Thread 1 (Thread 0x7d56e433ea40 (LWP 2004)):
[KCrash Handler]
#5  0x00007d56e33393f8 in QJSEngine::handle (this=<optimized out>, this=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsapi/qjsengine.h:320
#6  QQmlEnginePrivate::getV4Engine (e=<optimized out>, e=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/qml/qqmlengine_p.h:334
#7  QQuickStackElement::initialize (this=this@entry=0x6283e859d020, requiredProperties=requiredProperties@entry=0x0) at /usr/src/debug/qt6-declarative/qtdeclarative/src/quicktemplates/qquickstackelement.cpp:210
#8  0x00007d56e3339efb in QQuickStackElement::load (this=0x6283e859d020, parent=0x6283e87b14b0) at /usr/src/debug/qt6-declarative/qtdeclarative/src/quicktemplates/qquickstackelement.cpp:180
#9  0x00007d56e334412f in QQuickStackView::replace (this=0x6283e87b14b0, args=0x7ffcd7975b30) at /usr/src/debug/qt6-declarative/qtdeclarative/src/quicktemplates/qquickstackview.cpp:910
#10 0x00007d56e3345dac in QQuickStackView::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /usr/src/debug/qt6-declarative/build/src/quicktemplates/QuickTemplates2_autogen/include/moc_qquickstackview_p.cpp:465
#11 0x00007d56e33465d7 in QQuickStackView::qt_metacall (this=0x6283e87b14b0, _c=<optimized out>, _id=18, _a=0x7ffcd7975b50) at /usr/src/debug/qt6-declarative/build/src/quicktemplates/QuickTemplates2_autogen/include/moc_qquickstackview_p.cpp:725
#12 0x00007d56eb7542c3 in QQmlObjectOrGadget::metacall (this=<optimized out>, type=<optimized out>, index=<optimized out>, argv=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/qml/qqmlobjectorgadget.cpp:14
#13 0x00007d56eb611945 in operator() (__closure=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:3070
#14 operator()<QV4::QObjectMethod::callInternal(const QV4::Value*, const QV4::Value*, int) const::<lambda()> > (__closure=<synthetic pointer>, call=...) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:3053
#15 QV4::QObjectMethod::callInternal (this=<optimized out>, thisObject=<optimized out>, argv=0x7d56b33be560, argc=3) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4qobjectwrapper.cpp:3064
#16 0x00007d56eb66ba6e in QV4::Moth::VME::interpret (frame=0x6283e87b14b0, frame@entry=0x7ffcd7976080, engine=0x6283e29fa140, code=0x7d56b33be548 "\200B\025\350U}") at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4vme_moth.cpp:798
#17 0x00007d56eb66f584 in QV4::Moth::VME::exec (frame=<optimized out>, engine=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4vme_moth.cpp:487
#18 0x00007d56eb5c4140 in QV4::Moth::VME::exec (frame=0x7ffcd7976080, engine=0x6283e29fa140) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4engine_p.h:830
#19 qfoDoCall (fo=<optimized out>, thisObject=<optimized out>, argv=<optimized out>, argc=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4functionobject.cpp:527
#20 0x00007d56eb60515c in QV4::QObjectSlotDispatcher::impl (which=<optimized out>, this_=<optimized out>, receiver=<optimized out>, metaArgs=<optimized out>, ret=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4jscall_p.h:81
#21 0x00007d56ea1d466f in QtPrivate::QSlotObjectBase::call (this=<optimized out>, r=<optimized out>, a=<optimized out>, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobjectdefs_impl.h:461
#22 doActivate<false> (sender=<optimized out>, signal_index=<optimized out>, argv=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4157
#23 0x00007d56ebb98239 in QMetaObject::activate<void, QQuickImageBase::Status> (sender=0x6283e7676580, mo=<optimized out>, local_signal_index=2, ret=0x0) at /usr/include/qt6/QtCore/qobjectdefs.h:306
