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Type: Bug
Resolution: Fixed
Priority: P1: Critical
Fix Version/s: None
Affects Version/s: 5.15.5
Component/s: Quick: Controls 2
Labels:
None

Platform/s:

Linux/X11

Description

Something during destruction of a delegate with a ScrollView causes "Segmentation fault."

Here's a formatted stacktrace from gdb, along with some "print" commands attached.

It happens a bit randomly when filtering a list through a proxy model. The delegate in this case is quite complex, and contains a QtQuick.Controls.2/Checkbox; and our implementation of CheckBox's QQC2 style uses a scrollable listview in its dropdown/popup.

I have most KDE packages built from git master (frameworks+workspace+desktop). The bug appears when testing this patch: https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/1827/diffs?diff_id=390994, with this command: $ gdb --args plasmoidviewer -a org.kde.plasma.systemtray.

See also: https://bugreports.qt.io/browse/QTBUG-82285

Here are N top lines of a traceback from the attachment, to make this bug report searchable:

#0  QVector<QQuickItemPrivate::ChangeListener>::indexOf(QQuickItemPrivate::ChangeListener const&, int) const [clone .constprop.0] [clone .isra.0] (t=..., from=0, this=<optimized out>) at /usr/include/qt/QtCore/qvector.h:1002
#1  0x00007ffff7a91414 in QVector<QQuickItemPrivate::ChangeListener>::removeOne(QQuickItemPrivate::ChangeListener const&) (t=..., this=<optimized out>) at /usr/include/qt/QtCore/qvector.h:180
#2  QQuickItemPrivate::removeItemChangeListener(QQuickItemChangeListener*, QFlags<QQuickItemPrivate::ChangeType>) (this=0x555558a1b360, listener=<optimized out>, types=...) at /usr/src/debug/qtdeclarative/src/quick/items/qquickitem.cpp:3924
#3  0x00007fffef62e05c in QQuickScrollBarAttachedPrivate::setFlickable(QQuickFlickable*) (this=this@entry=0x55555897cac0, item=item@entry=0x0) at /usr/src/debug/qtquickcontrols2/src/quicktemplates2/qquickscrollbar.cpp:766
#4  0x00007fffef62e303 in QQuickScrollBarAttached::~QQuickScrollBarAttached() (this=0x555558e41140, this=<optimized out>) at /usr/src/debug/qtquickcontrols2/src/quicktemplates2/qquickscrollbar.cpp:1017
#5  0x00007fffef62e32e in QQuickScrollBarAttached::~QQuickScrollBarAttached() (this=0x555558e41140, this=<optimized out>) at /usr/src/debug/qtquickcontrols2/src/quicktemplates2/qquickscrollbar.cpp:1018
#6  0x00007ffff59052e5 in QObjectPrivate::deleteChildren() (this=this@entry=0x555558a7d8e0) at kernel/qobject.cpp:2104
#7  0x00007ffff5905a79 in QObject::~QObject() (this=0x555558aaa130, this=<optimized out>) at kernel/qobject.cpp:1082
#8  0x00007fffe4c1e1a3 in QQuickScrollView::~QQuickScrollView() (this=0x555558aaa130, this=<optimized out>) at ../../../include/QtQuickTemplates2/5.15.5/QtQuickTemplates2/private/../../../../../../qtquickcontrols2/src/quicktemplates2/qquickscrollview_p.h:58
#9  QQmlPrivate::QQmlElement<QQuickScrollView>::~QQmlElement() (this=0x555558aaa130, this=<optimized out>) at /usr/include/qt/QtQml/qqmlprivate.h:144
#10 QQmlPrivate::QQmlElement<QQuickScrollView>::~QQmlElement() (this=0x555558aaa130, this=<optimized out>) at /usr/include/qt/QtQml/qqmlprivate.h:144
#11 0x00007ffff76477c6 in QQmlObjectCreator::clear() (this=<optimized out>) at /usr/src/debug/qtdeclarative/src/qml/qml/qqmlobjectcreator.cpp:1461
#12 QQmlObjectCreator::clear() (this=0x555559223cb0) at /usr/src/debug/qtdeclarative/src/qml/qml/qqmlobjectcreator.cpp:1452
#13 0x00007ffff75eb0f1 in QQmlIncubatorPrivate::clear() (this=0x5555590b8180) at /usr/src/debug/qtdeclarative/src/qml/qml/qqmlincubator.cpp:174
#14 0x00007ffff75eadf0 in QQmlIncubator::clear() (this=this@entry=0x555558e5c690) at /usr/src/debug/qtdeclarative/src/qml/qml/qqmlincubator.cpp:606
#15 0x00007ffff7827ff9 in QQmlDelegateModelPrivate::releaseIncubator(QQDMIncubationTask*) (this=0x555558784410, incubationTask=0x555558e5c690) at /usr/src/debug/qtdeclarative/src/qmlmodels/qqmldelegatemodel.cpp:1074
#16 0x00007ffff782b679 in QQmlDelegateModelPrivate::itemsRemoved(QVector<QQmlListCompositor::Remove> const&, QVarLengthArray<QVector<QQmlChangeSet::Change>, 11>*, QHash<int, QList<QQmlDelegateModelItem*> >*) (this=this@entry=0x555558784410, removes=<optimized out>, translatedRemoves=translatedRemoves@entry=0x7fffffffb4b0, movedItems=movedItems@entry=0x0) at /usr/src/debug/qtdeclarative/src/qmlmodels/qqmldelegatemodel.cpp:1677
#17 0x00007ffff782bc0b in QQmlDelegateModelPrivate::itemsRemoved(QVector<QQmlListCompositor::Remove> const&) (this=this@entry=0x555558784410, removes=...) at /usr/src/debug/qtdeclarative/src/qmlmodels/qqmldelegatemodel.cpp:1714
#18 0x00007ffff782e2ac in QQmlDelegateModel::_q_itemsRemoved(int, int) (this=<optimized out>, index=9, count=5) at /usr/src/debug/qtdeclarative/src/qmlmodels/qqmldelegatemodel.cpp:1757
#19 0x00007ffff7836da3 in QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) (this=0x5555587843c0, _c=QMetaObject::InvokeMetaMethod, _id=14, _a=0x7fffffffb6d0) at .moc/moc_qqmldelegatemodel_p.cpp:371
#20 0x00007ffff590ef9d in doActivate<false>(QObject*, int, void**) (sender=0x555558784a90, signal_index=15, argv=0x7fffffffb6d0) at kernel/qobject.cpp:3912
#21 0x00007ffff5897f53 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) (this=this@entry=0x555558784a90, _t1=..., _t2=<optimized out>, _t3=<optimized out>, _t4=...) at .moc/moc_qabstractitemmodel.cpp:606
#22 0x00007ffff58980b7 in QAbstractItemModel::endRemoveRows() (this=0x555558784a90) at itemmodels/qabstractitemmodel.cpp:2835