(gdb) backtrace
#0  0x00007fffef01987d in poll () from /usr/lib/libc.so.6
#1  0x00007fffe9f25584 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00007fffe9f2568c in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0x00007ffff02cc16c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#4  0x00007ffff027e34b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#5  0x00007ffff0284921 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#6  0x000000000043aa39 in main ()