https://bugs.kde.org/show_bug.cgi?id=480504
Bug ID: 480504
Summary: NeoChat frequently freezes until killed somewhere in
Harfbuzz code while scrolling in the message view
Classification: Applications
Product: NeoChat
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Keywords: qt6, regression
Severity: major
Priority: NOR
Component: General
Assignee: fe...@posteo.de
Reporter: n...@kde.org
CC: c...@carlschwan.eu
Target Milestone: ---
Everything from git master with Plasma 6 Wayland on top of Fedora 39.
This has happened three times today: when I scroll in the message view, the app
will simply freeze forever until force-quit.
Here's the backtrace gathered using `gdb attach $(pidof neochat):
#0 0x00007f5f64f034a8 in _hb_glyph_info_set_unicode_props (info=0x7871f10,
buffer=0x6d89600)
at /usr/src/debug/harfbuzz-8.2.1-2.fc39.x86_64/src/hb-ot-layout.hh:206
#1 0x00007f5f64f0a55a in hb_set_unicode_props (buffer=<optimized out>)
at /usr/src/debug/harfbuzz-8.2.1-2.fc39.x86_64/src/hb-ot-shape.cc:477
#2 hb_ot_shape_internal (c=0x7ffcb0753a90)
at /usr/src/debug/harfbuzz-8.2.1-2.fc39.x86_64/src/hb-ot-shape.cc:1194
#3 0x00007f5f64f13933 in _hb_ot_shape
(num_features=1, features=0x7ffcb0753d98, buffer=0x6d89600, font=0x2d8af60,
shape_plan=0x2da6f80)
at /usr/src/debug/harfbuzz-8.2.1-2.fc39.x86_64/src/hb-ot-shape.cc:1230
#4 _hb_shape_plan_execute_internal
(num_features=1, features=0x7ffcb0753d98, buffer=0x6d89600, font=0x2d8af60,
shape_plan=0x2da6f80)
at /usr/src/debug/harfbuzz-8.2.1-2.fc39.x86_64/src/hb-shaper-list.hh:47
#5 hb_shape_plan_execute
(shape_plan=shape_plan@entry=0x2da6f80, font=font@entry=0x2d8af60,
buffer=buffer@entry=0x6d89600, features=features@entry=0x7ffcb0753d98,
num_features=num_features@entry=1)
at /usr/src/debug/harfbuzz-8.2.1-2.fc39.x86_64/src/hb-shape-plan.cc:452
#6 0x00007f5f64f1760c in hb_shape_full
(font=0x2d8af60, buffer=0x6d89600, features=0x7ffcb0753d98, num_features=1,
shaper_list=<optimized out>) at
/usr/src/debug/harfbuzz-8.2.1-2.fc39.x86_64/src/hb-shape.cc:148
#7 0x00007f5f68f222af in QTextEngine::shapeTextWithHarfbuzzNG
(this=this@entry=0x6f5c640, si=..., string=string@entry=0x710a100,
itemLength=itemLength@entry=36, fontEngine=fontEngine@entry=0x2aab290,
itemBoundaries=..., kerningEnabled=true, hasLetterSpacing=false,
fontFeatures=...)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextengine.cpp:1689
#8 0x00007f5f68f23dd4 in QTextEngine::shapeText (this=<optimized out>,
item=<optimized out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextengine.cpp:1488
#9 0x00007f5f68f25db8 in QTextEngine::shape (this=<optimized out>,
item=<optimized out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextengine.cpp:1874
#10 0x00007f5f68f55b17 in QTextLine::layout_helper
(this=0x7ffcb07542e0, maxGlyphs=maxGlyphs@entry=2147483647)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextlayout.cpp:1880
#11 0x00007f5f68f56c9a in QTextLine::setLineWidth (this=<optimized out>,
width=<optimized out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextlayout.cpp:1629
#12 0x00007f5f68f097d5 in QTextDocumentLayoutPrivate::layoutBlock
(this=this@entry=0x9e38720, bl=..., blockPosition=blockPosition@entry=0,
blockFormat=..., layoutStruct=layoutStruct@entry=0x7ffcb07545f0,
layoutFrom=layoutFrom@entry=0, layoutTo=2147483647, previousBlockFormat=0x0)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/redhat-linux-build/include/QtGui/6.6.0/QtGui/private/../../../../../../src/gui/painting/qfixed_p.h:28
#13 0x00007f5f68f115ea in QTextDocumentLayoutPrivate::layoutFlow
(this=this@entry=0x9e38720, it=...,
layoutStruct=layoutStruct@entry=0x7ffcb07545f0, layoutFrom=layoutFrom@entry=0,
layoutTo=layoutTo@entry=2147483647, width=..., width@entry=...)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextdocumentlayout.cpp:3279
#14 0x00007f5f68f0fa11 in QTextDocumentLayoutPrivate::layoutFrame
(this=this@entry=0x9e38720, f=f@entry=0x79c5d10,
layoutFrom=layoutFrom@entry=0, layoutTo=layoutTo@entry=2147483647,
