That backtrace isn't very useful. Please include debug symbols

Created attachment 144152 [details]
gdb crash report 1

Created attachment 144153 [details]
gdp backtrace 2 (newer)

Created attachment 144154 [details]
support information

The 2nd backtrace is newer, it had no @ chars in the top left corner and was cought directly after switching from tty3 to tty2

Maybe those are even 2 different bugs. The first (1) snapshot was made after the crash while working in IntelliJIdea (no walcom attached).
The second was made while drawing in with the walcom in Xournal++. I switched to tty3 to see gdb attachment status and then switched back to tty2 (it instantly crashed)

I don't want to rush you, but could you please fix this prioritized? My walcom tablet is completely unsuable on this device. Also without the tablet the crash is occuring pretty often, plasma is really unusable to me.


Thanks
Moritz

Please take a look at it asap, it crashes several times per day while working on this device. It is unusable!

The backtrace is still missing debug symbols, beyond that it has something to do with the tablet cursor being updated it doesn't say much.
Do you have a way to reproduce the crash, something more specific how you can trigger it?

Created attachment 144350 [details]
backtrace (with debug symbols)

Thanks for the reply:

Sorry, thought I had them installed on this device. The only one that I did not have installed are they from `libQt5Quick`. I installed them now, I'll provide an update once it crashes again. I also have to say, that this crash behaved different that the others: My cursur (and basically the whole screen) froze for some seconds and than plasma restarted (but maybe because gdb collected the backtrace and froze it?)


I am really not sure how to reproduce it. Sometimes it happens when drawing with the walcom. But at home I attached it and draw half an hour without any crash. The only thing that is different is the location and that I had it connected to the grid at home.

It mostly happens (and that is the even more annoying thing) when opening new windows. I mostly open the commit dialog in IntelliJIdea and then it crashes before showing it. I tried opening and closing windows (also the ones that crashed kwin), but it is really hard to crash it on purpose (at least if you don't know how, like me)

Sometimes it is crashing 5 times in half an hour (like as I submitted the last backtrace). I saw your answer and wanted to open my terminal to install the debug symbols and it crashed 2 times. And than I had gdb attached it for almost 1 day now and it did not crash (until now)

Thanks

Still crashing. Please

Sorry, your response got lost in my emails.
The new backtrace looks like a different crash, which has been fixed today: https://bugs.kde.org/show_bug.cgi?id=444381.

If you come upon a crash that has "KWaylandServer::TabletToolV2Interface" in its backtrace again, please attach that one here.

Created attachment 144595 [details]
backtrace

Here we go, just picked that one. And this is now (not a random crash) it is related to the tablet

Any updates?

I can reproduce the crash:

* put pen on the tablet so there's visible tablet cursor. while doing that switch to another tty and back
* if the pen is still on the tablet, kwin will crash

Note that it's important to have some open application.

