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 ()