[Dovecot] 2.1: timeout waiting for lock?

[Timo Sirainen]

On Thu, 2012-03-15 at 11:44 +0100, Ralf Hildebrandt wrote:
> Mar 15 09:46:11 postamt dovecot: pop3(username): Error: Couldn't open INBOX: Timeout while waiting for lock
> Mar 15 09:46:11 postamt dovecot: pop3(username): Couldn't open INBOX top=0/0, retr=0/0, del=0/0, size=0
> 
> during that time, I wasn't able to access the mailbox using imap. I
> then issued

Maildir?

> doveadm kick username
> 
> and all over sudden the mailbox was accessible (via IMAP)

So one of them had the INBOX locked. Do you have pop3_lock_session=yes?