Re: [Dovecot] segfault in Debian Squeeze + Dovecot 2.1.10

Mon, 01 Oct 2012 13:14:35 -0700

Are performance issues a possible symptom of this problem? It was mentioned that this happens after disconnects, but does this break IDLE? 

Birta Levente <mailto:blevi.li...@gmail.com>
September 27, 2012 9:25 AM

Hi Timo

I just want to ask you: this issue is still in your task list?
If you need more debug information please tell me how can I give you.

    Thanks,
    Levi


Timo Sirainen <mailto:t...@iki.fi>
September 24, 2012 10:58 AM
Show your doveconf -n output at least. As for debugging information, that would depend on how you installed Dovecot? From some RPM or sources? 


Birta Levente <mailto:blevi.li...@gmail.com>
September 24, 2012 10:55 AM
I have the same problem, but on centos 6.3 64bit. How can I give you the debug information? 

    Levi


Timo Sirainen <mailto:t...@iki.fi>
September 24, 2012 10:32 AM
Well, the good news is that it crashes only after it has already disconnected the client anyway. But I thought I fixed this bug in v2.1.10 and I'm not able to reproduce it myself.. Having debugging information available might show something useful. Try installing dovecot-dbg package and getting the bt full again? 


Joe Auty <mailto:j...@netmusician.org>
September 23, 2012 7:05 AM


Timo Sirainen <mailto:t...@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:j...@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. 
------------------------------------------------------------------------





------------------------------------------------------------------------

Reply via email to