[Dovecot] Stale imap processes

Renaud Allard renaud at llorien.org
Wed Aug 2 18:46:43 EEST 2006

>> Unfortunately, I had the problem on OpenBSD with dovecot 1.0rc2. Stale
>> imap processes when _NOT_ using kqueue (using poll). Using kqueue solved
>> the problem. Not sure if it's the same on FreeBSD, but it seems that
>> using kqueue solves the stale processes problem both on OpenBSD and
>> NetBSD. On linux, kqueue doesn't produce stale imap processes either.
> I have had a number of reports that kqueue, specifically kqueue for
> the file change mechanism (--with-notify=kqueue), causes the hanging
> and disabling this allowed regular operation. kqueue for the I/O loop
> mechanism causes dovecot processes to crash under certain (unknown)
> conditions. If poll is causing problems then there are definitely some
> nasty bugs lurking in the code base. The problem with the file change
> mechanism and kqueue popped up somewhere between beta8 and rc2.

I use --with-ioloop=kqueue
I had no problems with beta8, and noticed stale imap processes after
upgrading to rc2. Someone suggested using --with-ioloop=kqueue and this
indeed solved my problem.
Note that while I have no more imap processes hanging, I noticed that
sometimes thunderbird complains about being unable to copy mails in sent
folder. This wasn't the case in beta8.



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