System Monitor reproducibly crashes, but DrKonqi never notices

rokejulianlockhart · March 18, 2024, 2:59pm

Due to How can System Monitor report that a process is using less memory than the sum of its child processes'?, I’ve been using plasma-systemmonitor more than I usually do.

Although the “Details sidebar”

Screenshot_20240318_150040711×619 68.1 KB

used to be possible to enable, sometime before or during the update to https://download.opensuse.org/repositories/openSUSE:/Factory/standard/x86_64/plasma6-systemmonitor-6.0.2-1.1.x86_64.rpm and cpe:/o:opensuse:tumbleweed:20240315, a bug was introduced, which causes plasma-systemmonitor to crash if that button / context menu entry is invoked.

However, drkonqi never notices. Is there a way to manually get it to capture what I’m doing, like I can on Windows with OfficeDocs-Support/Office/Client/settings/how-to-use-problem-steps-recorder.md at 9693e4dd6705089534b965f94a6254a6ccd98fe1 · MicrosoftDocs/OfficeDocs-Support · GitHub (an example, considering that both save diagnostics too)?

I really doubt that a Log in to KDE Bugtracking System would be useful without a trace.

Duha · March 18, 2024, 5:16pm

This is already tracked here: 482169 – System Monitor in Plasma 6 crashes on clicking "Show Details Sidebar"

Would be interesting how to get the backtrace.
Edit:
Actually it is very simple using gdb:

gdb plasma-systemmonitor
run
Use debuginfod or not
Create the crash
bt

Or use coredumpctl since it shows up there too.

rokejulianlockhart · March 18, 2024, 7:27pm

@Duha, thanks. I’m gonna use gbd with debuginfod an awful lot from now onward:

```
gdb plasma-systemmonitor
```

GNU gdb (GDB; openSUSE Tumbleweed) 13.2
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For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from plasma-systemmonitor...