frameWidth=..., frameWidth@entry=..., frameHeight=..., parentY=...)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/redhat-linux-build/include/QtGui/6.6.0/QtGui/private/../../../../../../src/gui/painting/qfixed_p.h:31
#15 0x00007f5f68f100f2 in QTextDocumentLayoutPrivate::layoutFrame
(this=this@entry=0x9e38720, f=f@entry=0x79c5d10,
layoutFrom=layoutFrom@entry=0, layoutTo=layoutTo@entry=2147483647, parentY=...,
parentY@entry=...)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextdocumentlayout.cpp:2910
#16 0x00007f5f68f1583b in QTextDocumentLayout::doLayout
(this=0x6d4af20, from=0, oldLength=oldLength@entry=0, length=2147483647)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/redhat-linux-build/include/QtGui/6.6.0/QtGui/private/../../../../../../src/gui/painting/qfixed_p.h:31
#17 0x00007f5f68f172aa in QTextDocumentLayoutPrivate::ensureLayoutedByPosition
(position=<optimized out>, this=<optimized out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextdocumentlayout.cpp:477
#18 QTextDocumentLayoutPrivate::ensureLayoutedByPosition (position=1000,
this=0x9e38720)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextdocumentlayout.cpp:3987
#19 QTextDocumentLayoutPrivate::layoutStep (this=0x9e38720)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextdocumentlayout.cpp:4001
#20 QTextDocumentLayout::documentChanged
(this=0x6d4af20, from=<optimized out>, oldLength=0, length=37)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextdocumentlayout.cpp:3789
#21 0x00007f5f68ed3bc4 in QTextDocument::setTextWidth (this=<optimized out>,
width=width@entry=141)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/text/qtextdocument.cpp:716
#22 0x00007f5f6b6ad3b1 in QQuickTextEdit::updateSize
(this=this@entry=0x7372ff0)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquicktextedit.cpp:2707
#23 0x00007f5f6b6b0d44 in QQuickTextEdit::geometryChange
(this=0x7372ff0, newGeometry=..., oldGeometry=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquicktextedit.cpp:1495
#24 0x00007f5f6b630e9a in QQuickItem::setSize (this=0x7372ff0, size=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:7564
#25 0x00007f5f45904d4a in QQuickGridLayoutItem::setGeometry (this=0x6093d10,
rect=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquickgridlayoutengine_p.h:85
#26 0x00007f5f68f7a36c in QGridLayoutEngine::setGeometries
(this=this@entry=0x2b74368, contentsGeometry=..., styleInfo=<optimized
out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/util/qgridlayoutengine.cpp:1052
#27 0x00007f5f45901d00 in QQuickGridLayoutBase::rearrange (this=0x2d7a3e0,
size=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquicklinearlayout.cpp:479
#28 0x00007f5f458fe8b9 in QQuickLayout::geometryChange
(oldGeometry=..., newGeometry=..., this=0x2d7a3e0)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquicklayout.cpp:932
#29 QQuickLayout::geometryChange (this=0x2d7a3e0, newGeometry=...,
oldGeometry=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquicklayout.cpp:924
#30 0x00007f5f6b630e9a in QQuickItem::setSize (this=0x2d7a3e0, size=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:7564
#31 0x00007f5f6b5f8e92 in QQuickAnchorsPrivate::setItemSize (v=...,
this=0x70d6c90)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickanchors.cpp:391
#32 QQuickAnchorsPrivate::fillChanged (this=0x70d6c90)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickanchors.cpp:167
#33 0x00007f5f6b638d76 in operator() (listener=..., __closure=<optimized out>)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:3824
#34 QQuickItemPrivate::notifyChangeListeners<QQuickItem::geometryChange(const
QRectF&, const QRectF&)::<lambda(const QQuickItemPrivate::ChangeListener&)> >
(function=<optimized out>, changeTypes=..., this=0x6e38220)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/redhat-linux-build/include/QtQuick/6.6.0/QtQuick/private/../../../../../../src/quick/items/qquickitem_p.h:357
#35 QQuickItem::geometryChange (this=0x65c09e0, newGeometry=<optimized out>,
