On 10/21/2010 06:42 PM, Timo Sirainen wrote:

auth process is hanging or imap-login is connecting to wrong server.

First try deleting everything from Dovecot's base_dir (/var/run/dovecot/ or something). Deleted everythind under that folder. Didn't help...

If that doesn't help, show your doveconf -n output. # 2.0.5: /etc/dovecot/dovecot.conf doveconf: Warning: service auth { client_limit=4096 } is lower than required under max. load (4896) # OS: Linux 2.6.18-194.17.1.el5 x86_64 CentOS release 5.5 (Final) auth_cache_size = 4 k auth_failure_delay = 5 secs auth_worker_max_count = 800 base_dir = /var/run/dovecot/ first_valid_gid = 16777216 first_valid_uid = 16777216 info_log_path = /var/log/dovecot/info.log last_valid_gid = 33554431 last_valid_uid = 33554431 listen = * log_path = /var/log/dovecot/error.log mail_fsync = never mail_location = maildir:%h/Maildir passdb { args = cache_key=%u dovecot driver = pam } protocols = imap service auth { user = root vsz_limit = 1 k } service imap-login { process_limit = 800 process_min_avail = 50 service_count = 1 } service imap { process_limit = 4096 vsz_limit = 4 k } ssl_cert =

Also once started, show "ps aux|grep dovecot" output and "strace -tt -p pidof auth" output for a few seconds.

Strange, but I don't even have dovecot-auth process... :( When starting, Dovecot gives some warnings, but nothing fatal:

# /etc/init.d/dovecot restart Stopping Dovecot Imap: [ OK ] Starting Dovecot Imap: doveconf: Warning: service auth { client_limit=4096 } is lower than required under max. load (4896) Warning: service auth { client_limit=4096 } is lower than required under max. load (4896) [ OK ]

-- Veiko

On Fri, 2010-10-22 at 17:49 +0300, Veiko Kukk wrote:

Oct 22 17:45:24 config: Warning: service auth { client_limit=4096 } is lower than required under max. load (4896) Oct 22 17:45:24 master: Error: service(auth): child 15857 killed with signal 11 (core dumps disabled)

Well, this is the reason. It crashes. gdb backtrace would be helpful in solving this.

You should be able to get a core dump by:

1. Set:

service auth { user = root }

2. Run "ulimit -c unlimited" before starting Dovecot. If it still says "core dumps disabled" in the log file, it means that your init script disabled them again. Then you could e.g. just run "dovecot" directly without init script.

You can then get gdb backtrace with:

gdb /usr/local/libexec/dovecot/auth /var/run/dovecot/core bt full

If there are any problems, http://dovecot.org/bugreport.html may be helpful.