#24 QQuickImageBase::statusChanged (this=0x6283e7676580, _t1=<optimized out>) at /usr/src/debug/qt6-declarative/build/src/quick/Quick_autogen/include/moc_qquickimagebase_p.cpp:325
#25 QQuickImageBase::requestFinished (this=0x6283e7676580) at /usr/src/debug/qt6-declarative/qtdeclarative/src/quick/items/qquickimagebase.cpp:384
#26 0x00007d56ebb93c47 in QQuickImageBase::qt_metacall (this=this@entry=0x6283e7676580, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=13, _a=_a@entry=0x7ffcd7976558) at /usr/src/debug/qt6-declarative/build/src/quick/Quick_autogen/include/moc_qquickimagebase_p.cpp:293
#27 0x00007d56ebb96c3e in QQuickImage::qt_metacall (this=0x6283e7676580, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7ffcd7976558) at /usr/src/debug/qt6-declarative/build/src/quick/Quick_autogen/include/moc_qquickimage_p.cpp:249
#28 0x00007d56ea1d4aab in doActivate<false> (sender=<optimized out>, signal_index=<optimized out>, argv=<optimized out>) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qobject.cpp:4183
#29 0x00007d56ebdc349f in QQuickPixmapReply::finished (this=0x6283e9c0f6e0) at /usr/src/debug/qt6-declarative/build/src/quick/Quick_autogen/include/qquickpixmapcache.moc:123
#30 QQuickPixmapReply::event (this=0x6283e9c0f6e0, event=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/quick/util/qquickpixmapcache.cpp:1430
#31 QQuickPixmapReply::event (this=0x6283e9c0f6e0, event=<optimized out>) at /usr/src/debug/qt6-declarative/qtdeclarative/src/quick/util/qquickpixmapcache.cpp:1408
#32 0x00007d56ec301dd0 in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x6283e9c0f6e0, e=0x7d56dc1eadb0) at /usr/src/debug/qt6-base/qtbase/src/widgets/kernel/qapplication.cpp:3300
#33 0x00007d56ea168678 in QCoreApplication::notifyInternal2 (receiver=0x6283e9c0f6e0, event=event@entry=0x7d56dc1eadb0) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1106
#34 0x00007d56ea168a5b in QCoreApplication::sendEvent (receiver=<optimized out>, event=0x7d56dc1eadb0) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1546
#35 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x6283e1ddcec0) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1891
#36 0x00007d56ea4437f8 in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1744
#37 postEventSourceDispatch (s=0x6283e1de5c40) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:246
#38 0x00007d56e8c68880 in g_main_dispatch (context=0x7d56dc000f70) at ../glib/glib/gmain.c:3398
#39 0x00007d56e8c69cd7 in g_main_context_dispatch_unlocked (context=0x7d56dc000f70) at ../glib/glib/gmain.c:4249
#40 g_main_context_iterate_unlocked (context=context@entry=0x7d56dc000f70, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/glib/gmain.c:4314
#41 0x00007d56e8c69ee5 in g_main_context_iteration (context=0x7d56dc000f70, may_block=1) at ../glib/glib/gmain.c:4379
#42 0x00007d56ea43ffe2 in QEventDispatcherGlib::processEvents (this=0x6283e1de6920, flags=...) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:399
#43 0x00007d56ea174ca6 in QEventLoop::processEvents (this=0x7ffcd7976a20, flags=...) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:104
#44 QEventLoop::exec (this=0x7ffcd7976a20, flags=...) at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qeventloop.cpp:186
#45 0x00007d56ea16cd21 in QCoreApplication::exec () at /usr/src/debug/qt6-base/qtbase/src/corelib/kernel/qcoreapplication.cpp:1449
#46 0x00007d56ec2fc5ea in QApplication::exec () at /usr/src/debug/qt6-base/qtbase/src/widgets/kernel/qapplication.cpp:2567
#47 0x00006283dfff93f1 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma-workspace/plasma-workspace-6.4.4/shell/main.cpp:188

