[Dovecot] segfault in Debian Squeeze + Dovecot 2.1.10

[Joe Auty]

>
> Timo Sirainen <mailto:tss at iki.fi>
> September 23, 2012 5:58 AM
>
>
> You should have a similar log line about the crash in mail.log (or 
> wherever "doveadm log find" says that errors get logged). Find those 
> lines, then configure login processes to dump core files. This 
> probably should work:
>
> service imap-login {
> executable = imap-login -D
> }
>
> Next time it crashes hopefully you'll have 
> /var/run/dovecot/login/core* file(s). Get a gdb backtrace from it send it:
>
> gdb /usr/lib/dovecot/imap-login /var/run/dovecot/login/core
> bt full

I hope I'm doing this correctly!

# gdb /usr/lib/dovecot/imap-login /var/run/dovecot/login/core
GNU gdb (GDB) 7.0.1-debian
Copyright (C) 2009 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later 
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/lib/dovecot/imap-login...(no debugging symbols 
found)...done.

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /usr/lib/dovecot/libdovecot-login.so.0...(no 
debugging symbols found)...done.
Loaded symbols for /usr/lib/dovecot/libdovecot-login.so.0
Reading symbols from /usr/lib/dovecot/libdovecot.so.0...(no debugging 
symbols found)...done.
Loaded symbols for /usr/lib/dovecot/libdovecot.so.0
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /usr/lib/libssl.so.0.9.8...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libssl.so.0.9.8
Reading symbols from /usr/lib/libcrypto.so.0.9.8...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libcrypto.so.0.9.8
Reading symbols from /lib/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols 
found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib/libz.so.1...(no debugging symbols 
found)...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /lib/libpthread.so.0...(no debugging symbols 
found)...done.
Loaded symbols for /lib/libpthread.so.0
Core was generated by `dovecot/imap-login   ?'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f789cd08e14 in hash_table_destroy () from 
/usr/lib/dovecot/libdovecot.so.0
(gdb) bt full
#0  0x00007f789cd08e14 in hash_table_destroy () from 
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#1  0x00007f789ccda054 in settings_parser_deinit () from 
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#2  0x00007f789ccff33d in master_service_settings_cache_deinit () from 
/usr/lib/dovecot/libdovecot.so.0
No symbol table info available.
#3  0x00007f789cf5e018 in login_binary_run () from 
/usr/lib/dovecot/libdovecot-login.so.0
No symbol table info available.
#4  0x00007f789c979c8d in __libc_start_main () from /lib/libc.so.6
No symbol table info available.
#5  0x0000000000402459 in ?? ()
No symbol table info available.
#6  0x00007fff8a9c65f8 in ?? ()
No symbol table info available.
#7  0x000000000000001c in ?? ()
No symbol table info available.
#8  0x0000000000000002 in ?? ()
No symbol table info available.
#9  0x00007fff8a9c7e6a in ?? ()
No symbol table info available.
#10 0x00007fff8a9c7e7d in ?? ()
No symbol table info available.
#11 0x0000000000000000 in ?? ()
No symbol table info available.


>
>
> Joe Auty <mailto:joe at netmusician.org>
> September 22, 2012 3:57 PM
> Hello,
>
> I'm seeing a lot of these in my /var/log/messages in Debian Squeeze, I 
> suspect this might be causing performance issues. Any suggestions what 
> I can try to fix this?
>
>
> I'm using the 2.1.10 packages obtained with the following in my 
> sources.list:
>
> deb http://xi.rename-it.nl/debian/ stable-auto/dovecot-2.1 main
>
>
> I need to use Dovecot 2.1.x because I need to support handling 
> multiple SSL certs.
> ------------------------------------------------------------------------