Details
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Bug
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Resolution: Unresolved
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Not Evaluated
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None
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5.15.17
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None
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Linux/Wayland
Description
I have been encountering a crash with Qt 5.15.17 on Arch Linux that is occuring when a MultiPointTouchArea gets removed from the object tree (e.g. by setting parent to null) inside its own onPressed event handler that is triggered by a touch event. The resulting crash dump is as follows:
1 ?? 0x7ffff7cd1fb4
2 ?? 0x7ffff7cd3363
3 QQuickItem::event(QEvent *) 0x7ffff7c405f0
4 QCoreApplication::notifyInternal2(QObject *, QEvent *) 0x7ffff688cf98
5 QQuickWindowPrivate::deliverMatchingPointsToItem(QQuickItem *, QQuickPointerEvent *, bool) 0x7ffff7c55bf2
6 QQuickWindowPrivate::deliverUpdatedTouchPoints(QQuickPointerTouchEvent *) 0x7ffff7c56371
7 QQuickWindowPrivate::deliverTouchEvent(QQuickPointerTouchEvent *) 0x7ffff7c57a6e
8 QQuickWindowPrivate::deliverPointerEvent(QQuickPointerEvent *) 0x7ffff7c4f77b
9 QQuickWindowPrivate::deliverDelayedTouchEvent() 0x7ffff7c51864
10 QQuickWindowPrivate::flushFrameSynchronousEvents() 0x7ffff7c521b1
11 ?? 0x7ffff7c021a3
12 QQuickWindow::event(QEvent *) 0x7ffff7c52519
13 QCoreApplication::notifyInternal2(QObject *, QEvent *) 0x7ffff688cf98
14 QPlatformWindow::deliverUpdateRequest() 0x7ffff6d334d0
15 QObject::event(QEvent *) 0x7ffff68b0be0
16 QCoreApplication::notifyInternal2(QObject *, QEvent *) 0x7ffff688cf98
17 QCoreApplicationPrivate::sendPostedEvents(QObject *, int, QThreadData *) 0x7ffff688daa3
18 ?? 0x7ffff68d3e68
19 g_main_context_dispatch 0x7ffff551687b
20 ?? 0x7ffff556d299
21 g_main_context_iteration 0x7ffff5515132
22 QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) 0x7ffff68d7c4c
23 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) 0x7ffff688573c
24 QCoreApplication::exec() 0x7ffff6890269
25 main main.cpp 21 0x5555555565a1
This is the basic QML example used to reproduce the issue.
import QtQuick 2.4 import QtQuick.Controls 2.4 ApplicationWindow { visible: true width: 600 height: 500 title: "ExampleApp" Rectangle { anchors.fill: parent MultiPointTouchArea { anchors.fill: parent onPressed: { parent = null } } } }