You could try fix this by manually renaming the problematic folder. This is a bug though.

Aki

On 15.10.2019 17.29, Alex Ha via dovecot wrote:

Hi all! I'm using Dovecot 2.2.36.4. Maybe someone can help, this bug makes the replication unusable for me.

Thanks, Alex

On Wed, Sep 25, 2019 at 5:03 PM Alex Ha <alex.handle@gmail.com <mailto:alex.handle@gmail.com>> wrote:

Hi all!

I have two dovecot servers with dsync replication over tcp.
Replication works fine except for one user.

# doveadm replicator status
username                                                                                                
priority fast sync full sync success sync failed
customer@example.com
<mailto:customer@example.com>                                                                           
none     00:00:33  07:03:23  03:22:31     y

If i run dsync manually, i get the following error message:

dsync-local(customer@example.com <mailto:customer@example.com>):
Debug: brain M: -- Mailbox renamed, restart sync --
dsync-local(customer@example.com <mailto:customer@example.com>):
Error: BUG: Mailbox renaming algorithm got into a potentially
infinite loop, aborting
dsync-local(customer@example.com <mailto:customer@example.com>):
Error: Mailbox INBOX.Foldername sync: mailbox_rename failed:
Invalid mailbox name 'Foldername-temp-1': Missing namespace prefix
'INBOX.'

For more info see the attached sync_loop.log

Thanks for your help,

Alex

On Wed, Oct 16, 2019 at 4:55 PM Timo Sirainen <timo@sirainen.com> wrote:

On 25 Sep 2019, at 17.03, Alex Ha via dovecot <dovecot@dovecot.org> wrote:

Hi all!

I have two dovecot servers with dsync replication over tcp. Replication works fine except for one user.

# doveadm replicator status username priority fast sync full sync success sync failed customer@example.com none 00:00:33 07:03:23 03:22:31 y

If i run dsync manually, i get the following error message:

dsync-local(customer@example.com): Debug: brain M: -- Mailbox renamed, restart sync -- dsync-local(customer@example.com): Error: BUG: Mailbox renaming algorithm got into a potentially infinite loop, aborting dsync-local(customer@example.com): Error: Mailbox INBOX.Foldername sync: mailbox_rename failed: Invalid mailbox name 'Foldername-temp-1': Missing namespace prefix 'INBOX.'

I've never fixed this because I haven't figured out how to reproduce it. If it happens with you all the time, could you try:

• Get a copy of both replica sides, e.g. under /tmp/replica1 and /tmp/replica2
• Make sure dsync still crashes with them, e.g. doveadm -o mail=maildir:/tmp/replica1 sync maildir:/tmp/replica2
• Delete all mails and dovecot.index* files (but not dovecot.mailbox.log)
• Make sure dsync still crashes
• Send me the replicas - they should no longer contain anything sensitive

As for fixing, you could see if deleting dovecot.mailbox.log from both replicas happens to fix this.

Unfortunatley deleting dovecot.mailbox.log on both replicas did not fix the problem.

Alex