Created attachment 168830 [details] First file Qt 6.7.0 KF6 from Git kdiff3 from Git (lldb) run Process 1098029 launched: '/usr/bin/kdiff3' (x86_64) org.kde.kdiff3: Loading A: "/home/fireburn/dmesg.axion" org.kde.kdiff3: Loading B: "/home/fireburn/dmesg.txt" org.kde.kdiff3: Diff: A <-> B org.kde.kdiff3: Linediff: A <-> B org.kde.kdiff3: Enter: calcDiff3LineListUsingAB org.kde.kdiff3: Leave: calcDiff3LineListUsingAB terminate called after throwing an instance of 'std::system_error' what(): converted signed value too small: negative overflow error Process 1098029 stopped * thread #1, name = 'kdiff3', stop reason = signal SIGABRT frame #0: 0x00007ffff62bf86c libc.so.6`___lldb_unnamed_symbol3697 + 268 libc.so.6`___lldb_unnamed_symbol3697: -> 0x7ffff62bf86c <+268>: movl %eax, %ebx 0x7ffff62bf86e <+270>: negl %ebx 0x7ffff62bf870 <+272>: cmpl $0xfffff000, %eax ; imm = 0xFFFFF000 0x7ffff62bf875 <+277>: movl $0x0, %eax (lldb) bt * thread #1, name = 'kdiff3', stop reason = signal SIGABRT * frame #0: 0x00007ffff62bf86c libc.so.6`___lldb_unnamed_symbol3697 + 268 frame #1: 0x00007ffff626be66 libc.so.6`raise + 22 frame #2: 0x00007ffff62538b7 libc.so.6`abort + 215 frame #3: 0x00007ffff58a4c7b libstdc++.so.6`___lldb_unnamed_symbol7333 + 98 frame #4: 0x00007ffff58b8eec libstdc++.so.6`___lldb_unnamed_symbol7788 + 12 frame #5: 0x00007ffff58b8f57 libstdc++.so.6`std::terminate() + 23 frame #6: 0x000055555560fabf kdiff3`__clang_call_terminate + 15 frame #7: 0x000055555567559f kdiff3`getBestFirstLine(LineRef, int, LineRef, int) [inlined] LineRef::operator=(this=<unavailable>, lineIn=<unavailable>) at LineRef.h:51:21 frame #8: 0x0000555555675581 kdiff3`getBestFirstLine(line=LineRef @ scalar, nofLines=1559, firstLine=LineRef @ scalar, visibleLines=14) at difftextwindow.cpp:0 frame #9: 0x00005555556756ab kdiff3`DiffTextWindow::setFastSelectorRange(this=0x000055555615a6c0, line1=<unavailable>, nofLines=<unavailable>) at difftextwindow.cpp:595:32 frame #10: 0x00007ffff60dda8f libQt6Core.so.6`___lldb_unnamed_symbol13786 + 1279 frame #11: 0x000055555560ccd1 kdiff3`MergeResultWindow::setFastSelectorRange(this=<unavailable>, _t1=LineRef @ 0x00007fffffffc46c, _t2=1559) at moc_mergeresultwindow.cpp:574:5 frame #12: 0x00005555556ad3f3 kdiff3`MergeResultWindow::setFastSelector(this=0x0000555555c804c0, i=std::__cxx11::list<MergeBlock, std::allocator<MergeBlock> >::iterator @ scalar) at mergeresultwindow.cpp:788:12 frame #13: 0x00005555556a63a2 kdiff3`MergeResultWindow::merge(bool, e_SrcSelector, bool, bool) [inlined] MergeResultWindow::go(this=0x0000555555c804c0, eDir=eUp, eEndPoint=eEnd) at mergeresultwindow.cpp:548:5 frame #14: 0x00005555556a6364 kdiff3`MergeResultWindow::merge(bool, e_SrcSelector, bool, bool) [inlined] MergeResultWindow::slotGoTop(this=0x0000555555c804c0) at mergeresultwindow.cpp:658:5 frame #15: 0x00005555556a6364 kdiff3`MergeResultWindow::merge(this=0x0000555555c804c0, bAutoSolve=<unavailable>, defaultSelector=<unavailable>, bConflictsOnly=false, bWhiteSpaceOnly=<unavailable>) at mergeresultwindow.cpp:397:5 frame #16: 0x00005555556a5d8c kdiff3`MergeResultWindow::init(this=0x0000555555c804c0, pLineDataA=<unavailable>, sizeA=LineRef @ 0x00007fffffffc5c8, pLineDataB=<unavailable>, sizeB=LineRef @ 0x00007fffffffc5cc, pLineDataC=<unavailable>, sizeC=LineRef @ 0x00007fffffffc620, pDiff3LineList=0x000055555597a388, pTotalDiffStatus=0x0000555555a9ac50, bAutoSolve=true) at mergeresultwindow.cpp:132:5 frame #17: 0x000055555565f1b0 kdiff3`KDiff3App::mainInit(this=0x0000555555979fe0, pTotalDiffStatus=<unavailable>, inFlags=<unavailable>) at