(gdb) bt full
#0  QQuickEventPoint::grabberPointerHandler (this=0x0) at /usr/src/debug/qtdeclarative/5.12.1+gitAUTOINC+a566125b9f-r0/git/src/quick/items/qquickevents.cpp:879
No locals.
#1  0x0000007fa55d194c in QQuickWindowPrivate::deliverPressOrReleaseEvent (this=0x5a9f60, this@entry=0x7fa55d393c <QQuickWindowPrivate::handleTouchEvent(QTouchEvent*)+236>, event=event@entry=0x1c07620,
    handlersOnly=handlersOnly@entry=false) at /usr/src/debug/qtdeclarative/5.12.1+gitAUTOINC+a566125b9f-r0/git/src/quick/items/qquickwindow.cpp:2531
        pointCount = 1
        targetItems = {d = 0x7fa4860ca8 <QArrayData::shared_null>}
        isTouchEvent = true
#2  0x0000007fa55d2498 in QQuickWindowPrivate::deliverTouchEvent (this=0x7fa55d393c <QQuickWindowPrivate::handleTouchEvent(QTouchEvent*)+236>, this@entry=0x5a9f60, event=0x1c07620)
    at /usr/src/debug/qtdeclarative/5.12.1+gitAUTOINC+a566125b9f-r0/git/src/quick/items/qquickwindow.cpp:2434
        allReleased = <optimized out>
        pointCount = <optimized out>
#3  0x0000007fa55d2fa4 in QQuickWindowPrivate::deliverPointerEvent (this=this@entry=0x5a9f60, event=0x1c07620) at /usr/src/debug/qtdeclarative/5.12.1+gitAUTOINC+a566125b9f-r0/git/src/quick/items/qquickwindow.cpp:2355
No locals.
#4  0x0000007fa55d393c in QQuickWindowPrivate::handleTouchEvent (this=this@entry=0x5a9f60, event=0x7fdb847fd0) at /usr/src/debug/qtdeclarative/5.12.1+gitAUTOINC+a566125b9f-r0/git/src/quick/items/qquickwindow.cpp:2134
        qquickwindow_no_touch_compression = false
#5  0x0000007fa55d4b30 in QQuickWindow::event (this=0x55ba30, e=0x7fdb847fd0) at /usr/src/debug/qtdeclarative/5.12.1+gitAUTOINC+a566125b9f-r0/git/src/quick/items/qquickwindow.cpp:1596
        touch = 0x7fdb847fd0
#6  0x0000007fa4741f5c in QCoreApplication::notifyInternal2 (receiver=0x55ba30, event=0x7fdb847fd0) at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/corelib/kernel/qcoreapplication.cpp:1060
        selfRequired = true
        result = false
        cbdata = {0x55ba30, 0x7fdb847fd0, 0x7fdb847e77}
        d = <optimized out>
        threadData = 0x49d550
        scopeLevelCounter = {threadData = 0x49d550}
#7  0x0000007fa4742174 in QCoreApplication::sendSpontaneousEvent (receiver=receiver@entry=0x55ba30, event=event@entry=0x7f8c000c60)
    at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/corelib/kernel/qcoreapplication.cpp:1462
No locals.
#8  0x0000007fa4f9cb70 in QGuiApplicationPrivate::processTouchEvent (e=e@entry=0x7f8c001ca0) at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/gui/kernel/qguiapplication.cpp:2865
        w = 0x55ba30
        eventType = 30037584
        touchEvent = {<QInputEvent> = {<QEvent> = {_vptr.QEvent = 0x7fa53914b8 <vtable for QTouchEvent+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7fa4927240 <qt_meta_stringdata_QEvent>,
                  data = 0x7fa4926c90 <qt_meta_data_QEvent>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}, d = 0x0, t = 194, posted = 0, spont = 1, m_accept = 1, reserved = 7024}, modState = {i = 0}, ts = 39017},
          _window = 0x55ba30, _target = 0x0, _device = 0x7f8c000c60, _touchPointStates = {i = 1}, _touchPoints = {<QListSpecialMethods<QTouchEvent::TouchPoint>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {
                      _q_value = {<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0x1ca5650}, d = 0x1ca5650}}}
        d = <optimized out>
        window = 0x7fa53914b8 <vtable for QTouchEvent+16>
        windowsNeedingEvents = {{d = 0x10355d0, e = 0x10355d0}}
        stationaryTouchPointChangedVelocity = <optimized out>
        it = {i = 0x170b910}
#9  0x0000007fa4f9ede8 in QGuiApplicationPrivate::processWindowSystemEvent (e=0x7f8c001ca0) at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/gui/kernel/qguiapplication.cpp:1846
No locals.
#10 0x0000007fa4f7b850 in QWindowSystemEventHandler::sendEvent (this=<optimized out>, e=<optimized out>) at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/gui/kernel/qwindowsysteminterface.cpp:192
No locals.
#11 0x0000007fa2c26400 in QtWayland::WindowSystemEventHandler::sendEvent (this=<optimized out>, e=<optimized out>) at /usr/src/debug/qtwayland/5.12.1+gitAUTOINC+d296dea131-r0/git/src/compositor/compositor_api/qwaylandcompositor.cpp:115
No locals.
#12 0x0000007fa4f7cb68 in QWindowSystemInterface::sendWindowSystemEvents (flags=..., flags@entry=...) at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/gui/kernel/qwindowsysteminterface.cpp:1067
        event = 0x7f8c001ca0
        nevents = 0
#13 0x0000007f9f687310 in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/platformsupport/eventdispatchers/qunixeventdispatcher.cpp:64
        didSendEvents = true
#14 0x0000007fa4740714 in QEventLoop::exec (this=this@entry=0x7fdb848280, flags=..., flags@entry=...) at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/corelib/kernel/qeventloop.cpp:225
        d = 0x5d7480
        locker = {val = 4839008}
        ref = {d = 0x5d7480, locker = @0x7fdb848268, exceptionCaught = true}
#15 0x0000007fa4748fc8 in QCoreApplication::exec () at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/corelib/kernel/qcoreapplication.cpp:1363
        threadData = 0x49d550
        eventLoop = {<QObject> = {_vptr.QObject = 0x7fa4a56490 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7fa492a4b0 <qt_meta_stringdata_QObject>,
                data = 0x7fa492a5f0 <qt_meta_data_QObject>, static_metacall = 0x7fa4776e98 <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x5d7480},
            static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7fa492d4f8 <qt_meta_stringdata_Qt>, data = 0x7fa492a710 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}},
          static staticMetaObject = {d = {superdata = 0x454ca0 <QObject::staticMetaObject>, stringdata = 0x7fa4926190 <qt_meta_stringdata_QEventLoop>, data = 0x7fa49261f0 <qt_meta_data_QEventLoop>,
              static_metacall = 0x7fa47403e8 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        returnCode = <optimized out>
---Type <return> to continue, or q <return> to quit---r
#16 0x0000007fa4f95340 in QGuiApplication::exec () at /usr/src/debug/qtbase/5.12.1+gitAUTOINC+0c49815333-r0/git/src/gui/kernel/qguiapplication.cpp:1779