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+If Spectrum is crashing, it’s useful to get backtrace to help us to find the reason. To get a backtrace you have to have debugging symbols installed or compiled Spectrum with them.
+
+h2. Installing debugging symbols
+
+a) If you are installing from our Debian/Ubuntu repository, you can just install debugging symbols with this command:
+
+<pre>
+sudo apt-get install spectrum2-dbg libtransport-dbg
+</pre>
+
+*Note:* The debug package has to be in the exact same version as the main package. So your spectrum installation might be upgraded as well when you install these packages.
+
+b) If you build Spectrum by yourself, you have to build it in Debug mode.
+
+<pre>
+cmake . -DCMAKE_BUILD_TYPE=Debug
+make
+sudo make install
+</pre>
+
+h2. Installing GDB
+
+<pre>
+sudo apt-get install gdb
+</pre>
+
+h2. Getting a backtrace from a coredump
+
+This is preferred method how to get the backtrace, because Spectrum runs without performance issues and once it crashes, it generates a coredump. 
+
+Reproduce the crash and Spectrum will generate the coredump (file named like “core.12345” where the number is Spectrum process ID) in the working_dir (that directory is configurable in config file, default value is /var/lib/spectrum2/$jid/). Now you just have to get the backtrace from the coredump:
+
+<pre>
+cd /var/lib/spectrum/$jid/userdir
+gdb spectrum2 core.12345
+bt full
+</pre>
+
+h2. Getting a backtrace by running Spectrum in GDB
+
+This is harder method how to get backtrace and also running Spectrum in GDB brings performance issues. Run Spectrum in GDB:
+
+<pre>
+gdb --args spectrum2 -n config_name
+</pre>
+
+where “config_name” is name of config you have in /etc/spectrum (You can also specify full path to config instead of its name).
+
+You will see something like this:
+
+<pre>
+GNU gdb (GDB) 7.0-ubuntu
+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 "i486-linux-gnu".
+For bug reporting instructions, please see:
+<http://www.gnu.org/software/gdb/bugs/>...
+Reading symbols from /home/hanzz/code/test/transport/spectrum...done.
+(gdb)
+</pre>
+Now you have to start Spectrum with following GDB command:
+
+<pre>
+run
+</pre>
+
+Since now Spectrum is running and you have to reproduce the crash or just wait for crash. Then get a backtrace with this GDB command:
+
+<pre>
+bt full
+</pre>
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