(gdb) bt
#0  0x0000003755031930 in QQmlData::isSignalConnected(QAbstractDeclarativeData*, QObject const*, int) (d=0x52, index=3) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/qml/qqmlengine.cpp:730
#1  0x0000003752cbdf3b in QMetaObject::activate(QObject*, int, int, void**) (signal_index=3, this=<optimized out>) at kernel/qobject_p.h:251
#2  0x0000003752cbdf3b in QMetaObject::activate(QObject*, int, int, void**) (sender=0x2f84180, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3592
#3  0x0000003752cbe157 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=<optimized out>, m=m@entry=0x375521ee80 <QQmlDelegateModelItem::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3582
#4  0x0000003755137c10 in QQmlDelegateModelItem::modelIndexChanged() (this=<optimized out>) at .moc/moc_qqmldelegatemodel_p_p.cpp:163
#5  0x0000003755113e5b in QQmlDelegateModel::_q_itemsRemoved(int, int) (idx=<optimized out>, this=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/types/qqmldelegatemodel_p_p.h:121
#6  0x0000003755113e5b in QQmlDelegateModel::_q_itemsRemoved(int, int) (this=<optimized out>, index=1, count=4) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/types/qqmldelegatemodel.cpp:1339
#7  0x0000003755114439 in QQmlDelegateModel::_q_rowsRemoved(QModelIndex const&, int, int) (this=<optimized out>, parent=..., begin=<optimized out>, end=<optimized out>)
    at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/types/qqmldelegatemodel.cpp:1496
#8  0x0000003755136355 in QQmlDelegateModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=_o@entry=0x2a32870, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=10, _a=_a@entry=0x7fffffffba90)
    at .moc/moc_qqmldelegatemodel_p.cpp:200
#9  0x0000003755136dff in QQmlDelegateModel::qt_metacall(QMetaObject::Call, int, void**) (this=0x2a32870, _c=QMetaObject::InvokeMetaMethod, _id=10, _a=0x7fffffffba90) at .moc/moc_qqmldelegatemodel_p.cpp:293
#10 0x0000003752cbdbe2 in QMetaObject::activate(QObject*, int, int, void**) (sender=sender@entry=0x29d01b0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7fffffffba90)
    at kernel/qobject.cpp:3731
#11 0x0000003752cbe157 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x29d01b0, m=m@entry=0x3752ecba80 <QAbstractItemModel::staticMetaObject>, local_signal_index=local_signal_index@entry=12, argv=argv@entry=0x7fffffffba90) at kernel/qobject.cpp:3582
#12 0x0000003752d39134 in QAbstractItemModel::rowsRemoved(QModelIndex const&, int, int, QAbstractItemModel::QPrivateSignal) (this=this@entry=0x29d01b0, _t1=..., _t2=1, _t3=4) at .moc/moc_qabstractitemmodel.cpp:442
#13 0x0000003752c37036 in QAbstractItemModel::endRemoveRows() (this=0x29d01b0) at itemmodels/qabstractitemmodel.cpp:2668
#14 0x0000003752c5acd5 in QSortFilterProxyModelPrivate::remove_source_items(QVector<int>&, QVector<int>&, QVector<int> const&, QModelIndex const&, Qt::Orientation, bool) (emit_signal=true, orient=Qt::Vertical, proxy_parent=..., proxy_end=<optimized out>, proxy_start=<optimized out>, proxy_to_source=..., source_to_proxy=..., this=0x29fec30) at itemmodels/qsortfilterproxymodel.cpp:587
#15 0x0000003752c5acd5 in QSortFilterProxyModelPrivate::remove_source_items(QVector<int>&, QVector<int>&, QVector<int> const&, QModelIndex const&, Qt::Orientation, bool) (this=this@entry=0x29fec30, source_to_proxy=..., proxy_to_source=..., source_items=..., source_parent=..., orient=orient@entry=Qt::Vertical, emit_signal=true) at itemmodels/qsortfilterproxymodel.cpp:557
#16 0x0000003752c60fb0 in QSortFilterProxyModelPrivate::filter_changed(QModelIndex const&) (orient=Qt::Vertical, source_parent=..., proxy_to_source=..., source_to_proxy=..., this=0x29fec30) at itemmodels/qsortfilterproxymodel.cpp:1124
#17 0x0000003752c60fb0 in QSortFilterProxyModelPrivate::filter_changed(QModelIndex const&) (this=this@entry=0x29fec30, source_parent=...) at itemmodels/qsortfilterproxymodel.cpp:1056
