[Dovecot] backup maildir mailbox bugs

[Timo Sirainen]

On 26.10.2013, at 18.23, Timo Sirainen <tss at iki.fi> wrote:

> On 20.10.2013, at 19.24, Anand Kumria <wildfire at progsoc.org> wrote:
> 
>> Using dovecot v2.2.5.5, I get the following:
>> 
>> $ doveadm -v backup -R -u user at example.com maildir:/home/rsync/
>> example.com/user/Maildir/
>> 
>> [...]
>> 
>> dsync(user at example.com): Panic: file dsync-mailbox-export.c: line 228
>> (export_save_change_get): assertion failed: (change->type ==
>> DSYNC_MAIL_CHANGE_TYPE_FLAG_CHANGE)
> 
> That’s definitely a bug, but I’m not sure how to reproduce it. Can you create such a test maildir where this happens that you could send to me? For example you could change all the mail contents to just use “x” letters. Here’s a script that does it: http://dovecot.org/tools/maildir-anonymize.pl
> 
> Most likely this is related to your specific dovecot.index* files, and deleting them would fix the problem. I’d still like to fix the real bug though.

I don’t see why it would repeatedly happen, although I did find a bug that could cause that behavior during race conditions:
http://hg.dovecot.org/dovecot-2.2/rev/dbe7c5a0021e