https://bugs.kde.org/show_bug.cgi?id=433036
--- Comment #2 from magib...@hotmail.com ---
I can still reproduce in Plasma 5.21.2, from the "Desktop Effects" view as in
the screen recording in the first message.
> #0 0x0000000000000000 in ?? ()
> #1 0x00007efd1c8ab683 in
> QWaylandClientExtensionPrivate::handleRegistryGlobal (data=0x55919ee2c9a0,
> registry=0x55919d55f660, id=43, interface=..., version=1) at
> /usr/src/debug/qtwayland-everywhere-src-5.15.2/src/client/global/qwaylandclientextension.cpp:67
> #2 0x00007efd1c893b32 in QtWaylandClient::QWaylandDisplay::registry_global
> (this=<optimized out>, id=43, interface=..., version=1) at
> /usr/src/debug/qtwayland-everywhere-src-5.15.2/src/client/qwaylanddisplay.cpp:396
> #3 0x00007efd1c8b4dee in QtWayland::wl_registry::handle_global
> (data=0x55919d563300, object=<optimized out>, name=43,
> interface=0x55919f0be8e0 "org_kde_kwin_slide_manager", version=1) at
> qwayland-wayland.cpp:94
> #4 0x00007efd1a386acd in ?? () from /usr/lib/libffi.so.7
> #5 0x00007efd1a38603a in ?? () from /usr/lib/libffi.so.7
> #6 0x00007efd1c819fe4 in wl_closure_invoke (closure=0x55919f0be800, flags=1,
> target=<optimized out>, opcode=0, data=<optimized out>) at
> ../wayland-1.19.0/src/connection.c:1018
> #7 0x00007efd1c816563 in dispatch_event
> (display=display@entry=0x55919d563830, queue=<optimized out>,
> queue=<optimized out>) at ../wayland-1.19.0/src/wayland-client.c:1452
> #8 0x00007efd1c817cac in dispatch_queue (queue=0x55919d563900,
> display=0x55919d563830) at ../wayland-1.19.0/src/wayland-client.c:1598
> #9 wl_display_dispatch_queue_pending (display=0x55919d563830,
> queue=0x55919d563900) at ../wayland-1.19.0/src/wayland-client.c:1840
> #10 0x00007efd1c817d0d in wl_display_dispatch_pending (display=<optimized
> out>) at ../wayland-1.19.0/src/wayland-client.c:1903
> #11 0x00007efd1c89344d in QtWaylandClient::QWaylandDisplay::flushRequests
> (this=0x55919d5632f0) at
> /usr/src/debug/qtwayland-everywhere-src-5.15.2/src/client/qwaylanddisplay.cpp:221
> #12 0x00007efd1ed10dc0 in doActivate<false> (sender=0x55919d589ca0,
> signal_index=3, argv=argv@entry=0x7ffd3ee085c0) at kernel/qobject.cpp:3898
> #13 0x00007efd1ed09f20 in QMetaObject::activate
> (sender=sender@entry=0x55919d589ca0, m=m@entry=0x7efd1ef717a0
> <QSocketNotifier::staticMetaObject>,
> local_signal_index=local_signal_index@entry=0,
> argv=argv@entry=0x7ffd3ee085c0) at kernel/qobject.cpp:3946
> #14 0x00007efd1ed142f0 in QSocketNotifier::activated
> (this=this@entry=0x55919d589ca0, _t1=..., _t2=<optimized out>, _t3=...) at
> .moc/moc_qsocketnotifier.cpp:178
> #15 0x00007efd1ed14afd in QSocketNotifier::event (this=0x55919d589ca0,
> e=0x7ffd3ee086d0) at kernel/qsocketnotifier.cpp:302
> #16 0x00007efd1f89c752 in QApplicationPrivate::notify_helper (this=<optimized
> out>, receiver=0x55919d589ca0, e=0x7ffd3ee086d0) at
> kernel/qapplication.cpp:3632
> #17 0x00007efd1ecd9a2a in QCoreApplication::notifyInternal2
> (receiver=0x55919d589ca0, event=0x7ffd3ee086d0) at
> kernel/qcoreapplication.cpp:1063
> #18 0x00007efd1ed332a6 in socketNotifierSourceDispatch
> (source=0x55919d5aae00) at kernel/qeventdispatcher_glib.cpp:107
> #19 0x00007efd1c9a5b84 in g_main_context_dispatch () from
> /usr/lib/libglib-2.0.so.0
> #20 0x00007efd1c9f9c21 in ?? () from /usr/lib/libglib-2.0.so.0
> #21 0x00007efd1c9a43b1 in g_main_context_iteration () from
> /usr/lib/libglib-2.0.so.0
> #22 0x00007efd1ed32691 in QEventDispatcherGlib::processEvents
> (this=0x55919d579640, flags=...) at kernel/qeventdispatcher_glib.cpp:423
> #23 0x00007efd1ecd83ac in QEventLoop::exec (this=this@entry=0x7ffd3ee08930,
> flags=..., flags@entry=...) at
> ../../include/QtCore/../../src/corelib/global/qflags.h:69
> #24 0x00007efd1ece0844 in QCoreApplication::exec () at
> ../../include/QtCore/../../src/corelib/global/qflags.h:121
> #25 0x00007efd1f1a184e in QGuiApplication::exec () at
> kernel/qguiapplication.cpp:1867
> #26 0x00007efd1f89c6c6 in QApplication::exec () at
> kernel/qapplication.cpp:2824
> #27 0x000055919bbec960 in main (argc=<optimized out>, argv=0x7ffd3ee08a60) at
> /usr/src/debug/systemsettings-5.21.2/app/main.cpp:222
> (gdb) frame 1
> #1 0x00007fd59ca70683 in
> QWaylandClientExtensionPrivate::handleRegistryGlobal (data=0x55c040570740,
> registry=0x55c03edff660, id=44, interface=..., version=1) at
> /usr/src/debug/qtwayland-everywhere-src-5.15.2/src/client/global/qwaylandclientextension.cpp:67
> 67 if (interface ==
> QLatin1String(extension->extensionInterface()->name) &&
> !extension->d_func()->active) {
> (gdb) print *extension
> $1 = {<QObject> = {_vptr.QObject = 0x55919d553f50, static staticMetaObject =
> {d = {superdata = {direct = 0x0}, stringdata = 0x7efd1eea5720
> <qt_meta_stringdata_QObject>, data = 0x7efd1eea5600 <qt_meta_data_QObject>,
> static_metacall = 0x7efd1ed0f4d0 <QObject::qt_static_metacall(QObject*,
> QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata =
> 0x0}}, d_ptr = {d = 0x55919f062d20}, static staticQtMetaObject = {d =
> {superdata = {direct = 0x0}, stringdata = 0x7efd1eea86c0
> <qt_meta_stringdata_Qt>, data = 0x7efd1eea5840 <qt_meta_data_Qt>,
> static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static
> staticMetaObject = {d = {superdata = {direct = 0x7efd1ef68740
> <QObject::staticMetaObject>}, stringdata = 0x7efd1c910880
> <qt_meta_stringdata_QWaylandClientExtension>, data = 0x7efd1c9107c0
> <qt_meta_data_QWaylandClientExtension>, static_metacall = 0x7efd1c8b8d20
> <QWaylandClientExtension::qt_static_metacall(QObject*, QMetaObject::Call,
> int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
The string stored in the 'interface' variable is "org_kde_kwin_slide_manager".
For some reason, I am unable to reproduce the crash when running
systemsettings5 under Valgrind.
Sometimes, the issue appears to be unreproducible. Exiting and entering the
Plasma Wayland session makes it reproducible again.
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