Inconsistent mdbox index while running doveadm altmove

[Timo Sirainen]

On 29 Feb 2016, at 23:31, Ricardo Machini Barbosa <ricardomachini at gmail.com> wrote:
> 
> Hello,
> 
> I was performing doveadm altmove for one account while this mailbox was
> being accessed.
> 
> 
> 
> Dovecot version: 2.2.21
> 
> Mailbox format: mdbox
> 
> 
> 
> Command:
> 
> doveadm altmove -u user1 at domain.com.br before 360d

Was it the first time you ran it for this user?

> This command took about 5 minutes to finish and during the execution I found
> some log messages:
> 
> 
> 
> Feb 25 19:57:51 dovecot: imap(user1 at domain.com.br): Error: mdbox map
> /var/mail/user1/mdbox/storage/dovecot.map.index corrupted: Unexpectedly lost
> INBOX uid=77 map_uid=76

It's not necessarily the altmove that broke this. It could have just noticed this existing problem.

> After that these messages moved to alternate storage disappeared from the
> mailbox/IMAP but these files were all on alternative storage.
> 
> I had to execute doveadm force-resync -u user1 at domain.com.br INBOX to
> recovery this mailbox, but losing all e-mail's flags.

This again shouldn't happen..

> I should do some kind of lock before running the command altmove ?

No. I attempted to reproduce this with some stress testing, but wasn't able to.