oldGeometry=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:3822
#36 0x00007f5f6b630e9a in QQuickItem::setSize (this=0x65c09e0, size=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:7564
#37 0x00007f5f45904d4a in QQuickGridLayoutItem::setGeometry (this=0x8b2dcf0,
rect=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquickgridlayoutengine_p.h:85
#38 0x00007f5f68f7a36c in QGridLayoutEngine::setGeometries
(this=this@entry=0x74a2e78, contentsGeometry=..., styleInfo=<optimized
out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/util/qgridlayoutengine.cpp:1052
#39 0x00007f5f45901d00 in QQuickGridLayoutBase::rearrange (this=0x2b2bfe0,
size=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquicklinearlayout.cpp:479
#40 0x00007f5f458fe8b9 in QQuickLayout::geometryChange
(oldGeometry=..., newGeometry=..., this=0x2b2bfe0)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquicklayout.cpp:932
#41 QQuickLayout::geometryChange (this=0x2b2bfe0, newGeometry=...,
oldGeometry=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquicklayout.cpp:924
#42 0x00007f5f6b630e9a in QQuickItem::setSize (this=this@entry=0x2b2bfe0,
size=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:7564
#43 0x00007f5f65913aa5 in QQuickControlPrivate::resizeContent (this=<optimized
out>)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicktemplates/qquickcontrol.cpp:383
#44 0x00007f5f65917e39 in QQuickControl::geometryChange
(this=0x75359e0, newGeometry=..., oldGeometry=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicktemplates/qquickcontrol.cpp:2119
#45 0x00007f5f6b62f258 in QQuickItem::setImplicitWidth (this=0x75359e0,
w=<optimized out>)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:7327
#46 0x00007f5f6af13243 in QQmlPropertyData::writeProperty
(this=<optimized out>, target=<optimized out>, value=<optimized out>,
flags=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/redhat-linux-build/include/QtQml/6.6.0/QtQml/private/../../../../../../src/qml/qml/qqmlpropertydata_p.h:298
#47 0x00007f5f6af119d5 in GenericBinding<6>::write
(this=0x9fc32c0, result=0x7ffcb0755530, type=..., isUndefined=<optimized
out>, flags=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/qml/qml/qqmlbinding.cpp:210
#48 0x00007f5f6af0db22 in QQmlBinding::doUpdate
(this=0x9fc32c0, watcher=..., flags=..., scope=<optimized out>)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/qml/qml/qqmlbinding.cpp:690
#49 0x00007f5f6af0f968 in QQmlBinding::update (this=0x9fc32c0, flags=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/qml/qml/qqmlbinding.cpp:164
#50 0x00007f5f6afc72fc in QQmlNotifier::emitNotify (endpoint=<optimized out>,
a=0x0)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/qml/qml/qqmlnotifier.cpp:70
#51 0x00007f5f68401c80 in doActivate<false> (sender=0x75359e0, signal_index=54,
argv=0x0)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qobject.cpp:3913
#52 0x00007f5f6b63072a in QQuickItemPrivate::notifyChangeListeners<void
(QQuickItemChangeListener::*)(QQuickItem*), QQuickItem* const&>
(function=<optimized out>, changeTypes=..., this=0x74a2cf0)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/redhat-linux-build/include/QtQuick/6.6.0/QtQuick/private/../../../../../../src/quick/items/qquickitem_p.h:355
#53 QQuickItemPrivate::implicitWidthChanged (this=0x74a2cf0)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:7198
#54 QQuickItem::setImplicitSize (this=0x2b2bfe0, w=141, h=36)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickitem.cpp:7476
#55 0x00007f5f458fcc1a in QQuickLayoutPrivate::applySizeHints
(this=this@entry=0x74a2cf0)
at /usr/include/qt6/QtCore/qsize.h:322
#56 0x00007f5f458fcdf8 in QQuickLayout::ensureLayoutItemsUpdated
(this=this@entry=0x2b2bfe0, options=..., options@entry=...)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquicklayout.cpp:897
#57 0x00007f5f458fcfb7 in QQuickLayout::updatePolish (this=0x2b2bfe0)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quicklayouts/qquicklayout.cpp:798