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.opensuse.org/>
Enable debuginfod for this session? (y or [n]) y
Debuginfod has been enabled.
To make this setting permanent, add 'set debuginfod enabled on' to .gdbinit.
(No debugging symbols found in plasma-systemmonitor)                                                                                                                                                                                                                           
Missing separate debuginfos, use: zypper install plasma6-systemmonitor-debuginfo-6.0.2-1.1.x86_64
(gdb) run
Starting program: /usr/bin/plasma-systemmonitor 
[Thread debugging using libthread_db enabled]                                                                                                                                                                                                                                  
Using host libthread_db library "/lib64/libthread_db.so.1".
Detected locale "C" with character encoding "ANSI_X3.4-1968", which is not UTF-8.                                                                                                                                                                                              
Qt depends on a UTF-8 locale, and has switched to "C.UTF-8" instead.
If this causes problems, reconfigure your locale. See the locale(1) manual
for more information.
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qt.qml.typeresolution.cycle: Cyclic dependency detected between "qrc:/qt/qml/org/kde/desktop/private/TextFieldContextMenu.qml" and "qrc:/qt/qml/org/kde/desktop/MenuItem.qml"                                                                                                  
qrc:/qt/qml/org/kde/ksysguard/page/EditablePage.qml?page=history.page:223:9: QML Loader: Binding loop detected for property "height"                                                                                                                                           
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file:///usr/lib64/qt6/qml/org/kde/kirigami/Dialog.qml:334:18: QML ScrollView: Binding loop detected for property "calculatedImplicitWidth"                                                                                                                                     
[Detaching after fork from child process 15521]
file:///usr/lib64/qt6/qml/org/kde/kirigami/Dialog.qml:386:33: QML Binding: Binding loop detected for property "target"
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Thread 1 "plasma-systemmo" received signal SIGSEGV, Segmentation fault.
0x00007ffff2005fc0 in QQuickItem::parentItem() const () from /lib64/libQt6Quick.so.6
(gdb) bt
#0  0x00007ffff2005fc0 in QQuickItem::parentItem() const () at /lib64/libQt6Quick.so.6
#1  0x00007ffff17b3bfa in  () at /lib64/libQt6QuickTemplates2.so.6
#2  0x00007ffff17b69a6 in  () at /lib64/libQt6QuickTemplates2.so.6
#3  0x00007ffff5fda593 in  () at /lib64/libQt6Core.so.6
#4  0x00007ffff2014150 in QQuickItemPrivate::setEffectiveEnableRecur(QQuickItem*, bool) () at /lib64/libQt6Quick.so.6
#5  0x00007ffff2014150 in QQuickItemPrivate::setEffectiveEnableRecur(QQuickItem*, bool) () at /lib64/libQt6Quick.so.6
#6  0x00007ffff2014150 in QQuickItemPrivate::setEffectiveEnableRecur(QQuickItem*, bool) () at /lib64/libQt6Quick.so.6
#7  0x00007ffff2014150 in QQuickItemPrivate::setEffectiveEnableRecur(QQuickItem*, bool) () at /lib64/libQt6Quick.so.6
#8  0x00007ffff2014150 in QQuickItemPrivate::setEffectiveEnableRecur(QQuickItem*, bool) () at /lib64/libQt6Quick.so.6
#9  0x00007ffff200aaac in QQuickItem::setParentItem(QQuickItem*) () at /lib64/libQt6Quick.so.6
#10 0x00007ffff20395b5 in  () at /lib64/libQt6Quick.so.6
#11 0x00007ffff72f1b0a in QQmlIncubatorPrivate::incubate(QQmlInstantiationInterrupt&) () at /lib64/libQt6Qml.so.6
#12 0x00007ffff72f2174 in QQmlEnginePrivate::incubate(QQmlIncubator&, QQmlRefPointer<QQmlContextData> const&) () at /lib64/libQt6Qml.so.6
#13 0x00007ffff72a558e in QQmlComponent::create(QQmlIncubator&, QQmlContext*, QQmlContext*) () at /lib64/libQt6Qml.so.6
#14 0x00007ffff20349c0 in  () at /lib64/libQt6Quick.so.6
#15 0x00007ffff20390ed in QQuickLoader::setActive(bool) () at /lib64/libQt6Quick.so.6
#16 0x00007ffff7278544 in  () at /lib64/libQt6Qml.so.6
#17 0x00007ffff728d076 in  () at /lib64/libQt6Qml.so.6
#18 0x00007ffff728ba8a in QQmlBinding::doUpdate(QQmlJavaScriptExpression::DeleteWatcher const&, QFlags<QQmlPropertyData::WriteFlag>, QV4::Scope&) () at /lib64/libQt6Qml.so.6
#19 0x00007ffff7289a64 in QQmlBinding::update(QFlags<QQmlPropertyData::WriteFlag>) () at /lib64/libQt6Qml.so.6
#20 0x00007ffff73133f8 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /lib64/libQt6Qml.so.6
#21 0x00007ffff5fd9fd8 in  () at /lib64/libQt6Core.so.6
#22 0x00007ffff732289a in QQmlOpenMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at /lib64/libQt6Qml.so.6
#23 0x00007ffff727858a in  () at /lib64/libQt6Qml.so.6
#24 0x00007ffff732e05c in QQmlPropertyPrivate::write(QObject*, QQmlPropertyData const&, QVariant const&, QQmlRefPointer<QQmlContextData> const&, QFlags<QQmlPropertyData::WriteFlag>) () at /lib64/libQt6Qml.so.6
#25 0x00007ffff71f8f1d in QV4::QObjectWrapper::setProperty(QV4::ExecutionEngine*, QObject*, QQmlPropertyData const*, QV4::Value const&) () at /lib64/libQt6Qml.so.6
