Bug with shared access to mailbox

[Aki Tuomi]

On 30.05.2016 16:41, van der Kamp, John wrote:
> Hello,
>
> I'm testing dovecot with some setups, and one of them is with shared
> mailboxes. The test I wrote will create and delete mail using multiple
> connections to the same user and folder. Each connection makes a couple of
> mails, remembers the uid from APPENDUID, and will delete those emails again.
> At the end of the test I expect an empty folder.
>
> This is not what happens. At the end I still have several mails in the
> folder. I lack insight in the dovecot source to tell exactly what's going
> on. I've tested this with different setups:
> 1) local system user, connecting over localhost -> bug is present
> 2) local system user, connecting over internet -> bug is present, but is
> harder to reproduce
> 3) dovecot as proxy to another imap server -> bug is present
> In step 3, you can even setup a dovecot to be a proxy to another dovecot
> server.
>
>  From logging in the other imap server I've seen that a client command to the
> proxy like:
> TAG UID STORE 1:3 +FLAGS (\Deleted)
> TAG UID EXPUNGE 1:3
> will be sent to the other imap server in 3 steps, one for each message. When
> running the test with multiple threads, that logging shows that some uids
> are never sent to the other imap server, and some uids are sent over
> different connections than they original were sent to. (Thread 1 deletes
> 1:3, Thread 2 deletes 4:6, the proxy of Thread 1 might expunge messages from
> Thread 2 and vice versa).
>
> Attached is a python script which tests the behavior. The script expects a
> file named "testmail.eml" to upload to the imap server. I used an email
> which was about 75 kB.
> I tested using version: 2.2.22 (fe789d2).
> Let me know if I can help in any other way too.
>
> John
>
Hi!

We tested with 2.2.24, and were unable to reproduce the error. Can you 
try again with 2.2.24?

Aki