#58 0x00007f5f6b6e75fd in QQuickWindowPrivate::polishItems (this=0x2a64140)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickwindow.cpp:346
#59 0x00007f5f6b8c51b3 in QSGThreadedRenderLoop::polishAndSync
(this=0x2a51ca0, w=0x3047370, inExpose=false)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/scenegraph/qsgthreadedrenderloop.cpp:1588
#60 0x00007f5f6b6e9db4 in QQuickWindow::event (this=<optimized out>,
event=<optimized out>)
at
/usr/src/debug/qt6-qtdeclarative-6.6.0-1.fc39.x86_64/src/quick/items/qquickwindow.cpp:1541
#61 0x00007f5f695c2b38 in QApplicationPrivate::notify_helper
(this=<optimized out>, receiver=0x2a64040, e=0x7ffcb0757840)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/widgets/kernel/qapplication.cpp:3290
#62 0x00007f5f683a0ba8 in QCoreApplication::notifyInternal2
(receiver=0x2a64040, event=0x7ffcb0757840)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qcoreapplication.cpp:1118
#63 0x00007f5f683a0dad in QCoreApplication::sendEvent
(receiver=<optimized out>, event=<optimized out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qcoreapplication.cpp:1536
#64 0x00007f5f68c48bc1 in QPlatformWindow::deliverUpdateRequest
(this=<optimized out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/kernel/qplatformwindow.cpp:783
#65 0x00007f5f683f3617 in QObject::event (this=0x2f58cc0, e=0x7f5f4c0062f0)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qobject.cpp:1437
#66 0x00007f5f695c2b38 in QApplicationPrivate::notify_helper
(this=<optimized out>, receiver=0x2f58cc0, e=0x7f5f4c0062f0)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/widgets/kernel/qapplication.cpp:3290
#67 0x00007f5f683a0ba8 in QCoreApplication::notifyInternal2
(receiver=0x2f58cc0, event=0x7f5f4c0062f0)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qcoreapplication.cpp:1118
#68 0x00007f5f683a0dad in QCoreApplication::sendEvent
(receiver=<optimized out>, event=<optimized out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qcoreapplication.cpp:1536
#69 0x00007f5f683a4aa5 in QCoreApplicationPrivate::sendPostedEvents
(receiver=0x0, event_type=0, data=0x2720260)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qcoreapplication.cpp:1898
#70 0x00007f5f683a4e1d in QCoreApplication::sendPostedEvents
(receiver=<optimized out>, event_type=<optimized out>)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qcoreapplication.cpp:1757
#71 0x00007f5f686410bf in postEventSourceDispatch (s=0x285a6a0)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qeventdispatcher_glib.cpp:243
#72 0x00007f5f67b2fe5c in g_main_dispatch (context=0x7f5f50000ef0) at
../glib/gmain.c:3476
#73 g_main_context_dispatch_unlocked (context=0x7f5f50000ef0) at
../glib/gmain.c:4284
#74 0x00007f5f67b8af18 in g_main_context_iterate_unlocked.isra.0
(context=context@entry=0x7f5f50000ef0, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4349
#75 0x00007f5f67b2dad3 in g_main_context_iteration (context=0x7f5f50000ef0,
may_block=1)
at ../glib/gmain.c:4414
#76 0x00007f5f6864096f in QEventDispatcherGlib::processEvents (this=0x27ef620,
flags=...)
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/kernel/qeventdispatcher_glib.cpp:393
#77 0x00007f5f683ad9bb in QEventLoop::exec (this=this@entry=0x7ffcb0757cf0,
flags=...,
flags@entry=...) at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/global/qflags.h:34
#78 0x00007f5f683a97bd in QCoreApplication::exec ()
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/corelib/global/qflags.h:74
#79 0x00007f5f68bf8b4d in QGuiApplication::exec ()
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/gui/kernel/qguiapplication.cpp:1921
#80 0x00007f5f695c2aa9 in QApplication::exec ()
at
/usr/src/debug/qt6-qtbase-6.6.0-6.fc39.x86_64/src/widgets/kernel/qapplication.cpp:2569
#81 0x0000000000435d09 in main (argc=<optimized out>, argv=<optimized out>)
at /home/nate/kde/src/neochat/src/main.cpp:272
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