I did some further analysis on the Qt crash. This looks very much like a null dereference.

(gdb) f 7
#7  QQuickStackElement::initialize (this=this@entry=0x6283e859d020, requiredProperties=requiredProperties@entry=0x0)
    at /usr/src/debug/qt6-declarative/qtdeclarative/src/quicktemplates/qquickstackelement.cpp:210
210             QV4::ExecutionEngine *v4 = QQmlEnginePrivate::getV4Engine(engine);

(gdb) l -
195     void QQuickStackElement::initialize(RequiredProperties *requiredProperties)
196     {
197         if (!item || init)
198             return;
199
200         QQuickItemPrivate *p = QQuickItemPrivate::get(item);
201         if (!(widthValid = p->widthValid()))
202             item->setWidth(view->width());
203         if (!(heightValid = p->heightValid()))
204             item->setHeight(view->height());
(gdb) l +
205         item->setParentItem(view);
206
207         if (!properties.isUndefined()) {
208             QQmlEngine *engine = qmlEngine(view);
209             Q_ASSERT(engine);
210             QV4::ExecutionEngine *v4 = QQmlEnginePrivate::getV4Engine(engine);
211             Q_ASSERT(v4);
212             QV4::Scope scope(v4);
213             QV4::ScopedValue ipv(scope, properties.value());
214             QV4::Scoped<QV4::QmlContext> qmlContext(scope, qmlCallingContext.value());
(gdb) l +
215             QV4::ScopedValue qmlObject(scope, QV4::QObjectWrapper::wrap(v4, item));
216             QQmlComponentPrivate::setInitialProperties(
217                 v4, qmlContext, qmlObject, ipv, requiredProperties, item,
218                 component ? QQmlComponentPrivate::get(component)->state.creator() : nullptr);
219             properties.clear();
220         }
221
222         if (requiredProperties && !requiredProperties->empty()) {
223             QString error;
224             for (const auto &property: *requiredProperties) {

(gdb) p view
$47 = (QQuickStackView *) 0x6283e87b14b0
(gdb) p engine
$46 = (QQmlEngine *) 0x0

(gdb) disassemble/s $pc-64, $pc+64
Dump of assembler code from 0x7d56e33393b8 to 0x7d56e3339438:
/usr/src/debug/qt6-declarative/qtdeclarative/src/quicktemplates/qquickstackelement.cpp:
203         if (!(heightValid = p->heightValid()))
   0x00007d56e33393b8 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+104>:  imul   $0x24748b49,(%rcx),%eax

204             item->setHeight(view->height());
205         item->setParentItem(view);
   0x00007d56e33393be <_ZN18QQuickStackElement10initializeEP18RequiredProperties+110>:  js     0x7d56e3339409 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+185>
   0x00007d56e33393c0 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+112>:  mov    0x40(%rsp),%edi
   0x00007d56e33393c4 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+116>:  call   *0x132bbe(%rip)        # 0x7d56e346bf88

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4persistent_p.h:
113         bool isUndefined() const { return !val || val->isUndefined(); }
   0x00007d56e33393ca <_ZN18QQuickStackElement10initializeEP18RequiredProperties+122>:  mov    0x98(%r12),%rax
   0x00007d56e33393d2 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+130>:  test   %rax,%rax
   0x00007d56e33393d5 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+133>:  je     0x7d56e3339507 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+439>

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/common/qv4staticvalue_p.h:
287         inline bool isUndefined() const { return _val == 0; }
   0x00007d56e33393db <_ZN18QQuickStackElement10initializeEP18RequiredProperties+139>:  cmpq   $0x0,(%rax)
   0x00007d56e33393df <_ZN18QQuickStackElement10initializeEP18RequiredProperties+143>:  je     0x7d56e3339507 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+439>

/usr/src/debug/qt6-declarative/qtdeclarative/src/quicktemplates/qquickstackelement.cpp:
208             QQmlEngine *engine = qmlEngine(view);
   0x00007d56e33393e5 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+149>:  mov    0x78(%r12),%rdi
   0x00007d56e33393ea <_ZN18QQuickStackElement10initializeEP18RequiredProperties+154>:  call   *0x132900(%rip)        # 0x7d56e346bcf0

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsapi/qjsengine.h:
320         QV4::ExecutionEngine *handle() const { return m_v4Engine; }
   0x00007d56e33393f0 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+160>:  mov    0x98(%r12),%rdx
=> 0x00007d56e33393f8 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+168>:  mov    0x10(%rax),%r13

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4scopedvalue_p.h:
66          explicit Scope(ExecutionEngine *e)
   0x00007d56e33393fc <_ZN18QQuickStackElement10initializeEP18RequiredProperties+172>:  xor    %eax,%eax

67              : engine(e)
68              , mark(engine->jsStackTop)
   0x00007d56e33393fe <_ZN18QQuickStackElement10initializeEP18RequiredProperties+174>:  mov    0x8(%r13),%r15

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4persistent_p.h:
90              return (val ? val->asReturnedValue() : Encode::undefined());
   0x00007d56e3339402 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+178>:  test   %rdx,%rdx
   0x00007d56e3339405 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+181>:  je     0x7d56e333940a <_ZN18QQuickStackElement10initializeEP18RequiredProperties+186>

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/common/qv4staticvalue_p.h:
452         constexpr ReturnedValue asReturnedValue() const { return _val; }
   0x00007d56e3339407 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+183>:  mov    (%rdx),%rax

130         QV4_NEARLY_ALWAYS_INLINE constexpr void setRawValue(quint64 raw) { _val = raw; }
   0x00007d56e333940a <_ZN18QQuickStackElement10initializeEP18RequiredProperties+186>:  mov    %rax,(%r15)