pdiff.cpp:377:27 frame #18: 0x000055555563193c kdiff3`KDiff3App::completeInit(QString const&, QString const&, QString const&) [inlined] KDiff3App::doFileCompare(this=0x0000555555979fe0) at kdiff3.cpp:595:5 frame #19: 0x0000555555631908 kdiff3`KDiff3App::completeInit(this=0x0000555555979fe0, fn1=<unavailable>, fn2=<unavailable>, fn3=<unavailable>) at kdiff3.cpp:646:13 frame #20: 0x000055555561d3e0 kdiff3`KDiff3Shell::KDiff3Shell(this=0x0000555555a07850, fn1=0x00007fffffffcb68, fn2=0x00007fffffffcb50, fn3=0x00007fffffffcb38) at kdiff3_shell.cpp:39:15 frame #21: 0x000055555561c629 kdiff3`QtPrivate::QCallableObject<main::$_0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) [inlined] main::$_0::operator()(this=0x0000555555982d30) const at main.cpp:192:21 frame #22: 0x000055555561c587 kdiff3`QtPrivate::QCallableObject<main::$_0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) [inlined] QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, main::$_0>::call(f=0x0000555555982d30, arg=<unavailable>) at qobjectdefs_impl.h:137:13 frame #23: 0x000055555561c587 kdiff3`QtPrivate::QCallableObject<main::$_0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) [inlined] void QtPrivate::FunctorCallable<main::$_0>::call<QtPrivate::List<>, void>(f=0x0000555555982d30, (null)=<unavailable>, arg=<unavailable>) at qobjectdefs_impl.h:345:13 frame #24: 0x000055555561c587 kdiff3`QtPrivate::QCallableObject<main::$_0, QtPrivate::List<>, void>::impl(which=<unavailable>, this_=0x0000555555982d20, r=<unavailable>, a=<unavailable>, ret=<unavailable>) at qobjectdefs_impl.h:555:21 frame #25: 0x00007ffff6084f6c libQt6Core.so.6`QObject::event(QEvent*) + 636 frame #26: 0x00007ffff6714d47 libQt6Gui.so.6`QGuiApplication::event(QEvent*) + 711 frame #27: 0x00007ffff768d9a8 libQt6Widgets.so.6`QApplication::event(QEvent*) + 520 frame #28: 0x00007ffff769061e libQt6Widgets.so.6`QApplicationPrivate::notify_helper(QObject*, QEvent*) + 302 frame #29: 0x00007ffff76920ae libQt6Widgets.so.6`QApplication::notify(QObject*, QEvent*) + 494 frame #30: 0x00007ffff6133f57 libQt6Core.so.6`QCoreApplication::notifyInternal2(QObject*, QEvent*) + 183 frame #31: 0x00007ffff613572e libQt6Core.so.6`QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) + 526 frame #32: 0x00007ffff5ecb2d7 libQt6Core.so.6`___lldb_unnamed_symbol10036 + 23 frame #33: 0x00007ffff4fa7602 libglib-2.0.so.0`___lldb_unnamed_symbol2489 + 482 frame #34: 0x00007ffff5014588 libglib-2.0.so.0`___lldb_unnamed_symbol2747 + 600 frame #35: 0x00007ffff4fa68ac libglib-2.0.so.0`g_main_context_iteration + 44 frame #36: 0x00007ffff5eb61c4 libQt6Core.so.6`QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 100 frame #37: 0x00007ffff6134ba6 libQt6Core.so.6`QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 550 frame #38: 0x00007ffff61347e8 libQt6Core.so.6`QCoreApplication::exec() + 136 frame #39: 0x000055555561aa89 kdiff3`main(argc=3, argv=<unavailable>) at main.cpp:195:21 frame #40: 0x00007ffff6255306 libc.so.6`___lldb_unnamed_symbol3281 + 134 frame #41: 0x00007ffff62553b9 libc.so.6`__libc_start_main + 137 frame #42: 0x00005555556083e5 kdiff3`_start + 37 (lldb)
Created attachment 168831 [details] Second file
I've attached the two files which trigger the problem for me
I believe I may found the cause of this error getBestFirstLine is returning a negative line value. This situation does not happen with most files and would have been ignored by pre 1.9 kdiff3. That would break assumptions else where in kdiff3 causing unpredictable results. I a fix locally need to test it the make sure.
