One more attempt: stuck processes

[Sebastian Hagedorn]

--On 16. November 2007 11:27:52 -0500 Ken Murchison <murch at andrew.cmu.edu> 
wrote:

> Sebastian Hagedorn wrote:
>
>> The only reason I could imagine for the sequence of calls was signal
>> handling. But let's be methodical. There's only one spot where
>> SSL_accept() is called: in tls_start_servertls(). In pop3d.c that's only
>> called in cmd_starttls(). That in turn is called either in cmdloop (for
>> handling of STLS) or in service_main() for connections to port 995.
>
> Actually, now that I think about it, I believe SSL_accept() can be called
> from SSL_read() at any time if a renegotiation is required. Since
> shut_down() calls prot_fill(), which in turn can call SSL_read(), its
> possible that we can get an SSL_accept() call.  Before I start hacking
> code, can you apply the following patch (sorry about the line breaks) and
> see if I'm heading in the right direction?  Let me know if you get any of
> the WARNING messages in your logs.
>
>
> --- prot.c.~1.93.~	2007-11-16 11:21:56.000000000 -0500
> +++ prot.c	2007-11-16 11:23:32.000000000 -0500
> @@ -468,6 +468,7 @@
>   	    /* just do a SSL read instead if we're under a tls layer */
>   	    if (s->tls_conn != NULL) {
>   		n = SSL_read(s->tls_conn, (char *) s->buf, PROT_BUFSIZE);
> +		if (n <= 0) syslog(LOG_WARNING, "SSL_read() returned %d", n);
>   	    } else {
>   		n = read(s->fd, s->buf, PROT_BUFSIZE);
>   	    }

Yes, I do:

Nov 16 17:59:34 lvr13 pop3s[3196]: SSL_read() returned 0
Nov 16 17:59:38 lvr13 pop3s[3196]: SSL_read() returned 0
Nov 16 18:00:09 lvr13 pop3s[3215]: SSL_read() returned 0
Nov 16 18:00:26 lvr13 pop3s[3847]: SSL_read() returned 0
Nov 16 18:00:34 lvr13 pop3s[3215]: SSL_read() returned 0
Nov 16 18:00:34 lvr13 pop3s[3199]: SSL_read() returned 0
Nov 16 18:00:39 lvr13 pop3s[3199]: SSL_read() returned 0
Nov 16 18:00:43 lvr13 pop3s[3229]: SSL_read() returned 0

Not all of these processes are stuck, though. (Maybe none are). Should I be 
looking for something specific?
-- 
     .:.Sebastian Hagedorn - RZKR-R1 (Gebäude 52), Zimmer 18.:.
Zentrum für angewandte Informatik - Universitätsweiter Service RRZK
.:.Universität zu Köln / Cologne University - ✆ +49-221-478-5587.:.
                   .:.:.:.Skype: shagedorn.:.:.:.
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