On September 13, 2016 at 10:55 AM zerocool@modemsoft.it wrote:

Good morning, It is the first time I write in this mailing list and I apologize in
advance for possible nonsense that i can write. I have a mail server with qmail + courier imap and I would "Migrate"
to dovecot. I installed the package and configured the components necessary to me
using as system autentication checkpassword. I have verified the checkpassword operation without the processor
usage of Dovecot and is functioning. When you perform the tests with dovecot from the logs out these errors:

auth: Error: checkpassword(plutos,127.0.0.1,): Child
15375 died with signal 11 auth: Error: checkpassword(plutos,127.0.0.1,): Child
15376 died with signal 11 imap-login: Info: Disconnected (auth failed, 2 attempts in 8 secs):
user=<plutos>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured master: Warning: Killed with signal 15 (by pid=15479 uid=0 code=kill)

or :

auth: Error: checkpassword(plutos,192.168.1.113,<zzV561I8IuDAqAFx>):
Child 15851 died with signal 11 auth: Error: checkpassword(plutos,192.168.1.113,<zzV561I8IuDAqAFx>):
Child 15852 died with signal 11 imap-login: Info: Disconnected (auth failed, 2 attempts in 8 secs):
user=<plutos>, method=PLAIN, rip=192.168.1.113, lip=192.168.1.113,
secured imap-login: Info: Disconnected: Too many invalid commands (no auth
attempts in 102 secs): user=<>, rip=192.168.1.235, lip=192.168.1.113 auth: Error: checkpassword(plutos,192.168.1.235,<7pLd+FI81uXAqAHr>):
Child 15870 died with signal 11

It is already a long time that we slam but I can not figure out where
to make the mistake. Who will help me to solve this problem.

Thanks in advance for your support.

Regards

Hi!

Can you provide backtrace from the crash?

See http://www.dovecot.org/bugreport.html

Aki