(gdb) bt full
#0  0x00007fff933ec322 in select$DARWIN_EXTSN ()
No symbol table info available.
#1  0x0000000103d3acce in qt_safe_select ()
No symbol table info available.
#2  0x0000000103d3f0a3 in QEventDispatcherUNIXPrivate::doSelect ()
No symbol table info available.
#3  0x0000000103d3f572 in QEventDispatcherUNIX::processEvents ()
No symbol table info available.
#4  0x0000000103d09094 in QEventLoop::processEvents ()
No symbol table info available.
#5  0x0000000103d09444 in QEventLoop::exec ()
No symbol table info available.
#6  0x0000000103d0bb2c in QCoreApplication::exec ()
No symbol table info available.
#7  0x0000000100133e02 in run_backend ()
No symbol table info available.
#8  0x000000010004570e in main ()
No symbol table info available.
#9  0x000000010000aa84 in start ()
No symbol table info available.
kill
quit