#18 0x0000003752c618ba in QSortFilterProxyModel::setFilterWildcard(QString const&) (this=<optimized out>, pattern=...) at itemmodels/qsortfilterproxymodel.cpp:2442
#19 0x0000003752c61bff in QSortFilterProxyModel::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=_o@entry=0x29d01b0, _id=_id@entry=1, _a=_a@entry=0x7fffffffbe70, _c=QMetaObject::InvokeMetaMethod)
    at .moc/moc_qsortfilterproxymodel.cpp:194
#20 0x0000003752c626b3 in QSortFilterProxyModel::qt_metacall(QMetaObject::Call, int, void**) (_a=0x7fffffffbe70, _id=1, _c=QMetaObject::InvokeMetaMethod, _o=0x29d01b0) at .moc/moc_qsortfilterproxymodel.cpp:247
#21 0x0000003752c626b3 in QSortFilterProxyModel::qt_metacall(QMetaObject::Call, int, void**) (this=this@entry=0x29d01b0, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=1, _a=_a@entry=0x7fffffffbe70) at .moc/moc_qsortfilterproxymodel.cpp:248
#22 0x00007fffd2706a07 in PrinterSortFilterModel::qt_metacall(QMetaObject::Call, int, void**) (this=0x29d01b0, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fffffffbe70)
    at /home/jgrulich/development/projects/print-manager/build/libkcups/moc_PrinterSortFilterModel.cpp:148
#23 0x000000375500953e in CallMethod(QObject*, int, int, int, int*, QV8Engine*, QV4::CallData*) (object=object@entry=0x29d01b0, index=<optimized out>, returnType=returnType@entry=43, argCount=<optimized out>, argTypes=<optimized out>, engine=engine@entry=0xe3f710, callArgs=0x7fffd2b2b070) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/jsruntime/qv4qobjectwrapper.cpp:1147
#24 0x000000375500c49c in CallPrecise(QObject*, QQmlPropertyData const&, QV8Engine*, QV4::CallData*) (object=object@entry=0x29d01b0, data=..., engine=engine@entry=0xe3f710, callArgs=callArgs@entry=0x7fffd2b2b070)
    at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/jsruntime/qv4qobjectwrapper.cpp:1399
#25 0x000000375500cb03 in QV4::QObjectMethod::callInternal(QV4::CallData*) (this=<optimized out>, callData=0x7fffd2b2b070) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/jsruntime/qv4qobjectwrapper.cpp:1884
#26 0x00000037550182d8 in QV4::Runtime::callProperty(QV4::ExecutionContext*, QV4::String*, QV4::CallData*) (d=0x7fffd2b2b070, this=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/jsruntime/qv4object_p.h:278
#27 0x00000037550182d8 in QV4::Runtime::callProperty(QV4::ExecutionContext*, QV4::String*, QV4::CallData*) (context=0x7fffffffc4d0, name=0x7fffd80e8bc0, callData=0x7fffd2b2b070)
    at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/jsruntime/qv4runtime.cpp:930
#28 0x00007fffd803f2b6 in  ()
#29 0x00007fffffffc4c0 in  ()
#30 0x00007fffffffc4b0 in  ()
#31 0x0003000000000003 in  ()
#32 0x0000000002ead020 in  ()
#33 0x00007ffff27ec900 in  ()
#34 0x00007fffffffc480 in  ()
#35 0x0000000000e3cbb0 in  ()
#36 0x0000000000e3cbb0 in  ()
#37 0x00007fffd8172000 in  ()
#38 0x0000003754fc8db6 in QV4::SimpleScriptFunction::call(QV4::Managed*, QV4::CallData*) (that=0x7fffd80edc00, callData=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/jsruntime/qv4functionobject.cpp:511
#39 0x00000037550b081f in QQmlJavaScriptExpression::evaluate(QQmlContextData*, QV4::ValueRef, QV4::CallData*, bool*) (d=0xe3fad0, this=<optimized out>) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/jsruntime/qv4object_p.h:278
#40 0x00000037550b081f in QQmlJavaScriptExpression::evaluate(QQmlContextData*, QV4::ValueRef, QV4::CallData*, bool*) (this=this@entry=0x29ded50, context=<optimized out>, function=..., 
    function@entry=..., callData=callData@entry=0x7fffd2b2b008, isUndefined=isUndefined@entry=0x0) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/qml/qqmljavascriptexpression.cpp:158
#41 0x00000037550549a6 in QQmlBoundSignalExpression::evaluate(void**) (this=<optimized out>, a=a@entry=0x0) at /usr/src/debug/qtdeclarative-opensource-src-5.4.0/src/qml/qml/qqmlboundsignal.cpp:281
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