Hi,
I am working on a rather large application using QQuickWidget and Coin3d to
mention the most "dangerous" components, therefore it is not feasible to
produce a minimal version to show my problem anytime soon. The operating system
is Windows 10 64 bit using compiler msvc2017_64.
Until now, the project was compiled using Qt-5.9.3, but now Qt-5.12.0 should be
used. After a number of fixes to compensate for behavioral changes, the release
build worked fine, but the debug build crashes as shown in the next line:
ASSERT: "m_context->openglContext() == QOpenGLContext::currentContext()" in
file scenegraph\coreapi\qsgbatchrenderer.cpp, line 2591
This happens in the event loop during a regular rendering call of the
QQuickWidget, as can be seen in the stack trace (I hope the formatting will be
preserved):
1 qt_message_fatal qlogging.cpp
1872 0x7ffdb5feb16b
2 QMessageLogger::fatal qlogging.cpp
887 0x7ffdb5fe9942
3 qt_assert qglobal.cpp
3199 0x7ffdb5fda65b
4 QSGBatchRenderer::Renderer::render qsgbatchrenderer.cpp
2593 0x7ffdb87345a7
5 QSGRenderer::renderScene qsgrenderer.cpp
245 0x7ffdb872d7c5
6 QSGRenderer::renderScene qsgrenderer.cpp
191 0x7ffdb872d9d1
7 QSGDefaultRenderContext::renderNextFrame qsgdefaultrendercontext.cpp
184 0x7ffdb87b0691
8 QQuickWindowPrivate::renderSceneGraph qquickwindow.cpp
488 0x7ffdb88717ec
9 QQuickRenderControl::render qquickrendercontrol.cpp
344 0x7ffdb89ea698
10 QQuickWidgetPrivate::render qquickwidget.cpp
290 0x7ffe02ce8a8c
11 QQuickWidgetPrivate::renderSceneGraph qquickwidget.cpp
342 0x7ffe02ce8da1
12 QQuickWidget::timerEvent qquickwidget.cpp
1130 0x7ffe02ce6011
13 QObject::event qobject.cpp
1231 0x7ffdb6425b93
14 QWidget::event qwidget.cpp
9334 0x7ffdb915cc83
15 QQuickWidget::event qquickwidget.cpp
1526 0x7ffe02ce7231
16 QApplicationPrivate::notify_helper qapplication.cpp
3752 0x7ffdb90fbf3e
17 QApplication::notify qapplication.cpp
3703 0x7ffdb90f9694
18 QCoreApplication::notifyInternal2 qcoreapplication.cpp
1061 0x7ffdb63ccc56
19 QCoreApplication::sendEvent qcoreapplication.cpp
1452 0x7ffdb63ca992
20 QEventDispatcherWin32Private::sendTimerEvent qeventdispatcher_win.cpp
455 0x7ffdb64904bd
... <More>
I removed all the active Coin3d code and introduced stuff like
QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts); without any change,
so it should really be just in the Qt code. I tried all versions of Qt and
found out, that Qt versions since Qt-5.9.5 show this problem. Note, that only
Debug builds are affected, Release builds do not crash.
Does anyone have any idea, what could be causing this and how to get around it?
Thank you for any hints!
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