* thread #1, name = 'kwin_wayland', stop reason = signal SIGSEGV: invalid address (fault address: 0x0)
  * frame #0: 0x00007f045d1d51cb libQt5Core.so.5`std::__atomic_base<int>::operator++(this=0x00720075006f0073) at atomic_base.h:378:34
    frame #1: 0x00007f045d1d4395 libQt5Core.so.5`bool QAtomicOps<int>::ref<int>(_q_value=0x00720075006f0073) at qatomic_cxx11.h:283:16
    frame #2: 0x00007f045d1d368e libQt5Core.so.5`QBasicAtomicInteger<int>::ref(this=0x00720075006f0073) at qbasicatomic.h:118:42
    frame #3: 0x00007f045d284c37 libQt5Core.so.5`QtSharedPointer::ExternalRefCountData::getAndRef(obj=0x0000562f702af550) at qsharedpointer.cpp:1398:26
    frame #4: 0x00007f0461058603 libkwin.so.5`QWeakPointer<QObject>::QWeakPointer<QObject, true>(this=0x00007fffd3505f28, ptr=0x0000562f702af550, (null)=true) at qsharedpointer_impl.h:679:49
    frame #5: 0x00007f046105858b libkwin.so.5`QWeakPointer<QObject>& QWeakPointer<QObject>::assign<QObject>(this=0x0000562f6f297f00, ptr=0x0000562f702af550) at qsharedpointer_impl.h:675:22
    frame #6: 0x00007f04610d1541 libkwin.so.5`QPointer<KWaylandServer::SurfaceInterface>::operator=(this=0x0000562f6f297f00, p=0x0000562f702af550) at qpointer.h:74:10
    frame #7: 0x00007f04610d13f2 libkwin.so.5`KWin::SurfaceCursor::updateCursorSurface(this=0x0000562f6f297ea0, surface=0x0000562f702af550, hotspot=0x00007fffd3506038) at input.cpp:1679:19
    frame #8: 0x00007f04610d1241 libkwin.so.5`KWin::TabletInputFilter::createTool(this=0x0000562f6f4ff9c0, tcursor=0x0000562f6ed30870)::'lambda'(KWaylandServer::TabletCursorV2*)::operator()(KWaylandServer::TabletCursorV2*) const at input.cpp:1855:21
    frame #9: 0x00007f04610d10c1 libkwin.so.5`QtPrivate::FunctorCall<QtPrivate::IndexesList<0>, QtPrivate::List<KWaylandServer::TabletCursorV2*>, void, KWin::TabletInputFilter::createTool(KWin::TabletToolId const&)::'lambda'(KWaylandServer::TabletCursorV2*)>::call(f=0x0000562f6f4ff9c0, arg=0x00007fffd35062b0)::'lambda'(KWaylandServer::TabletCursorV2*)&, void**) at qobjectdefs_impl.h:146:13
    frame #10: 0x00007f04610d1081 libkwin.so.5`void QtPrivate::Functor<KWin::TabletInputFilter::createTool(KWin::TabletToolId const&)::'lambda'(KWaylandServer::TabletCursorV2*), 1>::call<QtPrivate::List<KWaylandServer::TabletCursorV2*>, void>(f=0x0000562f6f4ff9c0, (null)=0x0000562f6f297ea0, arg=0x00007fffd35062b0)::'lambda'(KWaylandServer::TabletCursorV2*)&, void*, void**) at qobjectdefs_impl.h:256:13
    frame #11: 0x00007f04610d1021 libkwin.so.5`QtPrivate::QFunctorSlotObject<KWin::TabletInputFilter::createTool(KWin::TabletToolId const&)::'lambda'(KWaylandServer::TabletCursorV2*), 1, QtPrivate::List<KWaylandServer::TabletCursorV2*>, void>::impl(which=1, this_=0x0000562f6f4ff9b0, r=0x0000562f6f297ea0, a=0x00007fffd35062b0, ret=0x0000000000000000) at qobjectdefs_impl.h:443:17
    frame #12: 0x00007f045d490a87 libQt5Core.so.5`QtPrivate::QSlotObjectBase::call(this=0x0000562f6f4ff9b0, r=0x0000562f6f297ea0, a=0x00007fffd35062b0) at qobjectdefs_impl.h:398:57
