https://bugs.kde.org/show_bug.cgi?id=452482
--- Comment #4 from Aleix Pol <aleix...@kde.org> ---
After the MR I get much less frequent crashes, but I still get some. Here is a
backtrace. It may give an insight on why it's needed, note the output=0x0
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f34d0433a97 in KWin::Workspace::clientArea (this=0x561c9bb5d3a0,
opt=KWin::PlacementArea, output=0x0, desktop=0x561c9c020350) at
/home/apol/devel/frameworks/kwin/src/workspace.cpp:2287
2287 screenArea = effectiveOutput->geometry();
[Current thread is 1 (Thread 0x7f34c832ca80 (LWP 20733))]
(gdb) where
#0 0x00007f34d0433a97 in KWin::Workspace::clientArea(KWin::clientAreaOption,
KWin::AbstractOutput const*, KWin::VirtualDesktop const*) const (this=
0x561c9bb5d3a0, opt=KWin::PlacementArea, output=0x0,
desktop=0x561c9c020350) at
/home/apol/devel/frameworks/kwin/src/workspace.cpp:2287
#1 0x00007f34d04288e6 in KWin::Workspace::clientArea(KWin::clientAreaOption,
KWin::Toplevel const*, KWin::AbstractOutput const*) const (this=0x561c9bb5d3a0,
opt=KWin::PlacementArea, window=
0x561c9bc88770, output=0x0) at
/home/apol/devel/frameworks/kwin/src/workspace.cpp:2339
#2 0x00007f34d04337b1 in KWin::Workspace::clientArea(KWin::clientAreaOption,
KWin::Toplevel const*) const (this=0x561c9bb5d3a0, opt=KWin::PlacementArea,
window=0x561c9bc88770)
at /home/apol/devel/frameworks/kwin/src/workspace.cpp:2327
#3 0x00007f34d02fe05c in
KWin::Placement::placeTransient(KWin::AbstractClient*) (this=0x561c9c01e490,
c=0x561c9cb9b120) at /home/apol/devel/frameworks/kwin/src/placement.cpp:525
#4 0x00007f34d02fd8c8 in KWin::Placement::place(KWin::AbstractClient*, QRect
const&) (this=0x561c9c01e490, c=0x561c9cb9b120, area=...) at
/home/apol/devel/frameworks/kwin/src/placement.cpp:64
#5 0x00007f34d047c69c in KWin::XdgPopupClient::initialize()
(this=0x561c9cb9b120) at
/home/apol/devel/frameworks/kwin/src/xdgshellclient.cpp:2006
#6 0x00007f34d0486a78 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>,
QtPrivate::List<>, void, void (KWin::XdgPopupClient::*)()>::call(void
(KWin::XdgPopupClient::*)(), KWin::XdgPopupClient*, void**)
(f=(void (KWin::XdgPopupClient::*)(KWin::XdgPopupClient * const))
0x7f34d047c5e0 <KWin::XdgPopupClient::initialize()>, o=0x561c9cb9b120,
arg=0x7ffca9805470)
at /home/apol/devel/kde5/include/QtCore/qobjectdefs_impl.h:152
#7 0x00007f34d04869dd in QtPrivate::FunctionPointer<void
(KWin::XdgPopupClient::*)()>::call<QtPrivate::List<>, void>(void
(KWin::XdgPopupClient::*)(), KWin::XdgPopupClient*, void**)
(f=(void (KWin::XdgPopupClient::*)(KWin::XdgPopupClient * const))
0x7f34d047c5e0 <KWin::XdgPopupClient::initialize()>, o=0x561c9cb9b120,
arg=0x7ffca9805470)
at /home/apol/devel/kde5/include/QtCore/qobjectdefs_impl.h:185
#8 0x00007f34d0486922 in QtPrivate::QSlotObject<void
(KWin::XdgPopupClient::*)(), QtPrivate::List<>, void>::impl(int,
QtPrivate::QSlotObjectBase*, QObject*, void**, bool*)
(which=1, this_=0x561c9b9b6150, r=0x561c9cb9b120, a=0x7ffca9805470,
ret=0x0) at /home/apol/devel/kde5/include/QtCore/qobjectdefs_impl.h:418
#9 0x00007f34ce47aec3 in QtPrivate::QSlotObjectBase::call(QObject*, void**)
(a=0x7ffca9805470, r=0x561c9cb9b120, this=0x561c9b9b6150)
at
../../include/QtCore/../../../../../devel/frameworks/qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:398
#10 doActivate<false>(QObject*, int, void**) (sender=0x561c9cba6fd0,
signal_index=4, argv=0x7ffca9805470) at
/home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qobject.cpp:3886
