$ gdb ./qtLoggerSample
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 /home/ilya/projects/qtLogger/build/qtLoggerSample...done.
(gdb) r
Starting program: /home/ilya/projects/qtLogger/build/qtLoggerSample
[Thread debugging using libthread_db enabled]
startup
_DEBUG
QtLogger::QtLogger()

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7bdcd43 in QListData::isEmpty (this=0x603420) at /usr/include/qt4/QtCore/qlist.h:91
91          inline bool isEmpty() const { return d->end  == d->begin; }
(gdb) bt
#0  0x00007ffff7bdcd43 in QListData::isEmpty (this=0x603420) at /usr/include/qt4/QtCore/qlist.h:91
#1  0x00007ffff7bdcdde in QList<QString*>::isEmpty (this=0x603420) at /usr/include/qt4/QtCore/qlist.h:134
#2  0x00007ffff7bdc502 in QtLogger (this=0x603240) at /home/ilya/projects/qtLogger/lib-qtLogger/src/libqtlogger.cpp:55
#3  0x0000000000401231 in main (argc=1, argv=0x7fffffffe3c8) at /home/ilya/projects/qtLogger/src/main.cpp:22