    frame #13: 0x00007f045d4d4290 libQt5Core.so.5`void doActivate<false>(sender=0x0000562f6f2f29f0, signal_index=3, argv=0x00007fffd35062b0) at qobject.cpp:3886:30
    frame #14: 0x00007f045d4cd6e1 libQt5Core.so.5`QMetaObject::activate(sender=0x0000562f6f2f29f0, m=0x00007f0460c2b090, local_signal_index=0, argv=0x00007fffd35062b0) at qobject.cpp:3946:26
    frame #15: 0x00007f04609a6170 libKWaylandServer.so.5`KWaylandServer::TabletToolV2Interface::cursorChanged(this=0x0000562f6f2f29f0, _t1=0x0000562f6ed30870) const at moc_tablet_v2_interface.cpp:257:5
    frame #16: 0x00007f0460a3d736 libKWaylandServer.so.5`KWaylandServer::TabletToolV2Interface::setCurrentSurface(this=0x0000562f6f2f29f0, surface=0x0000562f6eed3530) at tablet_v2_interface.cpp:244:12
    frame #17: 0x00007f04610ceb45 libkwin.so.5`KWin::TabletInputFilter::tabletToolEvent(this=0x0000562f6f522680, event=0x00007fffd3506a08) at input.cpp:1887:15
    frame #18: 0x00007f04611f86e9 libkwin.so.5`bool std::__invoke_impl<bool, bool (KWin::InputEventFilter::*&)(KWin::TabletEvent*), KWin::InputEventFilter* const&, KWin::TabletEvent*&>((null)=__invoke_memfun_deref @ 0x00007fffd3506538, __f=0x00007fffd35066e0, __t=0x0000562f6f4b96f8, __args=0x00007fffd35066f0)(KWin::TabletEvent*), KWin::InputEventFilter* const&, KWin::TabletEvent*&) at invoke.h:74:14
    frame #19: 0x00007f04611f8617 libkwin.so.5`std::__invoke_result<bool (KWin::InputEventFilter::*&)(KWin::TabletEvent*), KWin::InputEventFilter* const&, KWin::TabletEvent*&>::type std::__invoke<bool (__fn=0x00007fffd35066e0, __args=0x0000562f6f4b96f8, __args=0x00007fffd35066f0)(KWin::TabletEvent*), KWin::InputEventFilter* const&, KWin::TabletEvent*&>(bool (KWin::InputEventFilter::*&)(KWin::TabletEvent*), KWin::InputEventFilter* const&, KWin::TabletEvent*&) at invoke.h:96:14
    frame #20: 0x00007f04611f859f libkwin.so.5`bool std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)>::__call<bool, KWin::InputEventFilter* const&, 0ul, 1ul>(this=0x00007fffd35066e0, __args=0x00007fffd3506620, (null)=_Index_tuple<0, 1> @ 0x00007fffd35065c0) at functional:420:11
    frame #21: 0x00007f04611f84fb libkwin.so.5`bool std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)>::operator(this=0x00007fffd35066e0, __args=0x0000562f6f4b96f8)<KWin::InputEventFilter* const&, bool>(KWin::InputEventFilter* const&) at functional:503:17
    frame #22: 0x00007f04611f849d libkwin.so.5`bool __gnu_cxx::__ops::_Iter_pred<std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)> >::operator(this=0x00007fffd35066e0, __it=0x0000562f6f4b96f8)<KWin::InputEventFilter* const*>(KWin::InputEventFilter* const*) at predefined_ops.h:318:16
    frame #23: 0x00007f04611f8437 libkwin.so.5`KWin::InputEventFilter* const* std::__find_if<KWin::InputEventFilter* const*, __gnu_cxx::__ops::_Iter_pred<std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)> > >(__first=0x0000562f6f4b96f8, __last=0x0000562f6f4b9700, __pred=_Iter_pred<std::_Bind<bool (KWin::InputEventFilter::*(std::_Placeholder<1>, KWin::TabletEvent *))(KWin::TabletEvent *)> > @ 0x00007fffd35066e0, (null)=random_access_iterator_tag @ 0x00007fffd3506690))(KWin::TabletEvent*)> >, std::random_access_iterator_tag) at stl_algobase.h:2099:8
