SegFault in libqxcb-glx-integration

A SegFault occurs in libqxcb-glx-integration called from libQt5XcbQpa.

I have tested with 3.0.7.1 and the current git head.

I see it in 2 places depending which version.

The head version crashes upon start up. The back-trace is:

[#0](https://code.videolan.org/videolan/vlc/-/issues/0)   ?? () from /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
[#1](https://code.videolan.org/videolan/vlc/-/issues/1)   ?? () from /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
[#2](https://code.videolan.org/videolan/vlc/-/issues/2)   ?? () from /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
[#3](https://code.videolan.org/videolan/vlc/-/issues/3)   QXcbIntegration::createPlatformOpenGLContext(QOpenGLContext*) const () from /usr/lib/libQt5XcbQpa.so.5
[#4](https://code.videolan.org/videolan/vlc/-/issues/4)   QOpenGLContext::create() () from /usr/lib/libQt5Gui.so.5
[#5](https://code.videolan.org/videolan/vlc/-/issues/5)   ?? () from /usr/lib/libQt5QuickWidgets.so.5
[#6](https://code.videolan.org/videolan/vlc/-/issues/6)   QQuickWidget::resizeEvent(QResizeEvent*) () from /usr/lib/libQt5QuickWidgets.so.5
[#7](https://code.videolan.org/videolan/vlc/-/issues/7)   QWidget::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
[#8](https://code.videolan.org/videolan/vlc/-/issues/8)   QQuickWidget::event(QEvent*) () from /usr/lib/libQt5QuickWidgets.so.5
[#9](https://code.videolan.org/videolan/vlc/-/issues/9)   QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
[#10](https://code.videolan.org/videolan/vlc/-/issues/10)  QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
[#11](https://code.videolan.org/videolan/vlc/-/issues/11)  QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
[#12](https://code.videolan.org/videolan/vlc/-/issues/12)  QWidgetPrivate::sendPendingMoveAndResizeEvents(bool, bool) () from /usr/lib/libQt5Widgets.so.5
[#13](https://code.videolan.org/videolan/vlc/-/issues/13)  QWidgetPrivate::show_helper() () from /usr/lib/libQt5Widgets.so.5
[#14](https://code.videolan.org/videolan/vlc/-/issues/14)  QWidgetPrivate::setVisible(bool) () from /usr/lib/libQt5Widgets.so.5
[#15](https://code.videolan.org/videolan/vlc/-/issues/15)  QWidgetPrivate::showChildren(bool) () from /usr/lib/libQt5Widgets.so.5
[#16](https://code.videolan.org/videolan/vlc/-/issues/16)  QWidgetPrivate::show_helper() () from /usr/lib/libQt5Widgets.so.5
[#17](https://code.videolan.org/videolan/vlc/-/issues/17)  QWidgetPrivate::setVisible(bool) () from /usr/lib/libQt5Widgets.so.5
[#18](https://code.videolan.org/videolan/vlc/-/issues/18)  MainInterface::MainInterface () at gui/qt/main_interface.cpp:246
[#19](https://code.videolan.org/videolan/vlc/-/issues/19)  Thread () at gui/qt/qt.cpp:643
[#20](https://code.videolan.org/videolan/vlc/-/issues/20)  start_thread () from /usr/lib/libpthread.so.0
[#21](https://code.videolan.org/videolan/vlc/-/issues/21)  clone () from /usr/lib/libc.so.6

The Version 3.0.7.1 I have from Manjaro because when I compile it, the compile fails due to #22683 (closed). (since fixed) It crashes some time during playback. It begins playback and plays some -- usually not more than a few seconds-- and crashes. The crash happens with either audio or video. (each crashes VLC)

Here is a back trace:

[#0](https://code.videolan.org/videolan/vlc/-/issues/0)    () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
[#1](https://code.videolan.org/videolan/vlc/-/issues/1)    () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
[#2](https://code.videolan.org/videolan/vlc/-/issues/2)    () at /usr/lib/qt/plugins/xcbglintegrations/libqxcb-glx-integration.so
[#3](https://code.videolan.org/videolan/vlc/-/issues/3)   QXcbWindow::create() () at /usr/lib/libQt5XcbQpa.so.5
[#4](https://code.videolan.org/videolan/vlc/-/issues/4)   QXcbIntegration::createPlatformWindow(QWindow*) const () at /usr/lib/libQt5XcbQpa.so.5
[#5](https://code.videolan.org/videolan/vlc/-/issues/5)   QWindowPrivate::create(bool, unsigned long long) () at /usr/lib/libQt5Gui.so.5
[#6](https://code.videolan.org/videolan/vlc/-/issues/6)   QWidgetPrivate::create_sys(unsigned long long, bool, bool) () at /usr/lib/libQt5Widgets.so.5
[#7](https://code.videolan.org/videolan/vlc/-/issues/7)   QWidget::create(unsigned long long, bool, bool) () at /usr/lib/libQt5Widgets.so.5
[#8](https://code.videolan.org/videolan/vlc/-/issues/8)   QWidgetPrivate::setVisible(bool) () at /usr/lib/libQt5Widgets.so.5
[#9](https://code.videolan.org/videolan/vlc/-/issues/9)    () at /usr/lib/vlc/plugins/gui/libqt_plugin.so
[#10](https://code.videolan.org/videolan/vlc/-/issues/10)  QWidget::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
[#11](https://code.videolan.org/videolan/vlc/-/issues/11)  QSlider::event(QEvent*) () at /usr/lib/libQt5Widgets.so.5
[#12](https://code.videolan.org/videolan/vlc/-/issues/12)  QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
[#13](https://code.videolan.org/videolan/vlc/-/issues/13)  QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
[#14](https://code.videolan.org/videolan/vlc/-/issues/14)  QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
[#15](https://code.videolan.org/videolan/vlc/-/issues/15)   () at /usr/lib/libQt5Widgets.so.5
[#16](https://code.videolan.org/videolan/vlc/-/issues/16)  QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) () at /usr/lib/libQt5Widgets.so.5
[#17](https://code.videolan.org/videolan/vlc/-/issues/17)   () at /usr/lib/libQt5Widgets.so.5
[#18](https://code.videolan.org/videolan/vlc/-/issues/18)   () at /usr/lib/libQt5Widgets.so.5
[#19](https://code.videolan.org/videolan/vlc/-/issues/19)  QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
[#20](https://code.videolan.org/videolan/vlc/-/issues/20)  QApplication::notify(QObject*, QEvent*) () at /usr/lib/libQt5Widgets.so.5
[#21](https://code.videolan.org/videolan/vlc/-/issues/21)  QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /usr/lib/libQt5Core.so.5
[#22](https://code.videolan.org/videolan/vlc/-/issues/22)  QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /usr/lib/libQt5Gui.so.5
[#23](https://code.videolan.org/videolan/vlc/-/issues/23)  QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () at /usr/lib/libQt5Gui.so.5
[#24](https://code.videolan.org/videolan/vlc/-/issues/24)  QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Gui.so.5
[#25](https://code.videolan.org/videolan/vlc/-/issues/25)   () at /usr/lib/libQt5XcbQpa.so.5
[#26](https://code.videolan.org/videolan/vlc/-/issues/26)  g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
[#27](https://code.videolan.org/videolan/vlc/-/issues/27)   () at /usr/lib/libglib-2.0.so.0
[#28](https://code.videolan.org/videolan/vlc/-/issues/28)  g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
[#29](https://code.videolan.org/videolan/vlc/-/issues/29)  QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
[#30](https://code.videolan.org/videolan/vlc/-/issues/30)  QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
[#31](https://code.videolan.org/videolan/vlc/-/issues/31)  QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
[#32](https://code.videolan.org/videolan/vlc/-/issues/32)   () at /usr/lib/vlc/plugins/gui/libqt_plugin.so
[#33](https://code.videolan.org/videolan/vlc/-/issues/33)   () at /usr/lib/vlc/plugins/gui/libqt_plugin.so
[#34](https://code.videolan.org/videolan/vlc/-/issues/34)  start_thread () at /usr/lib/libpthread.so.0
[#35](https://code.videolan.org/videolan/vlc/-/issues/35)  clone () at /usr/lib/libc.so.6

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Flertoga @Flertoga · 5 years ago

Author

Playback can be done with either version by using another interface with --intf . Specifying vlc --intf qt causes the crash. The Qt version I have is 5.13.0 , which is the current release.
Rémi Denis-Courmont @Courmisch · 5 years ago

Maintainer

This looks like a bug in QPA or underneath it. It is very unlikely that VLC devs can do anything here.
Rémi Denis-Courmont added Status::not VLC label 5 years ago

added Status::not VLC label
Rémi Denis-Courmont closed 5 years ago

closed
Rémi Denis-Courmont added Component::Interface: Qt label 5 years ago

added Component::Interface: Qt label
Rémi Denis-Courmont added Platform::GNU/Linux label 5 years ago

added Platform::GNU/Linux label

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