#26 0x00007ffff71f95be in QV4::QObjectWrapper::setQmlProperty(QV4::ExecutionEngine*, QQmlRefPointer<QQmlContextData> const&, QObject*, QV4::String*, QFlags<QV4::QObjectWrapper::Flag>, QV4::Value const&) () at /lib64/libQt6Qml.so.6
#27 0x00007ffff71f973d in QV4::QObjectWrapper::virtualPut(QV4::Managed*, QV4::PropertyKey, QV4::Value const&, QV4::Value*) () at /lib64/libQt6Qml.so.6
#28 0x00007ffff71dd930 in QV4::Object::virtualResolveLookupSetter(QV4::Object*, QV4::ExecutionEngine*, QV4::Lookup*, QV4::Value const&) () at /lib64/libQt6Qml.so.6
#29 0x00007ffff724966a in  () at /lib64/libQt6Qml.so.6
#30 0x00007ffff724c344 in  () at /lib64/libQt6Qml.so.6
#31 0x00007ffff71bd62e in  () at /lib64/libQt6Qml.so.6
#32 0x00007ffff71c049d in QV4::Function::call(QObject*, void**, QMetaType const*, int, QV4::ExecutionContext*) () at /lib64/libQt6Qml.so.6
#33 0x00007ffff72f3265 in QQmlJavaScriptExpression::evaluate(void**, QMetaType const*, int) () at /lib64/libQt6Qml.so.6
#34 0x00007ffff728f227 in QQmlBoundSignalExpression::evaluate(void**) () at /lib64/libQt6Qml.so.6
--Type <RET> for more, q to quit, c to continue without paging--c
#35 0x00007ffff7293a7b in  () at /lib64/libQt6Qml.so.6
#36 0x00007ffff73133f8 in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () at /lib64/libQt6Qml.so.6
#37 0x00007ffff5fd9fd8 in  () at /lib64/libQt6Core.so.6
#38 0x00007ffff16e67c2 in QQuickAction::toggled(QObject*) () at /lib64/libQt6QuickTemplates2.so.6
#39 0x00007ffff16ebc03 in  () at /lib64/libQt6QuickTemplates2.so.6
#40 0x00007ffff16ebe60 in QQuickAbstractButtonPrivate::trigger(bool) () at /lib64/libQt6QuickTemplates2.so.6
#41 0x00007ffff16ed68a in QQuickAbstractButtonPrivate::handleRelease(QPointF const&, unsigned long) () at /lib64/libQt6QuickTemplates2.so.6
#42 0x00007ffff1704eb9 in QQuickControl::mouseReleaseEvent(QMouseEvent*) () at /lib64/libQt6QuickTemplates2.so.6
#43 0x00007ffff201cd83 in QQuickItem::event(QEvent*) () at /lib64/libQt6Quick.so.6
#44 0x00007ffff77c1aae in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt6Widgets.so.6
#45 0x00007ffff5f87498 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt6Core.so.6
#46 0x00007ffff216fc1b in QQuickDeliveryAgentPrivate::deliverMatchingPointsToItem(QQuickItem*, bool, QPointerEvent*, bool) () at /lib64/libQt6Quick.so.6
#47 0x00007ffff21719b6 in QQuickDeliveryAgentPrivate::deliverUpdatedPoints(QPointerEvent*) () at /lib64/libQt6Quick.so.6
#48 0x00007ffff2173203 in QQuickDeliveryAgentPrivate::deliverPointerEvent(QPointerEvent*) () at /lib64/libQt6Quick.so.6
#49 0x00007ffff217430c in QQuickDeliveryAgentPrivate::handleMouseEvent(QMouseEvent*) () at /lib64/libQt6Quick.so.6
#50 0x00007ffff216a5f8 in QQuickDeliveryAgent::event(QEvent*) () at /lib64/libQt6Quick.so.6
#51 0x00007ffff20ad234 in QQuickWindow::event(QEvent*) () at /lib64/libQt6Quick.so.6
#52 0x00007ffff77c1aae in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQt6Widgets.so.6
#53 0x00007ffff5f87498 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () at /lib64/libQt6Core.so.6
#54 0x00007ffff67e83db in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () at /lib64/libQt6Gui.so.6
#55 0x00007ffff684954c in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt6Gui.so.6
#56 0x00007ffff6c059f0 in  () at /lib64/libQt6Gui.so.6
#57 0x00007ffff5293f30 in  () at /lib64/libglib-2.0.so.0
#58 0x00007ffff5295b58 in  () at /lib64/libglib-2.0.so.0
#59 0x00007ffff529620c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#60 0x00007ffff61a330c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt6Core.so.6
#61 0x00007ffff5f91cbb in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQt6Core.so.6
#62 0x00007ffff5f8b8e6 in QCoreApplication::exec() () at /lib64/libQt6Core.so.6
#63 0x000055555555feeb in  ()
#64 0x00007ffff562a1f0 in __libc_start_call_main () at /lib64/libc.so.6
#65 0x00007ffff562a2b9 in __libc_start_main_impl () at /lib64/libc.so.6
#66 0x0000555555560825 in  ()
(gdb) exit
A debugging session is active.

        Inferior 1 [process 15470] will be killed.

Quit anyway? (y or n) y

sudo zypper install plasma6-systemmonitor-debuginfo-6.0.2-1.1.x86_64

[sudo] password for root: 
Retrieving repository 'Main Repository (NON-OSS)' metadata ..............................................................................................................................................................................................................[done]
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Building repository 'openSUSE-20230920-0' cache .........................................................................................................................................................................................................................[done]
Loading repository data...
Reading installed packages...
'plasma6-systemmonitor-debuginfo-6.0.2-1.1.x86_64' not found in package names. Trying capabilities.
No provider of 'plasma6-systemmonitor-debuginfo-6.0.2-1.1.x86_64' found. ['--plus-content debug'?]
Resolving package dependencies...
Nothing to do.

Any idea why drkonqi doesn’t invoke, though?

Duha · March 18, 2024, 7:50pm

Good question, but I sadly have no Idea. Maybe someone with more knowledge can answer.

Angus · March 18, 2024, 9:42pm

pssst. It helps if you, erm, enable the repo you need.

rokejulianlockhart · March 19, 2024, 6:52pm

@Angus, can you elaborate? I don’t understand what you mean by that.

Angus · March 19, 2024, 7:16pm

zypper lr

(padding to 20 chrs)