[Dovecot] Dovecot lock problem

[Timo Sirainen]

On Tue, 2009-10-13 at 11:37 -0700, Simon Gao wrote:
> We have a few users experiencing locking problem. When starting 
> Thunderbird, there is no new emails in Inbox. Dovecot createa a lock file 
> /var/spool/mail/<user>.lock. It never completes openning Inbox. If closing 
> the mail client, the open imap session does not get closed, nor the lock 
> file get deleted.

What is the process doing? Check with "strace -p <imap process pid>"?
How large is the user's mailbox?

> Here are the errors in log:
> 
> dovecot: Oct 13 11:18:35 Warning: IMAP(user1): Our dotlock file 
> /var/mail/user1.lock was deleted (kept it 88 secs)
> dovecot: Oct 13 11:18:35 Error: IMAP(user1): file_dotlock_delete() 
> failed with mbox file /var/mail/user1: No such file or directory

I'd guess this is a huge mbox (or your disk I/O is very slow) and
Dovecot takes a long time trying to read it. mbox_very_dirty_syncs=yes
may be helpful.
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