Details
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Bug
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Resolution: Unresolved
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P4: Low
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None
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5.12.2
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None
Description
wayland 1.15, Qt-5.12.2, arm-linux (imx61)
When using multiple compositors, this warnings show up:
virtual void QEventDispatcherUNIX::registerSocketNotifier(QSocketNotifier*): Multiple socket notifiers for same socket 9 and type Read virtual void QEventDispatcherUNIX::unregisterSocketNotifier(QSocketNotifier*): Multiple socket notifiers for same socket 9 and type Read
And eventually the app crashes when deleting one compositor.
The reason is that in QWaylandCompositorPrivate::init(), wl_event_loop_get_fd(loop); return the same event loop fd for both compositors, 2 socket notifiers are instanciated, and the events are processed twice, yielding crashes in libwayland, when one compositor cleans up or (to be confirmed) when a client disconnect from a compositor.
1 wl_list_remove wayland-util.c 56 0xabba367c 2 wl_priv_signal_emit wayland-server.c 2021 0xabb9fcd4 3 wl_display_destroy wayland-server.c 1092 0xabba02d4 4 QWaylandCompositorPrivate::~QWaylandCompositorPrivate qwaylandcompositor.cpp 246 0x8a80d9b0 5 QWaylandQuickCompositorPrivate::~QWaylandQuickCompositorPrivate qwaylandquickcompositor.cpp 60 0x8a820e00 6 QWaylandQuickCompositorPrivate::~QWaylandQuickCompositorPrivate qwaylandquickcompositor.cpp 60 0x8a820e00 7 QScopedPointerDeleter<QObjectData>::cleanup qscopedpointer.h 60 0xad936c04 8 QScopedPointer<QObjectData, QScopedPointerDeleter<QObjectData>>::~QScopedPointer qscopedpointer.h 107 0xad936c04 9 QObject::~QObject qobject.cpp 891 0xad936c04 10 QWaylandObject::~QWaylandObject qwaylandcompositorextension.cpp 147 0x8a80349c 11 QWaylandCompositor::~QWaylandCompositor qwaylandcompositor.cpp 505 0x8a80c7cc 12 QWaylandQuickCompositor::~QWaylandQuickCompositor qwaylandquickcompositor.h 52 0x8c8cc1d0 13 QWaylandQuickCompositorQuickExtensionContainer::~QWaylandQuickCompositorQuickExtensionContainer qwaylandquickcompositorplugin.cpp 76 0x8c8cc1d0 14 QQmlPrivate::QQmlElement<QWaylandQuickCompositorQuickExtensionContainer>::~QQmlElement qqmlprivate.h 103 0x8c8cc1d0 15 QQmlPrivate::QQmlElement<QWaylandQuickCompositorQuickExtensionContainer>::~QQmlElement qqmlprivate.h 103 0x8c8cc1d0 16 qDeleteAll<QList<QObject *>::const_iterator> qalgorithms.h 320 0xafa6990c 17 qDeleteAll<QList<QObject *>> qalgorithms.h 328 0xafa6990c 18 QQmlApplicationEnginePrivate::cleanUp qqmlapplicationengine.cpp 64 0xafa6990c 19 QQmlApplicationEngine::~QQmlApplicationEngine qqmlapplicationengine.cpp 247 0xafa69990 20 QQmlApplicationEngine::~QQmlApplicationEngine qqmlapplicationengine.cpp 248 0xafa699b4 ... <More>
As can be seen in the 2 attached snapshot, the 2 QWaylandCompositorPrivate use the same display (0x431cce0), and so the same event loop.