    frame #24: 0x00007f04611f81d6 libkwin.so.5`KWin::InputEventFilter* const* std::__find_if<KWin::InputEventFilter* const*, __gnu_cxx::__ops::_Iter_pred<std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)> > >(__first=0x0000562f6f4b9678, __last=0x0000562f6f4b9700, __pred=<unavailable>))(KWin::TabletEvent*)> >) at stl_algobase.h:2114:14
    frame #25: 0x00007f04611f814e libkwin.so.5`KWin::InputEventFilter* const* std::find_if<KWin::InputEventFilter* const*, std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)> >(__first=0x0000562f6f4b9678, __last=0x0000562f6f4b9700, __pred=<unavailable>))(KWin::TabletEvent*)>) at stl_algo.h:3910:14
    frame #26: 0x00007f04611f80b1 libkwin.so.5`bool std::none_of<KWin::InputEventFilter* const*, std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)> >(__first=0x0000562f6f4b9678, __last=0x0000562f6f4b9700, __pred=<unavailable>))(KWin::TabletEvent*)>) at stl_algo.h:471:24
    frame #27: 0x00007f04611f803d libkwin.so.5`bool std::any_of<KWin::InputEventFilter* const*, std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)> >(__first=0x0000562f6f4b9678, __last=0x0000562f6f4b9700, __pred=<unavailable>))(KWin::TabletEvent*)>) at stl_algo.h:490:15
    frame #28: 0x00007f04611f6fde libkwin.so.5`void KWin::InputRedirection::processFilters<std::_Bind<bool (KWin::InputEventFilter::* (std::_Placeholder<1>, KWin::TabletEvent*))(KWin::TabletEvent*)> >(this=0x0000562f6ee8be70, function=_Bind<bool (KWin::InputEventFilter::*(std::_Placeholder<1>, KWin::TabletEvent *))(KWin::TabletEvent *)> @ 0x00007fffd35069b0))(KWin::TabletEvent*)>) at input.h:186:9
    frame #29: 0x00007f04611f5c72 libkwin.so.5`KWin::TabletInputRedirection::tabletToolEvent(this=0x0000562f6ed78bc0, type=Proximity, pos=0x00007fffd35072d8, pressure=0, xTilt=0, yTilt=0, rotation=0, tipDown=false, tipNear=true, tabletToolId=0x00007fffd3507298, time=11150755) at tablet_input.cpp:84:14
    frame #30: 0x00007f04610da48f libkwin.so.5`QtPrivate::FunctorCall<QtPrivate::IndexesList<0, 1, 2, 3, 4, 5, 6, 7, 8, 9>, QtPrivate::List<KWin::InputRedirection::TabletEventType, QPointF const&, double, int, int, double, bool, bool, KWin::TabletToolId const&, unsigned int>, void, void (KWin::TabletInputRedirection::*)(KWin::InputRedirection::TabletEventType, QPointF const&, double, int, int, double, bool, bool, KWin::TabletToolId const&, unsigned int)>::call(f=f0 58 1f 61 04 7f 00 00 00 00 00 00 00 00 00 00, o=0x0000562f6ed78bc0, arg=0x00007fffd3506de0)(KWin::InputRedirection::TabletEventType, QPointF const&, double, int, int, double, bool, bool, KWin::TabletToolId const&, unsigned int), KWin::TabletInputRedirection*, void**) at qobjectdefs_impl.h:152:13
