[tpop3d-discuss] has anyone seen such behaviour with tpop3d 1.5.1? (hanging)

[Arkadiusz Miskiewicz]

The problem is that tpop3d after working for a while hangs. I mean new 
connection seems be accepted but nothing more happens:

address@hidden arekm]$ telnet myhost.pl pop3
Trying xx.110...
Connected to myhost.pl.
Escape character is '^]'.
(and hangs here)

on server processes looks like this
address@hidden root]# ps ax -O wchan | grep tpop
 8568 schedu S ?        00:00:03 /usr/sbin/tpop3d -f /etc/tpop3d.conf
17345 schedu S ?        00:00:01 /usr/sbin/tpop3d -f /etc/tpop3d.conf
19009 schedu S ?        00:00:00 /usr/sbin/tpop3d -f /etc/tpop3d.conf
19013 schedu S ?        00:00:00 /usr/sbin/tpop3d -f /etc/tpop3d.conf

Server has load ~ 1.0.

Config:
listen-address: 
0.0.0.0(host.pl);tls=stls,/etc/openssl/certs/host.crt,/etc/openssl/certs/host.key
 
\                 
0.0.0.0(host.pl);tls=immediate,/etc/openssl/certs/host.crt,/etc/openssl/certs/host.key

append-domain: yes
auth-pam-enable: no
auth-passwd-enable: no
auth-mysql-enable: yes
auth-mysql-mail-group: mail
auth-mysql-database: sys_
auth-mysql-hostname: db.host.pl
auth-mysql-username: user
auth-mysql-password: pass
auth-mysql-pass-query: SELECT 
'/var/mail/$(local_part)',concat('{plaintext}',user.passwd),'mail','bsd' FROM 
user LEFT JOIN
user_pop ON user.id=user_pop.id WHERE user.login='$(local_part)' AND 
user.active=1 AND user_pop.active=1

It's tpop3d 1.5.1 with fork fix patch applied from cvs 
(http://cvs.pld-linux.org/cgi-bin/cvsweb/SOURCES/tpop3d-fork.patch?rev=1.1).

The problem is that I can't trace it down since it's production system. For 
now I've downgraded tpop3d to 1.4.2. Note that 1.4.2 doesn't hang.

Has anyone seen similar behaviour on Linux (2.4.21 with O(1) scheduler, glibc 
2.2.5)?
-- 
Arkadiusz Miśkiewicz    CS at FoE, Wroclaw University of Technology
arekm.pld-linux.org AM2-6BONE, 1024/3DB19BBD, arekm(at)ircnet, PLD/Linux