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4persistent_p.h:
90              return (val ? val->asReturnedValue() : Encode::undefined());
   0x00007d56e333940d <_ZN18QQuickStackElement10initializeEP18RequiredProperties+189>:  mov    0xa0(%r12),%rax

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4engine_p.h:
167             jsStackTop = ptr + nValues;
   0x00007d56e3339415 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+197>:  lea    0x10(%r15),%rdx

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4persistent_p.h:
90              return (val ? val->asReturnedValue() : Encode::undefined());
   0x00007d56e3339419 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+201>:  test   %rax,%rax
   0x00007d56e333941c <_ZN18QQuickStackElement10initializeEP18RequiredProperties+204>:  je     0x7d56e3339c0f <_ZN18QQuickStackElement10initializeEP18RequiredProperties+2239>

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/common/qv4staticvalue_p.h:
452         constexpr ReturnedValue asReturnedValue() const { return _val; }
   0x00007d56e3339422 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+210>:  mov    (%rax),%rax

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/jsruntime/qv4engine_p.h:
167             jsStackTop = ptr + nValues;
   0x00007d56e3339425 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+213>:  mov    %rdx,0x8(%r13)

/usr/src/debug/qt6-declarative/qtdeclarative/src/qml/common/qv4staticvalue_p.h:
315         inline bool isManagedOrUndefined() const { return (_val & ManagedMask) == 0; }
   0x00007d56e3339429 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+217>:  movabs $0x7ff1000000000000,%rdx
   0x00007d56e3339433 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+227>:  test   %rdx,%rax
   0x00007d56e3339436 <_ZN18QQuickStackElement10initializeEP18RequiredProperties+230>:  jne    0x7d56e333945d <_ZN18QQuickStackElement10initializeEP18RequiredProperties+269>
End of assembler dump.

We are doing MOV 0x10(%rax), %r13 with %rax = 0x0.

I'm not sure why qmlEngine(view) returned null, as I'm working from a coredump.
Although I was previously able to reproduce this issue on the same device, currently I am unable to.

I would appreciate if someone could help me out re-filing this issue and potentially submitting it upstream.
I do not have any accounts for that, nor do I know whether it is relevant.

I just had this same crash again, but unrelated to Media Player. Renaming and refiling as generic-crash.

Sep 08 17:29:31 plasmashell[2017]: qrc:/qt/qml/org/kde/kirigami/dialogs/PromptDialog.qml:138: TypeError: Cannot read property 'Success' of undefined
Sep 08 17:29:31 plasmashell[2017]: qrc:/qt/qml/org/kde/kirigami/dialogs/PromptDialog.qml:100: TypeError: Cannot read property 'None' of undefined
Sep 08 17:29:31 plasmashell[2017]: KCrash: Application 'plasmashell' crashing... crashRecursionCounter = 2
Sep 08 17:29:31 systemd-coredump[21798]: Process 2017 (plasmashell) of user 1000 terminated abnormally with signal 11/SEGV, processing...

*** Bug 509154 has been marked as a duplicate of this bug. ***

*** Bug 509175 has been marked as a duplicate of this bug. ***

*** Bug 509194 has been marked as a duplicate of this bug. ***

I found a couple more crashes like this.
All have in common that Qt Version 6.9.2 is used.
All crashes occur due to a QQuickImage usage.

Bug 509154 contains a Sentry crash report.

*** Bug 509193 has been marked as a duplicate of this bug. ***

I just opened an upstream Qt bug for this issue here:
https://bugreports.qt.io/browse/QTBUG-140018

If anybody can provide further information, for example:
* How to reproduce the bug?
* Why does `call qmlEngine(view)` return null in frame 7?

That would be very much appreciated!

(In reply to mydarkstar from comment #7)
> I found a couple more crashes like this.
> All have in common that Qt Version 6.9.2 is used.
> All crashes occur due to a QQuickImage usage.
> 
> Bug 509154 contains a Sentry crash report.

I was the one to originally file the bug. 

I updated the laptop using apt full-upgrade, then ran flatpak update and rebooted afterwards. 

I log in and immediately the crash starts happening without launching anything. Drkonqi launches about 10 crash reports withing a minute of launch and then plasmashell starts going in a crash loop. 

I have the Nord VPN client on auto start but even disabling it did not seem to have an effect. I tried switching to X11 and the same seems to be happening using that as well. I do not have Clementine installed as someone else has mentioned.

