[Dovecot] Strange Error after some hour of inactivity.

[Ramunas]

Hi Timo,
thanks for your reply. I realy want use Dovecot on our e-mail server, but 
still same problem "invalid I/O fd 8, callback 0x80645f0".
New callback address from previuous post, because upgraded gcc :)

>From log file:
Jun 11 20:53:25 srv1 dovecot: Dovecot v1.0.beta8 starting up
Jun 11 20:53:26 srv1 dovecot: auth(default): pgsql: Connected to hosting
Jun 11 20:53:29 srv1 dovecot: pop3-login: Login: user=<ramas>, method=PLAIN, 
rip=192.168.0.3, lip=192.168.0.6, TLS
Jun 11 20:53:29 srv1 dovecot: POP3(ramas): Disconnected: Logged out top=0/0, 
retr=0/0, del=0/0, size=0
Jun 11 20:53:40 srv1 dovecot: imap-login: Login: user=<ramas>, method=PLAIN, 
rip=127.0.0.1, lip=127.0.0.1, secured
Jun 11 20:53:40 srv1 dovecot: IMAP(ramas): Disconnected: Logged out
Jun 11 20:53:41 srv1 dovecot: imap-login: Login: user=<ramas>, method=PLAIN, 
rip=127.0.0.1, lip=127.0.0.1, secured
Jun 11 20:53:41 srv1 dovecot: IMAP(ramas): Disconnected: Logged out
Jun 11 20:53:41 srv1 dovecot: imap-login: Login: user=<ramas>, method=PLAIN, 
rip=127.0.0.1, lip=127.0.0.1, secured
Jun 11 20:53:41 srv1 dovecot: IMAP(ramas): Disconnected: Logged out
Jun 11 23:00:37 srv1 dovecot: auth(default): sql(ramas,192.168.0.3): 
Password query failed:
Jun 11 23:00:37 srv1 dovecot: auth(default): invalid I/O fd 8, callback 
0x80645f0
Jun 11 23:01:37 srv1 dovecot: pop3-login: Disconnected: Inactivity: 
method=PLAIN, rip=192.168.0.3, lip=192.168.0.6, TLS
Jun 11 23:08:08 srv1 dovecot: pop3-login: Disconnected: Inactivity: 
method=PLAIN, rip=192.168.0.3, lip=192.168.0.6, TLS
Jun 11 23:09:32 srv1 dovecot: pop3-login: Disconnected: Inactivity: 
method=PLAIN, rip=192.168.0.3, lip=192.168.0.6, TLS
Jun 11 23:20:01 srv1 last message repeated 7 times

Output from gdb:

[root at srv1 /]# gdb /usr/libexec/dovecot/pop3-login
GNU gdb Red Hat Linux (6.3.0.0-1.122rh)

(gdb) x 0x80645f0
0x80645f0:      Cannot access memory at address 0x80645f0
(gdb)

[root at srv1 /]# gdb /usr/libexec/dovecot/imap-login
(gdb) x 0x80645f0
0x80645f0:      Cannot access memory at address 0x80645f0
(gdb)

[root at srv1 /]# gdb /usr/libexec/dovecot/dovecot-auth

(gdb) x 0x80645f0
0x80645f0 <get_result>: 0x83e58955
(gdb)

>Could you get the gdb backtrace for it?
>It should have written core file to /var/run/dovecot (or wherever your
>base_dir is). If not, you probably need to do "ulimit -c unlimited"
>before starting Dovecot.
Core file not found, "ulimit -c unlimited" done.

But maybe this will be usefull:
[root at srv1 log]# gdb /usr/libexec/dovecot/dovecot-auth 23127

0xffffe410 in __kernel_vsyscall ()
(gdb) bt

#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7df6e3e in __lll_mutex_lock_wait () from /lib/libc.so.6
#2  0xb7d7694c in _L_lock_100 () from /lib/libc.so.6
#3  0xb7d768ea in fflush () from /lib/libc.so.6
#4  0xb7e65973 in pqFlush () from /usr/lib/libpq.so.3
#5  0xb7e62cb0 in PQconsumeInput () from /usr/lib/libpq.so.3
#6  0x0806460c in get_result ()
#7  0x0806a008 in io_loop_handler_run ()
#8  0x080696ac in io_loop_run ()
#9  0x08058a85 in main ()
(gdb)

>Did you configure Dovecot with --ioloop=epoll? I think there have been
>some problems with that, which might be related.

Configured with:
--disable-ipv6
--with-notify=inotify
--with-ldap
--with-pgsql
--with-ssl=openssl
--with-ssldir=/etc/pki/dovecot
--with-gssapi
--with-static-userdb
--with-prefetch-userdb
--with-storages="maildir,mbox"

Also tryed --with-ioloop=epoll, got another error but i think its the same 
problem.

>From log file (with option --with-ioloop=epoll):
Jun 11 08:43:10 srv1 dovecot: pop3-login: Login: user=<ramas>, method=PLAIN, 
rip=192.168.0.3, lip=192.168.0.6, TLS
Jun 11 08:43:18 srv1 dovecot: auth(default): io_loop_handle_add: 
epoll_ctl(3, 9): No such file or directory
Jun 11 08:43:18 srv1 dovecot: pop3-login: Disconnected: method=PLAIN, 
rip=192.168.0.3, lip=192.168.0.6, TLS
Jun 11 08:43:18 srv1 dovecot: child 32063 (auth) returned error 89