[Dovecot] Managesieve: Remote login fails

Stephan Bosch stephan at rename-it.nl
Sun Nov 9 18:26:32 EET 2008

Brainkiller schreef:
> Hello,
> I've been trying to get managesieve to work for our LAN, but when I try 
> to login from a remote host i always get the following line in the log 
> file:
> dovecot: child 26014 (login) killed with signal 11
> When i enable debuging, it just gives me that line, nothing more. I can 
> only login from the localhost through telnet but not from a remote host.
This is a segmentation fault (crash) and therefore definitely a bug in 
the ManageSieve service. But without more information I cannot fix find 
and fix this bug. You should try to obtain a core dump or a gdb trace as 
explained at http://dovecot.org/bugreport.html . Debugging the login 
daemons can be a little more tricky. I usually attach gdb to the 
managesieve-login process that is handling my connection (using the gdb 
attach command). Be sure to compile dovecot with debugging symbols 
enabled (default Debian packages are stripped).

It is also interesting to know when exactly during the login process it 
crashes. If you login manually from a remote host (as explained in 
section 6 of http://wiki.dovecot.org/ManageSieve) you will be able to 
check where it crashes. If you do not use TLS, you can also sniff the 
traffic between client and server using ngrep to see where the login 
process dies.


Stephan Bosch
stephan at rename-it.nl

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