Hi,
I was able to make it go away by resetting the Global theme to the default.
You want to try, it worked for me after few months of struggle.
Best

(In reply to mateMat from comment #11)
> Hi,
> I was able to make it go away by resetting the Global theme to the default.
> You want to try, it worked for me after few months of struggle.
> Best

Just tried it, didn't seem to have any impact. Applied the defaults to layout and appearance. Thanks for the suggestion though.

I'm getting this too, not sure of the direct cause. I certainly don't use Clementine. One thing's certain: once it starts happening, plasmashell keeps crashing in a loop, no matter how many times you restart it.

One time it was happening all the time right after login, but after rebooting it was okay for 6 days of uptime, then just now randomly started happening again, and it started after I clicked on the notification applet and scrolled down my notification list. I don't see anything uniquely common printed in journal before crashing either (and nothing about any images logged at all).

I want to note that this is a regression when updating to Qt 6.9.2, released at the end of August (~2 weeks ago).

I originally assumed that this crash had to do with the Media Player widget, but have since revised that.
The original issue summary can be disregarded.

We will have to wait for the issue to be resolved in Qt.

*** Bug 509340 has been marked as a duplicate of this bug. ***

See also https://crash-reports.kde.org/organizations/kde/issues/240550

I can reproduce the issue in ArchLinux with plasmashell 6.4.5. Here are the steps to reproduce the issue - open dolphin > click on any audio file > opens vlc > plasmashell crash. The issue does not happen if vlc is already running. I have attached a plasmashell-gdb-output.txt file with the stack trace. Please let me know if I need to provide more info.

Created attachment 184930 [details]
stack trace from gdb running plasmashell

Just started to see this today after a reboot for KF 6.18.0 updates on Arch.
Qt 6.9.2 and plasma 6.4.5 was installed yesterday and working fine until now.

No new applications started, no new widgets or styles used. No clementine, no vlc or anything. All plain default breeze.

*** Bug 509507 has been marked as a duplicate of this bug. ***

*** Bug 509443 has been marked as a duplicate of this bug. ***

*** Bug 509436 has been marked as a duplicate of this bug. ***

Does setting `QV4_GC_TIMELIMIT=0` help?

A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/5817

*** Bug 509472 has been marked as a duplicate of this bug. ***

(In reply to Biswapriyo Nath from comment #17)
> I can reproduce the issue in ArchLinux with plasmashell 6.4.5.

I originally asked this user to report their findings with the VLC crash relation here.

I've now asked this user externally to see if the crash stops happening with the mediacontrollerr tray applet disabled, and they have confirmed this is the case. It's now relatively certain that the mediacontroller applet is responsible.

I am able to reproduce this with the Clementine flatpak, by playing a song with album art, and restarting plasmashell — it enters a crash loop with the same backtrace.

*** Bug 509433 has been marked as a duplicate of this bug. ***

*** Bug 509536 has been marked as a duplicate of this bug. ***

*** Bug 509565 has been marked as a duplicate of this bug. ***

Maybe it's a bit too early to say confidently, but disabling the Media Player System Tray plugin seems to fix the problem.
My last crash (before disabling) was when I played some music in Firefox.
I'll write if I get another crash with the same stacktrace.

To disable it: click Status and Notification arrow, then "Configure system tray" in the upper right corner, then tab "Entry", and there will be "Media Player".

*** Bug 509592 has been marked as a duplicate of this bug. ***

*** Bug 509585 has been marked as a duplicate of this bug. ***

*** Bug 509575 has been marked as a duplicate of this bug. ***

*** Bug 509576 has been marked as a duplicate of this bug. ***

*** Bug 509619 has been marked as a duplicate of this bug. ***

After bisecting qtdeclarative, I've identified the cause as https://invent.kde.org/qt/qt/qtdeclarative/-/commit/f68cfe5ceb903f2091b2ce23032823a863f184c7 (Loader: Also drop engine when clearing contexts recursively).

A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/5821

*** Bug 509578 has been marked as a duplicate of this bug. ***

*** Bug 509631 has been marked as a duplicate of this bug. ***

*** Bug 509647 has been marked as a duplicate of this bug. ***

*** Bug 509661 has been marked as a duplicate of this bug. ***

Created attachment 185090 [details]
Frequency

This almost always occurs to me after resuming from KScreenLocker. The last time it occurred, it did so to such an extent that I can't even use Application Launcher any more.

