backtrace

#0  futex_wait_cancelable (private=0, expected=0, futex_word=0xb08430) at ../sysdeps/nptl/futex-internal.h:186
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0xb083e0, cond=0xb08408) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0xb08408, mutex=0xb083e0) at pthread_cond_wait.c:638
#3  0x00007ffff613bafb in QWaitCondition::wait(QMutex*, QDeadlineTimer) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007ffff7b697ea in QSGThreadedRenderLoop::polishAndSync(QSGThreadedRenderLoop::Window*, bool) (this=0x6f3390, w=0x72a330, inExpose=<optimized out>)
    at /usr/include/x86_64-linux-gnu/qt5/QtCore/qdeadlinetimer.h:68
#5  0x00007ffff7bd1407 in QQuickWindow::event(QEvent*) (this=0x5cdaf0, e=0x7fffffffd3d0) at items/qquickwindow.cpp:1858
#6  0x00007ffff6dd815f in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#7  0x00007ffff6316f6a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007ffff66df814 in QPlatformWindow::windowEvent(QEvent*) () at /lib/x86_64-linux-gnu/libQt5Gui.so.5
#9  0x00007ffff6ddec16 in QApplication::notify(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Widgets.so.5
#10 0x00007ffff6316f6a in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007ffff636d883 in QTimerInfoList::activateTimers() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007ffff636e104 in  () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007ffff4abfe6b in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007ffff4ac0118 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007ffff4ac01cf in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#16 0x00007ffff636e4bf in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007ffff631592b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007ffff631dba0 in QCoreApplication::exec() () at /lib/x86_64-linux-gnu/libQt5Core.so.5
#19 0x000000000041288f in main ()