[Dovecot] Dovecot causing hanging on random folders...

[Rick Flower]

I've been using the 1.0 test series (currently 1.0test 67 and before 
that 1.0-test59) and both exhibited this issue.. I use Thunderbird and 
will open one or two of my nested Maildir folders via imap and find that 
it goes out there trying to open the folder (according to the messages 
that Thunderbird claims) and it never comes back.. I've attached to the 
various dovecot processes to see what their doing and they appear to be 
waiting for things to do -- e.g. not working on anything in particular.. 
The only way to fix this is to quit Thunderbird and restart it..  I see 
this about 2-3 times a day.. I'd love to track it down.. I've seen this 
on Fedora Core 1 (i386 server) and also on a PPC Linux system running an 
older kernel (on a Buffalo Linkstation if you know what that is)..

Below is the current set of dovecot processes running on my FC1 box :

[rickf at srv1 dovecot-1.0-test67]# ps aux | grep dove
root       748  0.0  0.0  3380  720 ?        S    11:30   0:00 dovecot-auth
dovecot    749  0.0  0.0  2440  668 ?        S    11:30   0:01 imap-login
dovecot    760  0.0  0.0  2788  700 ?        S    11:30   0:01 imap-login
root       709  0.0  0.0  2312  688 ?        S    11:30   0:13 
/usr/dovecot/sbin/dovecot

I'd be happy to track this down if someone can point me in the right 
direction..

-- Rick