*** Bug 509675 has been marked as a duplicate of this bug. ***

*** Bug 509203 has been marked as a duplicate of this bug. ***

*** Bug 509523 has been marked as a duplicate of this bug. ***

*** Bug 509721 has been marked as a duplicate of this bug. ***

*** Bug 509723 has been marked as a duplicate of this bug. ***

*** Bug 509742 has been marked as a duplicate of this bug. ***

*** Bug 509745 has been marked as a duplicate of this bug. ***

Hi, my report was marked as duplicate of this bug.
Just wanted to tell you how I solved it:

1. try creating a new user account -> no issue
2. move .cache and $HOME/.config/plasma-org.kde.plasma.desktop-appletsrc to other locations, logout, login -> no issue
3. move .cache back -> no issue
4. analyze the diff between the newly generated plasma-org.kde.plasma.desktop-appletsrc and the fauly backup -> org.kde.snow was suspect
5. replace the newly generated file with the fauly backup, remove any mention of org.kde.snow -> no issue

*** Bug 509751 has been marked as a duplicate of this bug. ***

*** Bug 509774 has been marked as a duplicate of this bug. ***

*** Bug 509713 has been marked as a duplicate of this bug. ***

(In reply to Jack from comment #51)
> Hi, my report was marked as duplicate of this bug.
> Just wanted to tell you how I solved it:
> 
> 1. try creating a new user account -> no issue
> 2. move .cache and $HOME/.config/plasma-org.kde.plasma.desktop-appletsrc to
> other locations, logout, login -> no issue
> 3. move .cache back -> no issue
> 4. analyze the diff between the newly generated
> plasma-org.kde.plasma.desktop-appletsrc and the fauly backup -> org.kde.snow
> was suspect
> 5. replace the newly generated file with the fauly backup, remove any
> mention of org.kde.snow -> no issue

I just tried this. org.kde.snow was not present in my $HOME/.config/plasma-org.kde.plasma.desktop-appletsrc likely because I reset my KDE config when this bug arose 2-3 weeks ago.

I still get these plasmashell crashes multiple times per day. It's very irritating. Watching a YouTube video in Chromium is the most reliable trigger for the crash. It triggers seemingly at random at other times.

(In reply to Robin Edmunds from comment #55)
 
> I still get these plasmashell crashes multiple times per day. It's very
> irritating. Watching a YouTube video in Chromium is the most reliable
> trigger for the crash. It triggers seemingly at random at other times.

I also was getting multiple crashes on two machines, this worked for me.
Disable the mediaplayer applet,

*** Bug 509790 has been marked as a duplicate of this bug. ***

*** Bug 509794 has been marked as a duplicate of this bug. ***

*** Bug 509203 has been marked as a duplicate of this bug. ***

*** Bug 509799 has been marked as a duplicate of this bug. ***

(In reply to dexter from comment #56)
> (In reply to Robin Edmunds from comment #55)
>  
> > I still get these plasmashell crashes multiple times per day. It's very
> > irritating. Watching a YouTube video in Chromium is the most reliable
> > trigger for the crash. It triggers seemingly at random at other times.
> 
> I also was getting multiple crashes on two machines, this worked for me.
> Disable the mediaplayer applet,

This seems to have mitigated the crashes. Thank you!

*** Bug 509820 has been marked as a duplicate of this bug. ***

*** Bug 509641 has been marked as a duplicate of this bug. ***

*** Bug 509834 has been marked as a duplicate of this bug. ***

*** Bug 509839 has been marked as a duplicate of this bug. ***

*** Bug 509840 has been marked as a duplicate of this bug. ***

*** Bug 509850 has been marked as a duplicate of this bug. ***

(In reply to Robin Edmunds from comment #61)
> (In reply to dexter from comment #56)
> > (In reply to Robin Edmunds from comment #55)
> >  
> > > I still get these plasmashell crashes multiple times per day. It's very
> > > irritating. Watching a YouTube video in Chromium is the most reliable
> > > trigger for the crash. It triggers seemingly at random at other times.
> > 
> > I also was getting multiple crashes on two machines, this worked for me.
> > Disable the mediaplayer applet,
> 
> This seems to have mitigated the crashes. Thank you!

