BUG: Mailbox renaming algorithm got into a potentially infinite loop, aborting

[Timo Sirainen]

On 25 Sep 2019, at 17.03, Alex Ha via dovecot <dovecot at dovecot.org <mailto:dovecot at 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 at example.com <mailto:customer at 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 at example.com <mailto:customer at example.com>): Debug: brain M: -- Mailbox renamed, restart sync --
> dsync-local(customer at example.com <mailto:customer at example.com>): Error: BUG: Mailbox renaming algorithm got into a potentially infinite loop, aborting
> dsync-local(customer at example.com <mailto:customer at 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.

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