gdb) bt
#0  0xb6edbbac in memcpy () from /lib/i686/libc.so.6
#1  0xb714ad41 in QAbstractItemModel::sort ()
   from /usr/lib/qt4/lib/libQtCore.so.4
#2  0xb714aef4 in QString::arg () from /usr/lib/qt4/lib/libQtCore.so.4
#3  0x0840f7d2 in ?? ()
#4  0x0840ff75 in ?? ()
#5  0x0840e31f in ?? ()
#6  0x08406d86 in QAbstractItemModel::sort ()
#7  0x08424e3b in ?? ()
#8  0x08424f0b in ?? ()
#9  0x083df219 in QAbstractItemModel::sort ()
#10 0xb6e84d8c in __libc_start_main () from /lib/i686/libc.so.6
#11 0x0807f981 in QAbstractItemModel::sort ()