+1 thanks for the workaround

*** Bug 509862 has been marked as a duplicate of this bug. ***

*** Bug 509864 has been marked as a duplicate of this bug. ***

*** Bug 509866 has been marked as a duplicate of this bug. ***

(In reply to Gill Bates from comment #68)
> (In reply to Robin Edmunds from comment #61)
> > (In reply to dexter from comment #56)
> > > (In reply to Robin Edmunds from comment #55)
> > >  
> > > > I still get these plasmashell crashes multiple times per day. It's very
> > > > irritating. Watching a YouTube video in Chromium is the most reliable
> > > > trigger for the crash. It triggers seemingly at random at other times.
> > > 
> > > I also was getting multiple crashes on two machines, this worked for me.
> > > Disable the mediaplayer applet,
> > 
> > This seems to have mitigated the crashes. Thank you!
> 
> +1 thanks for the workaround

Turning off hardware video decoding in the (chrome:flags) is also a possible workaround.

(In reply to Gustavo from comment #72)

I doubt it, because this also occurs to my brother and I, who don't utilise Chromium.

A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/5844

I can confirm this too. When I start watching YouTube videos, plasmashell starts crashing.

No "Media Player System Tray plugin" - no crashes for a week.

Created attachment 185219 [details]
Stacktrace of plasmashell crash retrieved using coredumpctl gdb

I was away for a bit and yesterday faced this exact issue of plasma just endlessly crashing when I tried to load a video lecture on an educational website on chromium. It was weird as I couldn't reproduce this consistently with any YT videos, and I had the site as PWA (that was also set to autostart - might have been the reason for my plasma crash at logon that happened occasionally) so I  incorrectly blamed it being PWA or the active extensions or some other quirk of the latest chromium build. Anyway grabbed the stacktrace eventually and decided to report here . Glad to see others have investigated into it already (Thanks for the hard work, really appreciate it :-)).

FWIW I now have a bunch of log entries as well, and I'm attaching the latest stacktrace in case it might be of any further help. Also I can confirm that disabling the media widget from system tray of the panel no longer triggers the issue.

Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.7-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × AMD Ryzen 5 3500U with Radeon Vega Mobile Gfx
Memory: 20 GiB of RAM (17.5 GiB usable)
Graphics Processor: AMD Radeon Vega 8 Graphics
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: VivoBook_ASUSLaptop X512DA_X512DA
System Version: 1.0

*** Bug 509884 has been marked as a duplicate of this bug. ***

Git commit 30273fb2afcc6e304951c8895bb17d38255fed39 by Oliver Beard.
Committed on 24/09/2025 at 20:53.
Pushed by olib into branch 'master'.

applets/mediacontroller: Workaround for common crash in QQuickStackView

This commit adds a workaround for QTBUG-140018 where a regression in Qt 6.9.2 causes a segfault as qmlEngine(view) returns null in QQuickStackElement::initialize, because a parent loader set the engine to null when unloading, but we still run.

We avoid this by not pushing a new Image to the StackView when it isn't visible, which is coincident with the above and the cause of the crash.

This does not regress any behaviour, functionality or animation.

Co-authored-by: David Edmundson <kde@davidedmundson.co.uk>

M  +10   -0    applets/mediacontroller/AlbumArtStackView.qml

https://invent.kde.org/plasma/plasma-workspace/-/commit/30273fb2afcc6e304951c8895bb17d38255fed39

Git commit d9e2215bb5c19391c8a978d9fe939a6647b8d7b9 by Oliver Beard.
Committed on 24/09/2025 at 21:32.
Pushed by olib into branch 'Plasma/6.5'.

applets/mediacontroller: Workaround for common crash in QQuickStackView

This commit adds a workaround for QTBUG-140018 where a regression in Qt 6.9.2 causes a segfault as qmlEngine(view) returns null in QQuickStackElement::initialize, because a parent loader set the engine to null when unloading, but we still run.

We avoid this by not pushing a new Image to the StackView when it isn't visible, which is coincident with the above and the cause of the crash.

This does not regress any behaviour, functionality or animation.

Co-authored-by: David Edmundson <kde@davidedmundson.co.uk>


(cherry picked from commit 30273fb2afcc6e304951c8895bb17d38255fed39)

Co-authored-by: Oliver Beard <olib141@outlook.com>

M  +10   -0    applets/mediacontroller/AlbumArtStackView.qml

https://invent.kde.org/plasma/plasma-workspace/-/commit/d9e2215bb5c19391c8a978d9fe939a6647b8d7b9

Git commit 4d7b4be9722d6a1c1d84d817066b424117dadde4 by Oliver Beard.
Committed on 24/09/2025 at 21:31.
Pushed by olib into branch 'Plasma/6.4'.

applets/mediacontroller: Workaround for common crash in QQuickStackView

This commit adds a workaround for QTBUG-140018 where a regression in Qt 6.9.2 causes a segfault as qmlEngine(view) returns null in QQuickStackElement::initialize, because a parent loader set the engine to null when unloading, but we still run.

