https://bugs.kde.org/show_bug.cgi?id=428971

            Bug ID: 428971
           Summary: System Monitor may get stuck while it loads Processes
                    page
           Product: plasma-systemmonitor
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: ksysguard-b...@kde.org
          Reporter: vlad.zahorod...@kde.org
                CC: ahiems...@heimr.nl, plasma-b...@kde.org
  Target Milestone: ---

Created attachment 133229
  --> https://bugs.kde.org/attachment.cgi?id=133229&action=edit
system monitor after a couple of minutes

SUMMARY


STEPS TO REPRODUCE
1. Start System Monitor
2. Wait for the Overview page to load
3. Click "Processes" page in the sidebar and immediately click "History" page
4. Wait for the History page to get loaded
5. Click "Processes" page again

OBSERVED RESULT
System Monitor never loads Processes tab

EXPECTED RESULT
Processes page gets loaded

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

Terminal output:

```
QML debugging is enabled. Only use this in a safe environment.
QDBusConnection::connect: object path '/plasma-systemmonitorrc' is not valid
Cyclic dependency detected between
"file:///data/projects/usr/lib/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml"
and
"file:///data/projects/usr/lib/qml/org/kde/kirigami.2/styles/org.kde.desktop.plasma/Units.qml"
QCoreApplication::postEvent: Unexpected null receiver
file:///data/projects/usr/lib/qml/org/kde/newstuff/qml/QuestionAsker.qml:91:5:
QML Connections: Cannot assign to non-existent property "onClosing"
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:65:9:
QML RowLayout (parent or ancestor of QQuickLayoutAttached): Binding loop
detected for property "maximumWidth"
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:65:9:
QML RowLayout (parent or ancestor of QQuickLayoutAttached): Binding loop
detected for property "maximumWidth"
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/PageRowGlobalToolBarUI.qml:65:9:
QML RowLayout (parent or ancestor of QQuickLayoutAttached): Binding loop
detected for property "maximumWidth"
file:///data/projects/usr/lib/qml/QtQuick/Controls.2/org.kde.desktop/ScrollView.qml:102:27:
QML ScrollBar: Binding loop detected for property "visible"
org.kde.ksysguard.plugin.network: Helper process terminated abnormally!
org.kde.ksysguard.plugin.network: "The process doesn't have permission to open
the capture source\n"
file::/main.qml:123:17: Unable to assign [undefined] to QString
file::/main.qml:124:17: Unable to assign [undefined] to QString
file::/main.qml:123:17: Unable to assign [undefined] to QString
file::/main.qml:124:17: Unable to assign [undefined] to QString
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
qt.core.qabstractitemmodel.checkindex: Index
QModelIndex(-1,-1,0x0,QObject(0x0)) is not valid (expected valid)
file:///data/projects/usr/lib/qml/org/kde/ksysguard/table/TableViewHeader.qml:200:
TypeError: Cannot read property 'row' of undefined (exception occurred during
delayed function evaluation)
file:///data/projects/usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/LineChart.qml:77:9:
Unable to assign [undefined] to bool
file:///data/projects/usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/LineChart.qml:77:9:
Unable to assign [undefined] to bool
file:///data/projects/usr/share/ksysguard/sensorfaces/org.kde.ksysguard.linechart/contents/ui/LineChart.qml:77:9:
Unable to assign [undefined] to bool
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/ActionToolBar.qml:110:18:
QML ToolBarLayout: Binding loop detected for property "actions"
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/ActionToolBar.qml:110:18:
QML ToolBarLayout: Binding loop detected for property "actions"
org.kde.ksysguard.plugin.network: Helper process terminated abnormally!
org.kde.ksysguard.plugin.network: "The process doesn't have permission to open
the capture source\n"
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/Page.qml:399: TypeError:
Cannot read property 'currentIndex' of null
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/AbstractPageHeader.qml:29:
TypeError: Cannot read property 'ScenePosition' of null
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/AbstractPageHeader.qml:24:
TypeError: Cannot read property 'title' of null
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/ToolBarPageHeader.qml:48:13:
Unable to assign [undefined] to double
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/ToolBarPageHeader.qml:47:13:
Unable to assign [undefined] to double
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/ToolBarPageHeader.qml:46:13:
Unable to assign [undefined] to double
file:///data/projects/usr/lib/qml/org/kde/kirigami.2/private/globaltoolbar/ToolBarPageHeader.qml:45:13:
Unable to assign [undefined] to bool
```

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