Comment # 10 on bug 1072025 from Joachim Mairb�ck

When I start Yast as root (i.e. as normal via kdesu), I also get this crash,
but not when I start it as normal user.

The workaround with --gtk works because the fallback to Qt uses the built-in
menu, not y2controlcenter (but that's a different bug ...).

When running y2controlcenter directly (as root) under gdb, I get the following
backtrace:

#0  0x000000000042f8dc in QString::QString (other=..., this=0x7fffffffd2f0) at
/usr/include/qt5/QtCore/qstring.h:890
#1  0x000000000042f8dc in YQDesktopFilesModel::propertyValue(QModelIndex
const&, QString const&) const (this=this@entry=0x765c30, index=..., key=...)
    at
/usr/src/debug/yast2-control-center-3.1.6/src/yqdesktopfilesmodel.cpp:227
#2  0x0000000000430b94 in YQDesktopFilesModel::data(QModelIndex const&, int)
const (this=this@entry=0x765c30, index=..., role=<optimized out>)
    at
/usr/src/debug/yast2-control-center-3.1.6/src/yqdesktopfilesmodel.cpp:337
#3  0x000000000043b607 in YQModuleGroupsModel::data(QModelIndex const&, int)
const (this=0x765c30, index=..., role=<optimized out>)
    at
/usr/src/debug/yast2-control-center-3.1.6/src/yqmodulegroupsmodel.cpp:170
#4  0x0000000000443faa in YQModulesModel::data(QModelIndex const&, int) const
(this=0x735c00, index=..., role=<optimized out>)
    at /usr/src/debug/yast2-control-center-3.1.6/src/yqmodulesmodel.cpp:186
#5  0x000000000042a96d in
KCategorizedSortFilterProxyModel::compareCategories(QModelIndex const&,
QModelIndex const&) const (this=0x7b98d0, left=..., right=...)
    at
/usr/src/debug/yast2-control-center-3.1.6/src/kcategorizedsortfilterproxymodel.cpp:252
#6  0x000000000042a0b9 in
KCategorizedSortFilterProxyModel::lessThan(QModelIndex const&, QModelIndex
const&) const (this=0x7b98d0, left=..., right=...)
    at
/usr/src/debug/yast2-control-center-3.1.6/src/kcategorizedsortfilterproxymodel.cpp:224
#7  0x00007ffff69a0734 in QSortFilterProxyModelLessThan::operator()(int, int)
const (r2=10, r1=<optimized out>, this=0x7fffffffd760) at
itemmodels/qsortfilterproxymodel.cpp:74
#8  0x00007ffff69a0734 in std::__insertion_sort<int*,
QSortFilterProxyModelLessThan>(int*, int*, QSortFilterProxyModelLessThan)
(__first=__first@entry=0x7dc084, __last=__last@entry=0x7dc0a0, __comp=...) at
/usr/include/c++/4.8/bits/stl_algo.h:2159
#9  0x00007ffff69a14e8 in std::__chunk_insertion_sort<int*, long,
QSortFilterProxyModelLessThan> (__comp=..., __chunk_size=7, __last=0x7dc10c,
__first=0x7dc084)
    at /usr/include/c++/4.8/bits/stl_algo.h:3369
#10 0x00007ffff69a14e8 in std::__merge_sort_with_buffer<int*, int*,
QSortFilterProxyModelLessThan>(int*, int*, int*, QSortFilterProxyModelLessThan)
(__first=__first@entry=0x7dc068, __last=__last@entry=0x7dc10c,
__buffer=__buffer@entry=0x7dc9b0, __comp=...) at
/usr/include/c++/4.8/bits/stl_algo.h:3414
#11 0x00007ffff69a5be2 in std::__stable_sort_adaptive<int*, int*, long,
QSortFilterProxyModelLessThan>(int*, int*, int*, long,
QSortFilterProxyModelLessThan) (__first=__first@entry=0x7dc068,
__last=__last@entry=0x7dc1b0, __buffer=__buffer@entry=0x7dc9b0,
__buffer_size=__buffer_size@entry=82, __comp=...) at
/usr/include/c++/4.8/bits/stl_algo.h:3473
#12 0x00007ffff6998db5 in std::stable_sort<int*, QSortFilterProxyModelLessThan>
(__comp=..., __last=0x7dc1b0, __first=0x7dc068) at
/usr/include/c++/4.8/bits/stl_algo.h:5712
#13 0x00007ffff6998db5 in
QSortFilterProxyModelPrivate::sort_source_rows(QVector<int>&, QModelIndex
const&) const (this=this@entry=0x7d92f0, source_rows=..., source_parent=...)
    at itemmodels/qsortfilterproxymodel.cpp:486
#14 0x00007ffff699af25 in QSortFilterProxyModelPrivate::sort() (this=0x7d92f0)
at itemmodels/qsortfilterproxymodel.cpp:440
#15 0x000000000041a9bb in MainWindow::MainWindow(QFlags<Qt::WindowType>)
(this=0x7fffffffdc30, wflags=...) at
/usr/src/debug/yast2-control-center-3.1.6/src/main_window.cpp:138
#16 0x0000000000417d88 in main(int, char**) (argc=1, argv=<optimized out>) at
/usr/src/debug/yast2-control-center-3.1.6/src/main.cpp:82

The crash occurs in QString's copy constructor, called from
YQDesktopFilesModel::propertyValue.