Re: dsync with vurtial folder leads to mess of msg ID

Greeting,

On Thu, 18 Apr 2024 17:51:06 +0200, Kirill A. Korinsky wrote:

All of this allows to reconstruct the workflow which leads to an issue:

1. mx2 had a new mail.
2. mx2 registered that mail as 147699 inside virtual folder.
3. by some reason this email wasn't replicated to mx1 for at least 30-40 seconds. Maybe it runs full-scan on all users, I have no idea.
4. mx1 had a new mail as well.
5. mx1 resitered that mail as 147699 inside virtual folder.
6. mx1's mail was replicated to mx2 as 147700
7. mx2's mail was replicated back to mx1 as 147701

I was wrong. I run a series of expirements and achived a strategy which allows to reproduce this issue.

I've used the following definition of virtual folder all:

• !Archive -Trash -Trash/* -Junk -Junk/* all

I also have two servers: mx1 and mx2.

So, to reproduce an issue with dsync msgid inside virtual folder I need:

1. Connect to mx1 via imap
2. Connect to mx2 via smtp
3. Initialize sending a mail via smtp
4. In parallel move some mail from Inbox to Virtual.All

With quite big probability I broke the order.

When I enable the debug log, it slow down things because dovecot and smtpd uses the same /var/log/maillog on my system.

Another way to avoid such condition, is switch off multi core on machine.

Without parallerism I can't reproduce the issue.

-- wbr, Kirill