https://bugs.kde.org/show_bug.cgi?id=467297
Bug ID: 467297
Summary: kwin_wayland crashes when adding sufficient many
(horizontally tiled) tiles
Classification: Plasma
Product: kwin
Version: 5.27.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Custom Tiling
Assignee: kwin-bugs-n...@kde.org
Reporter: pos...@posteo.eu
CC: notm...@gmail.com
Target Milestone: ---
STEPS TO REPRODUCE
1. Open the tiling editor (Meta + T)
2. Keep tiling horizontally (10-20 times)
3. Try to interact with those tiles
OBSERVED RESULT
The system freezes and finally kwin_wayland crashes and recovers itself. All
apps etc. are terminated however.
This issue can be reproduced always.
```
(gdb) bt full
#0 0x00007f2992088bc6 in QQuickItem::qt_static_metacall(QObject*,
QMetaObject::Call, int, void**) (_o=<optimized out>, _c=<optimized out>,
_id=<optimized out>, _a=<optimized out>) at .moc/moc_qquickitem.cpp:931
_t = <optimized out>
_v = 0x7f293cebfef0
#1 0x00007f2992089953 in QQuickItem::qt_metacall(QMetaObject::Call, int,
void**) (this=this@entry=0x55a0cdec2ba0, _c=_c@entry=QMetaObject::ReadProperty,
_id=12, _a=_a@entry=0x7fff94314230) at .moc/moc_qquickitem.cpp:1048
#2 0x00007f295a395045 in QQuickLayout::qt_metacall(QMetaObject::Call, int,
void**) (this=this@entry=0x55a0cdec2ba0, _c=_c@entry=QMetaObject::ReadProperty,
_id=<optimized out>, _a=_a@entry=0x7fff94314230) at
.moc/moc_qquicklayout_p.cpp:132
#3 0x00007f295a38de05 in QQuickGridLayoutBase::qt_metacall(QMetaObject::Call,
int, void**) (this=this@entry=0x55a0cdec2ba0,
_c=_c@entry=QMetaObject::ReadProperty, _id=<optimized out>,
_a=_a@entry=0x7fff94314230) at .moc/moc_qquicklinearlayout_p.cpp:158
#4 0x00007f295a38dea5 in QQuickGridLayout::qt_metacall(QMetaObject::Call, int,
void**) (this=0x55a0cdec2ba0, _c=QMetaObject::ReadProperty, _id=<optimized
out>, _a=0x7fff94314230) at .moc/moc_qquicklinearlayout_p.cpp:394
#5 0x00007f2991b05b34 in QV4::QmlListWrapper::create(QV4::ExecutionEngine*,
QObject*, int, int) (engine=0x55a0c7dce9e0, object=0x55a0cdec2ba0, propId=13,
propType=1324) at
/usr/src/debug/qtdeclarative-everywhere-src-5.15.8+kde22/src/qml/qml/qqmllistwrapper.cpp:80
scope = {engine = 0x55a0c7dce9e0, mark = 0x7f293d0276d8}
r = {ptr = 0x7f293d0276d8}
args = {0x7f293cebfef0, 0x0}
#6 0x00007f29919b8499 in loadProperty(QV4::ExecutionEngine*, QObject*,
QQmlPropertyData const&) (v4=0x55a0c7dce9e0, object=0x55a0cdec2ba0,
property=...) at
../../include/QtQml/5.15.8/QtQml/private/../../../../../../src/qml/qml/qqmlpropertydata_p.h:284
scope = {engine = 0x55a0c7dce9e0, mark = 0x7f293d0276d8}
#7 0x00007f2991995ff6 in
QV4::QObjectWrapper::lookupGetterImpl<QV4::QQmlContextWrapper::lookupScopeObjectProperty(QV4::Lookup*,
QV4::ExecutionEngine*, QV4::Value*)::<lambda()> >
(useOriginalProperty=true, revertLookup=..., object=<optimized out>,
engine=0x55a0c7dce9e0, lookup=0x55a0c7dad1a0) at
../../include/QtQml/5.15.8/QtQml/private/../../../../../../src/qml/jsruntime/qv4qobjectwrapper_p.h:262
o = <optimized out>
This = <optimized out>
qobj = <optimized out>
ddata = <optimized out>
property = <optimized out>
scope = {engine = 0x55a0c7dce9e0, mark = 0x7f293d0276c8}
qmlContext = {ptr = <optimized out>}
scopeObject = <optimized out>
revertLookup = {__l = <optimized out>, __engine = <optimized out>,
__base = <optimized out>}
obj = {ptr = <optimized out>}
#8 QV4::QQmlContextWrapper::lookupScopeObjectProperty(QV4::Lookup*,
QV4::ExecutionEngine*, QV4::Value*) (l=0x55a0c7dad1a0, engine=0x55a0c7dce9e0,
base=0x0) at
/usr/src/debug/qtdeclarative-everywhere-src-5.15.8+kde22/src/qml/jsruntime/qv4qmlcontext.cpp:562
scope = {engine = 0x55a0c7dce9e0, mark = 0x7f293d0276c8}
qmlContext = {ptr = <optimized out>}
scopeObject = <optimized out>
revertLookup = {__l = <optimized out>, __engine = <optimized out>,
__base = <optimized out>}
obj = {ptr = <optimized out>}
#9 0x00007f2946459a27 in ()
#10 0x0000000000000000 in ()
```
```
list
926 case 7: *reinterpret_cast< qreal*>(_v) = _t->width(); break;
927 case 8: *reinterpret_cast< qreal*>(_v) = _t->height(); break;
928 case 9: *reinterpret_cast< qreal*>(_v) = _t->opacity(); break;
929 case 10: *reinterpret_cast< bool*>(_v) = _t->isEnabled();
break;
930 case 11: *reinterpret_cast< bool*>(_v) = _t->isVisible();
break;
931 case 12: *reinterpret_cast< QQmlListProperty<QQuickItem>*>(_v)
= _t->QQuickItem::d_func()->visibleChildren(); break;
932 case 13: *reinterpret_cast< QQmlListProperty<QQuickState>*>(_v)
= _t->QQuickItem::d_func()->states(); break;
933 case 14: *reinterpret_cast<
QQmlListProperty<QQuickTransition>*>(_v) =
_t->QQuickItem::d_func()->transitions(); break;
934 case 15: *reinterpret_cast< QString*>(_v) = _t->state(); break;
935 case 16: *reinterpret_cast< QRectF*>(_v) = _t->childrenRect();
break;
```
EXPECTED RESULT
1. Cap the maximum number of tiles to some sane value :)
2. Don't crash
SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20230312
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Kernel Version: 6.2.2-1-default (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon RX 580 Series
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