    frame #31: 0x00007f04610da38d libkwin.so.5`void QtPrivate::FunctionPointer<void (KWin::TabletInputRedirection::*)(KWin::InputRedirection::TabletEventType, QPointF const&, double, int, int, double, bool, bool, KWin::TabletToolId const&, unsigned int)>::call<QtPrivate::List<KWin::InputRedirection::TabletEventType, QPointF const&, double, int, int, double, bool, bool, KWin::TabletToolId const&, unsigned int>, void>(f=f0 58 1f 61 04 7f 00 00 00 00 00 00 00 00 00 00, o=0x0000562f6ed78bc0, arg=0x00007fffd3506de0)(KWin::InputRedirection::TabletEventType, QPointF const&, double, int, int, double, bool, bool, KWin::TabletToolId const&, unsigned int), KWin::TabletInputRedirection*, void**) at qobjectdefs_impl.h:185:13
    frame #32: 0x00007f04610da2d2 libkwin.so.5`QtPrivate::QSlotObject<void (KWin::TabletInputRedirection::*)(KWin::InputRedirection::TabletEventType, QPointF const&, double, int, int, double, bool, bool, KWin::TabletToolId const&, unsigned int), QtPrivate::List<KWin::InputRedirection::TabletEventType, QPointF const&, double, int, int, double, bool, bool, KWin::TabletToolId const&, unsigned int>, void>::impl(which=1, this_=0x0000562f70292940, r=0x0000562f6ed78bc0, a=0x00007fffd3506de0, ret=0x0000000000000000) at qobjectdefs_impl.h:418:17
    frame #33: 0x00007f045d490a87 libQt5Core.so.5`QtPrivate::QSlotObjectBase::call(this=0x0000562f70292940, r=0x0000562f6ed78bc0, a=0x00007fffd3506de0) at qobjectdefs_impl.h:398:57
    frame #34: 0x00007f045d4d4290 libQt5Core.so.5`void doActivate<false>(sender=0x0000562f6ef6d910, signal_index=26, argv=0x00007fffd3506de0) at qobject.cpp:3886:30
    frame #35: 0x00007f045d4cd6e1 libQt5Core.so.5`QMetaObject::activate(sender=0x0000562f6ef6d910, m=0x00007f04614d39e0, local_signal_index=23, argv=0x00007fffd3506de0) at qobject.cpp:3946:26
    frame #36: 0x00007f0460f8be25 libkwin.so.5`KWin::InputDevice::tabletToolEvent(this=0x0000562f6ef6d910, _t1=Proximity, _t2=0x00007fffd35072d8, _t3=0, _t4=0, _t5=0, _t6=0, _t7=false, _t8=true, _t9=0x00007fffd3507298, _t10=11150755) at moc_inputdevice.cpp:817:5
    frame #37: 0x00007f04612eb25e libkwin.so.5`KWin::LibInput::Connection::processEvents(this=0x0000562f6f002110) at connection.cpp:492:45
    frame #38: 0x00007f04612ff56c libkwin.so.5`KWin::LibinputBackend::LibinputBackend(this=0x00007f0450007290)::$_1::operator()() const at libinputbackend.cpp:25:23
    frame #39: 0x00007f04612ff516 libkwin.so.5`QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KWin::LibinputBackend::LibinputBackend(QObject*)::$_1>::call(f=0x00007f0450007290, arg=0x00007f040c04ffa8)::$_1&, void**) at qobjectdefs_impl.h:146:13
    frame #40: 0x00007f04612ff4e1 libkwin.so.5`void QtPrivate::Functor<KWin::LibinputBackend::LibinputBackend(QObject*)::$_1, 0>::call<QtPrivate::List<>, void>(f=0x00007f0450007290, (null)=0x0000562f6ee8f060, arg=0x00007f040c04ffa8)::$_1&, void*, void**) at qobjectdefs_impl.h:256:13
    frame #41: 0x00007f04612ff481 libkwin.so.5`QtPrivate::QFunctorSlotObject<KWin::LibinputBackend::LibinputBackend(QObject*)::$_1, 0, QtPrivate::List<>, void>::impl(which=1, this_=0x00007f0450007280, r=0x0000562f6ee8f060, a=0x00007f040c04ffa8, ret=0x0000000000000000) at qobjectdefs_impl.h:443:17