We avoid this by not pushing a new Image to the StackView when it isn't visible, which is coincident with the above and the cause of the crash.

This does not regress any behaviour, functionality or animation.

Co-authored-by: David Edmundson <kde@davidedmundson.co.uk>


(cherry picked from commit 30273fb2afcc6e304951c8895bb17d38255fed39)

Co-authored-by: Oliver Beard <olib141@outlook.com>

M  +10   -0    applets/mediacontroller/AlbumArtStackView.qml

https://invent.kde.org/plasma/plasma-workspace/-/commit/4d7b4be9722d6a1c1d84d817066b424117dadde4

Will the workaround work with Qt 6.10 too? I'm using Plasma 6.5 beta with Qt 6.10 rc1 on Arch Linux and Plasma crashes in a loop when Elisa player starts playback. The crashes do not occur if Media Player applet is disabled in the system tray settings.

(In reply to Patrick Silva from comment #82)
> Will the workaround work with Qt 6.10 too?

I expect that it should do, yes.

*** Bug 509919 has been marked as a duplicate of this bug. ***

*** Bug 509986 has been marked as a duplicate of this bug. ***

*** Bug 509992 has been marked as a duplicate of this bug. ***

*** Bug 510023 has been marked as a duplicate of this bug. ***

*** Bug 509900 has been marked as a duplicate of this bug. ***

*** Bug 510220 has been marked as a duplicate of this bug. ***

*** Bug 509453 has been marked as a duplicate of this bug. ***

Please see the comment: https://bugs.kde.org/show_bug.cgi?id=509175#c3

*** Bug 510455 has been marked as a duplicate of this bug. ***

*** Bug 510473 has been marked as a duplicate of this bug. ***

*** Bug 510619 has been marked as a duplicate of this bug. ***

*** Bug 510661 has been marked as a duplicate of this bug. ***

*** Bug 510728 has been marked as a duplicate of this bug. ***

*** Bug 510801 has been marked as a duplicate of this bug. ***

I'm running the latest version of KDE Neon, applying and rebooting updates as soon as they're available, yet I am still getting this crash, despite this very log is saying the issue(s) are fixed. What gives?

How do I apply this fix? I can ge sitting at desktop, idle and I get this crash.

As the "Version fixed in" field says:

> Worked around in Plasma 6.4.6 and later; fixed in Qt 6.10.1 and later

KDE neon user edition doesn't have either of those versions, because they haven't been released yet.

Your options include:
- Wait for Plasma 6.4.6 or Qt 6.10.1 to be released, then upgrade your system.
- Re-install with NDE neon's "Testing" edition, which ships the tip of the Plasma/6.4 branch, which will become Plasma 6.4.6 and therefore already has the fix integrated.
- Find a way to switch the repos of your existing neon install to the "Testing" repos, do so, and hope everything works (AFAIK this is untested)
- Reinstall with another distro that has one of the above
- Compile Plasma or Qt from source on your system including the patches the fixed the issue

*** Bug 510805 has been marked as a duplicate of this bug. ***

*** Bug 510830 has been marked as a duplicate of this bug. ***

*** Bug 510888 has been marked as a duplicate of this bug. ***

Created attachment 186006 [details]
crash log 1

Linux/KDE Plasma: NixOS 25.05
KDE Plasma Version: 6.3.6
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.2
Graphics Platform: X11

Opening a video in the FreeTube app crashes plasma shell and it keeps crashing and crashing until I restart it from terminal (if I'm lucky) or I force reboot. It happens all the time when watching videos in the FreeTube desktop app.

I managed to capture 2 crash logs that I'm attaching

Created attachment 186007 [details]
crash log 2

(In reply to letsdiskuss from comment #103)
> Linux/KDE Plasma: NixOS 25.05
> KDE Plasma Version: 6.3.6
> KDE Frameworks Version: 6.14.0
> Qt Version: 6.9.2
> Graphics Platform: X11

As noted in the Version Fixed In field, this crash is worked around in Plasma 6.4.6 and later; fixed in Qt 6.10.1 and later
If you still experiencing this crash when your system has updated to those versions, please make a note with a new backtrace. Thanks.

*** Bug 511195 has been marked as a duplicate of this bug. ***

*** Bug 511369 has been marked as a duplicate of this bug. ***

*** Bug 511508 has been marked as a duplicate of this bug. ***