[Dovecot] Dovecot imap processes pinning CPU

[Timo Sirainen]

On Dec 13, 2008, at 3:40 AM, David Rosenstrauch wrote:

> In recent days, dovecot's "imap" processes keep getting stuck.  Each  
> time I check my server (running dovecot 1.1.7) there's a bunch of  
> "imap" processes (sometimes 2 of them, sometimes 4, sometimes 6)  
> that are using all of the box's CPU.
>
> And worse, there's no way to kill the processes either (neither kill  
> -15 or kill -9 works), which means that I wind up having to reboot  
> the box every time this happens.  REALLY irritating.

I wonder what's going on. You're the 3rd person who has started a  
thread about this within a few days. See the "unkillable imap  
process(es) with high CPU-usage" thread that's going on, with the  
exact same issue..
http://dovecot.org/list/dovecot/2008-December/035662.html

> I don't normally even *see* the imap processes in htop, as I think  
> they're pretty short lived.

Depends on the clients, but many clients keep IMAP connections open  
for a long time, so the imap processes should be long living.

What distribution and kernel version are you using?

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