Details
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Bug
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Resolution: Incomplete
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P1: Critical
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None
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6.4.3, 6.5.0
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None
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macOS,
Windows
Description
Problem
We're seeing a lot of crashes when updating Lists since switching to Qt6 (happens at least with Qt 6.4.3 and Qt 6.5.0). It mostly happens either if a the result set of a QSqlQuery model is updated, or if another QAbstractListModel is completely reset.
Most, but not all of the affected lists are backed by a derivative of QSqlQueryModel. For those, setting an empty query before setting another "real" query seems to help avoiding the problem, e. g.
model->setQuery(QSqlQuery{});
QSqlQuery newQuery{"some sql"};
model->setQuery(newQuery);
In the non QSqlQuery backed cases, it helped to set the ListView model in QML to null before updating the List also seems to avoid the crashes. The crashes look very similar to https://bugreports.qt.io/browse/QTBUG-34779, and the problems did not appear in Qt5 (or at least not this frequent).
Example Stack Trace
0 QtQuick 0x11525a272 QQuickItem::setParentItem(QQuickItem*) + 34 1 QtQuick 0x1154f042b 0x11520b000 + 3036203 2 QtQuick 0x1154fccc5 0x11520b000 + 3087557 3 QtQuick 0x1154ed699 0x11520b000 + 3024537 4 QtQuick 0x1154e752f 0x11520b000 + 2999599 5 QtQuick 0x1154ebd78 QQuickItemView::modelUpdated(QQmlChangeSet const&, bool) + 72 6 QtCore 0x11862534a 0x118567000 + 779082 7 QtQmlModels 0x114113a42 QQmlInstanceModel::modelUpdated(QQmlChangeSet const&, bool) + 66 8 QtQmlModels 0x1141549e6 0x1140fb000 + 367078 9 QtQmlModels 0x11414b9f1 0x1140fb000 + 330225 10 QtQmlModels 0x11414c67b QQmlDelegateModel::_q_itemsInserted(int, int) + 315 11 QtQmlModels 0x11415ec30 0x1140fb000 + 408624 12 QtQmlModels 0x11415f15d QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) + 141 13 QtCore 0x11862505e 0x118567000 + 778334 14 QtCore 0x1187f8b5c QAbstractItemModel::endInsertRows() + 220 15 QtSql 0x11361a06f 0x113600000 + 106607 16 QtQmlModels 0x114145732 0x1140fb000 + 304946 17 QtQmlModels 0x1141550f5 QQmlDelegateModel::_q_modelReset() + 565 18 QtQmlModels 0x11415f15d QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) + 141 19 QtCore 0x11862505e 0x118567000 + 778334 20 QtCore 0x1187fa4f7 QAbstractItemModel::endResetModel() + 87 21 QtSql 0x11361b446 QSqlQueryModel::setQuery(QSqlQuery&&) + 1254 22 pascom Client 0x102edfd35 0x1029a8000 + 5471541 23 QtCore 0x118625085 0x118567000 + 778373 24 QtCore 0x118625085 0x118567000 + 778373 25 QtCore 0x11863ae5a QTimer::timerEvent(QTimerEvent*) + 202
Attachments
Issue Links
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