#11 0x00007f34cf12f0ea in
KWaylandServer::SurfaceInterfacePrivate::applyState(KWaylandServer::SurfaceState*)
(this=0x561c9cb49880, next=<optimized out>)
at
/home/apol/devel/frameworks/kwayland-server/src/server/surface_interface.cpp:660
#12 0x00007f34cbb1b536 in () at /usr/lib/libffi.so.8
#13 0x00007f34cbb18037 in () at /usr/lib/libffi.so.8
#14 0x00007f34cf055af2 in () at /usr/lib/libwayland-server.so.0
#15 0x00007f34cf059e14 in () at /usr/lib/libwayland-server.so.0
#16 0x00007f34cf05884a in wl_event_loop_dispatch () at
/usr/lib/libwayland-server.so.0
#17 0x00007f34cf0fa984 in KWaylandServer::Display::dispatchEvents()
(this=<optimized out>) at
/home/apol/devel/frameworks/kwayland-server/src/server/display.cpp:114
#18 0x00007f34ce47aec3 in QtPrivate::QSlotObjectBase::call(QObject*, void**)
(a=0x7ffca9805e10, r=0x561c9b6cf840, this=0x561c9b6bbce0)
at
../../include/QtCore/../../../../../devel/frameworks/qt5/qtbase/src/corelib/kernel/qobjectdefs_impl.h:398
#19 doActivate<false>(QObject*, int, void**) (sender=0x561c9bdf3390,
signal_index=3, argv=0x7ffca9805e10) at
/home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qobject.cpp:3886
#20 0x00007f34ce47438f in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**)
(sender=sender@entry=0x561c9bdf3390, m=m@entry=0x7f34ce71c140
<QSocketNotifier::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffca9805e10)
at
/home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qobject.cpp:3946
#21 0x00007f34ce47e3af in QSocketNotifier::activated(QSocketDescriptor,
QSocketNotifier::Type, QSocketNotifier::QPrivateSignal)
(this=this@entry=0x561c9bdf3390, _t1=..., _t2=<optimized out>, _t3=...)
at .moc/moc_qsocketnotifier.cpp:178
#22 0x00007f34ce47ebab in QSocketNotifier::event(QEvent*) (this=0x561c9bdf3390,
e=0x7ffca9805f30) at
/home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qsocketnotifier.cpp:302
#23 0x00007f34cd0f66cf in QApplicationPrivate::notify_helper(QObject*, QEvent*)
(this=<optimized out>, receiver=0x561c9bdf3390, e=0x7ffca9805f30)
at
/home/apol/devel/frameworks/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3637
#24 0x00007f34ce44469a in QCoreApplication::notifyInternal2(QObject*, QEvent*)
(receiver=0x561c9bdf3390, event=0x7ffca9805f30)
at
/home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1064
#25 0x00007f34ce49913b in
QEventDispatcherUNIXPrivate::activateSocketNotifiers() (this=0x561c9b68f600) at
/home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:304
#26 0x00007f34ce49959b in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=<optimized out>, flags=...)
at
/home/apol/devel/frameworks/qt5/qtbase/src/corelib/kernel/qeventdispatcher_unix.cpp:511
#27 0x0000561c9aac046d in
QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=<optimized out>, flags=...)
at
/home/apol/devel/frameworks/qt5/qtbase/src/platformsupport/eventdispatchers/qunixeventdispatcher.cpp:63
#28 0x00007f34ce44309b in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7ffca98060c0, flags=..., flags@entry=...)
at
../../include/QtCore/../../../../../devel/frameworks/qt5/qtbase/src/corelib/global/qflags.h:69
#29 0x00007f34ce44b370 in QCoreApplication::exec() () at
../../include/QtCore/../../../../../devel/frameworks/qt5/qtbase/src/corelib/global/qflags.h:121
#30 0x0000561c9a97cf9d in main(int, char**) (argc=14, argv=0x7ffca9806b58) at
/home/apol/devel/frameworks/kwin/src/main_wayland.cpp:659
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