New subject: Problems investigating a crash in the siptrace module (4.3.1)

13 Aug 2015


      Hi,
we're experiencing crashes in the siptrace.so module with Kamailio
4.3.1. I looked at the core dump with gdb but it complained about
missing debugging symbols so all I could see was that it called
do_action() before branching into an unknown function in the siptrace
module.
I then installed the kamailio-dbg package to get the debugging symbols.
This had the weird effect that get the error "Cannot access memory at
..." in GDB and no longer see *any* function names (previously only the
names in the siptrace module were missing.
Any idea whats going on?
# gdb /usr/sbin/kamailio core
GNU gdb (GDB) 7.4.1-debian
Copyright (C) 2012 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/sbin/kamailio...Reading symbols from
/usr/lib/debug/.build-id/e7/8dc57031d294f320b360d8f2f875a005db757e.debug...done.
done.
[New LWP 31426]
Cannot access memory at address 0x3840f881f9c13908
Cannot access memory at address 0x3840f881f9c13900
(gdb) list
1771	main.c: No such file or directory.
(gdb) info threads
  Id   Target Id         Frame
* 1    LWP 31426         0x00007fbc89403f0f in ?? ()
(gdb) bt full
#0  0x00007fbc89403f0f in ?? ()
No symbol table info available.
#1  0x0800011000d46460 in ?? ()
No symbol table info available.
#2  0xffffffff00000001 in ?? ()
No symbol table info available.
#3  0x0000000000d63230 in ?? ()
No symbol table info available.
#4  0x00000000d59d000a in ?? ()
No symbol table info available.
#5  0x0000000000000000 in ?? ()
No symbol table info available.
# dpkg -l kamailio*
Desired=Unknown/Install/Remove/Purge/Hold
|
Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                           Version              Architecture
     Description
+++-==============================-====================-====================-=================================================================
ii  kamailio                       4.3.1+wheezy         amd64
     very fast and configurable SIP proxy
un  kamailio-berkeley-modules      <none>
     (no description available)
un  kamailio-carrierroute-modules  <none>
     (no description available)
un  kamailio-cpl-modules           <none>
     (no description available)
ii  kamailio-dbg:amd64             4.3.1+wheezy         amd64
     very fast and configurable SIP proxy [debug symbols]
un  kamailio-ldap-modules          <none>
     (no description available)
un  kamailio-lua-modules           <none>
     (no description available)
un  kamailio-mysql-modules         <none>
     (no description available)
un  kamailio-perl-modules          <none>
     (no description available)
ii  kamailio-postgres-modules:amd6 4.3.1+wheezy         amd64
     PostgreSQL database connectivity module for Kamailio
un  kamailio-presence-modules      <none>
     (no description available)
un  kamailio-python-modules        <none>
     (no description available)
un  kamailio-radius-modules        <none>
     (no description available)
un  kamailio-snmpstats-modules     <none>
     (no description available)
un  kamailio-tls-modules           <none>
     (no description available)
un  kamailio-unixodbc-modules      <none>
     (no description available)
un  kamailio-xml-modules           <none>
     (no description available)
un  kamailio-xmpp-modules          <none>
     (no description available)
Regards,
-Sven