    frame #42: 0x00007f045d490a87 libQt5Core.so.5`QtPrivate::QSlotObjectBase::call(this=0x00007f0450007280, r=0x0000562f6ee8f060, a=0x00007f040c04ffa8) at qobjectdefs_impl.h:398:57
    frame #43: 0x00007f045d4c5581 libQt5Core.so.5`QMetaCallEvent::placeMetaCall(this=0x00007f040c04ff60, object=0x0000562f6ee8f060) at qobject.cpp:615:25
    frame #44: 0x00007f045d4c6533 libQt5Core.so.5`QObject::event(this=0x0000562f6ee8f060, e=0x00007f040c04ff60) at qobject.cpp:1314:31
    frame #45: 0x00007f045e49607d libQt5Widgets.so.5`QApplicationPrivate::notify_helper(this=0x0000562f6ed15e40, receiver=0x0000562f6ee8f060, e=0x00007f040c04ff60) at qapplication.cpp:3632:31
    frame #46: 0x00007f045e4932e9 libQt5Widgets.so.5`QApplication::notify(this=0x00007fffd35085e0, receiver=0x0000562f6ee8f060, e=0x00007f040c04ff60) at qapplication.cpp:2972:31
    frame #47: 0x00007f045d47e41d libQt5Core.so.5`QCoreApplication::notifyInternal2(receiver=0x0000562f6ee8f060, event=0x00007f040c04ff60) at qcoreapplication.cpp:1064:24
    frame #48: 0x00007f045d47eea2 libQt5Core.so.5`QCoreApplication::sendEvent(receiver=0x0000562f6ee8f060, event=0x00007f040c04ff60) at qcoreapplication.cpp:1462:27
    frame #49: 0x00007f045d47fc03 libQt5Core.so.5`QCoreApplicationPrivate::sendPostedEvents(receiver=0x0000000000000000, event_type=0, data=0x0000562f6ecee4d0) at qcoreapplication.cpp:1821:36
    frame #50: 0x00007f045d511c22 libQt5Core.so.5`QEventDispatcherUNIX::processEvents(this=0x0000562f6ecd9ee0, flags=(i = 36)) at qeventdispatcher_unix.cpp:468:46
    frame #51: 0x0000562f6ebd1a2e kwin_wayland`QUnixEventDispatcherQPA::processEvents(this=0x0000562f6ecd9ee0, flags=(i = 36)) at qunixeventdispatcher.cpp:63:67
    frame #52: 0x00007f045d47a97f libQt5Core.so.5`QEventLoop::processEvents(this=0x00007fffd3507cb0, flags=(i = 36)) at qeventloop.cpp:139:68
    frame #53: 0x00007f045d47ace0 libQt5Core.so.5`QEventLoop::exec(this=0x00007fffd3507cb0, flags=(i = 0)) at qeventloop.cpp:232:22
    frame #54: 0x00007f045d47ecdf libQt5Core.so.5`QCoreApplication::exec() at qcoreapplication.cpp:1375:36
    frame #55: 0x00007f045d9cad2a libQt5Gui.so.5`QGuiApplication::exec() at qguiapplication.cpp:1867:34
    frame #56: 0x00007f045e492caf libQt5Widgets.so.5`QApplication::exec() at qapplication.cpp:2824:33
    frame #57: 0x0000562f6ea88eb7 kwin_wayland`main(argc=14, argv=0x00007fffd3508838) at main_wayland.cpp:733:12
    frame #58: 0x00007f045c81ab25 libc.so.6`__libc_start_main + 213
    frame #59: 0x0000562f6ea2c7ce kwin_wayland`_start + 46

A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwayland-server/-/merge_requests/341

Git commit 5f5bea1648590f24f11ce232eb78112953a4d20e by Vlad Zahorodnii.
Committed on 10/01/2022 at 11:17.
Pushed by vladz into branch 'master'.

Store surface object in tablet cursor using QPointer

The SurfaceInterface can get destroyed and TabletCursorV2 may return a
dangling pointer.

M  +1    -1    src/server/tablet_v2_interface.cpp

https://invent.kde.org/plasma/kwayland-server/commit/5f5bea1648590f24f11ce232eb78112953a4d20e

Thanks for fixing it! I'll take a look once plasma 5.23.90 is released