both servers

Marc

Marc Weustink wrote:

Hi all,

To backup our imap folders I've a cronjob running in the night: /usr/bin/doveadm -o stats_writer_socket_path=  backup -R -A -N tcp:xxx.yyy.zzz:4191

This ran successful when I set it up and didn't look at it anymore. Recently I noticed errors:

dsync-local(administration): Panic: file dsync-mailbox-tree-sync.c: line 1253 (sync_create_mailboxes): assertion failed: (node->ns == other_node->ns) dsync-local(administration): Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0(+0xcceca) [0x7f7029099eca] -> /usr/lib/dovecot/libdovecot.so.0(+0xccf21) [0x7f7029099f21] -> /usr/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f7029006f44] -> /usr/bin/doveadm(+0x5206c) [0x558ba9fec06c] -> /usr/bin/doveadm(dsync_mailbox_trees_sync_init+0x2a2) [0x558ba9fedba2] -> /usr/bin/doveadm(dsync_brain_recv_mailbox_tree_deletes+0x246) [0x558ba9fdf6d6] -> /usr/bin/doveadm(dsync_brain_run+0x5b8) [0x558ba9fdbec8] -> /usr/bin/doveadm(+0x42260) [0x558ba9fdc260] -> /usr/bin/doveadm(+0x585bf) [0x558ba9ff25bf] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x69) [0x7f70290b2029] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x109) [0x7f70290b3959] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x52) [0x7f70290b2132] -> /usr/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f70290b2348] -> /usr/bin/doveadm(+0x27e39) [0x558ba9fc1e39] -> /usr/bin/doveadm(+0x2a3c7) [0x558ba9fc43c7] -> /usr/bin/doveadm(+0x2b1f6) [0x558ba9fc51f6] -> /usr/bin/doveadm(doveadm_mail_try_run+0x1fa) [0x558ba9fc597a] -> /usr/bin/doveadm(main+0x45b) [0x558ba9fb4ceb] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f702891a830] -> /usr/bin/doveadm(_start+0x29) [0x558ba9fb4e69] Aborted (core dumped)

I've added the dovecot repo to get dovecot automatically updated, so I cannot tell with which version it started.

my doveconf -n:

[sudo] password for infraadmin: # 2.3.3 (dcead646b): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.3 (f018bbab) # OS: Linux 4.4.0-137-generic x86_64 Ubuntu 16.04.5 LTS autofs # Hostname: xxx.xxx.xxx dict { acl = pgsql:/etc/dovecot/dovecot-dict-sql-local.conf.ext } doveadm_password = # hidden, use -P to show it mail_debug = yes mail_gid = vmail mail_home = /home/mail/backup/%n mail_location = maildir:/home/mail/backup/%n/mail mail_uid = vmail managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext 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 = separator = / type = private } namespace public { location = maildir:/home/mail/backup/Common/mail:INDEXPVT=/home/mail/backup/%n/mail/common

  prefix = Common/ separator = / subscriptions = no type = public } passdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql } plugin { acl = vfile acl_shared_dict = proxy::acl sieve = file:~/sieve;active=~/.dovecot.sieve } protocols = " sieve" service auth { unix_listener auth-userdb { mode = 0777 } } service dict { unix_listener dict { group = vmail user = vmail } } ssl = no userdb { args = /etc/dovecot/dovecot-sql.conf.ext driver = sql }