Cyrus POP3 Deadlocks in 2.1.16

Andrew Morgan morgan at
Mon Sep 27 13:05:23 EDT 2004

On Mon, 27 Sep 2004, Michael Loftis wrote:

> --On Monday, September 27, 2004 18:14 +0200 Simon Matter
> <simon.matter at> wrote:
> > Is this POP3 or POP3/TLS?
> All POP3 services, and only POP3 services.  Complete deadlock until a
> system reboot.    I'll check and turn off APOP as Ken Murchison suggested
> but I don't think that's it, if it was, a 5 minute shutdown should get it
> back, and you'd expect atleast SOME clients to get through, but once it
> starts absolutely NO POP3 connections succeed, the banner never happens.
> I don't recall if POP3/TLS or POP3/SSL make it through the negotiations, it
> has been a while since I bothered to check that, indeed been a while since
> we've had the deadlock itself, but we had it this AM nonetheless.
> Again, I appreciate any helpful comments or anythign anyone may
> have....I'll turn off the allowapop setting (should be off anyway since we
> use crypt-ed LDAP passwords) and atch it.
> I can't reproduce it reliably anyway so...

To find out where it is getting stuck, you might want to look into running
strace/truss on one of the pop3 processes.  Also, the output of lsof may
be helpful if there is a file lock that multiple processes are waiting

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