I've just retested master, it's all looking good now thanks That's everything now migrated to Qt6 and working on my system :D Thanks again
I spoke too soon, if you scoll those two files then close kdiff3 you get the following segfault: Process 560661 stopped * thread #1, name = 'kdiff3', stop reason = signal SIGSEGV: address not mapped to object (fault address: 0x88) frame #0: 0x00007ffff4606190 libQt6WaylandClient.so.6`QtWaylandClient::QWaylandShmBackingStore::resize(QSize const&) + 848 libQt6WaylandClient.so.6`QtWaylandClient::QWaylandShmBackingStore::resize: -> 0x7ffff4606190 <+848>: cmpb $0x0, 0x88(%rcx) 0x7ffff4606197 <+855>: je 0x7ffff46061f0 ; <+944> 0x7ffff4606199 <+857>: cmpq $0x0, 0x80(%rcx) 0x7ffff46061a1 <+865>: je 0x7ffff46061f0 ; <+944> (lldb) bt * thread #1, name = 'kdiff3', stop reason = signal SIGSEGV: address not mapped to object (fault address: 0x88) * frame #0: 0x00007ffff4606190 libQt6WaylandClient.so.6`QtWaylandClient::QWaylandShmBackingStore::resize(QSize const&) + 848 frame #1: 0x00007ffff4605ce2 libQt6WaylandClient.so.6`QtWaylandClient::QWaylandShmBackingStore::beginPaint(QRegion const&) + 82 frame #2: 0x00007ffff6790361 libQt6Gui.so.6`QBackingStore::beginPaint(QRegion const&) + 433 frame #3: 0x00007ffff76e4ee2 libQt6Widgets.so.6`QWidgetRepaintManager::paintAndFlush() + 4514 frame #4: 0x00007ffff76c90bc libQt6Widgets.so.6`QWidgetRepaintManager::sync() + 284 frame #5: 0x00007ffff76be70f libQt6Widgets.so.6`QWidget::event(QEvent*) + 2671 frame #6: 0x00007ffff7546412 libQt6Widgets.so.6`QMainWindow::event(QEvent*) + 962 frame #7: 0x00007ffff7ecdde2 libKF6XmlGui.so.6`KMainWindow::event(QEvent*) + 4530 frame #8: 0x00007ffff7f0f4fb libKF6XmlGui.so.6`KXmlGuiWindow::event(QEvent*) + 43 frame #9: 0x00007ffff769061e libQt6Widgets.so.6`QApplicationPrivate::notify_helper(QObject*, QEvent*) + 302 frame #10: 0x00007ffff76920ae libQt6Widgets.so.6`QApplication::notify(QObject*, QEvent*) + 494 frame #11: 0x00007ffff6133f57 libQt6Core.so.6`QCoreApplication::notifyInternal2(QObject*, QEvent*) + 183 frame #12: 0x00007ffff76e2b07 libQt6Widgets.so.6`QWidgetRepaintManager::sendUpdateRequest(QWidget*, QWidgetRepaintManager::UpdateTime) + 743 frame #13: 0x00007ffff77373b7 libQt6Widgets.so.6`void QWidgetRepaintManager::markDirty<QRect>(QRect const&, QWidget*, QWidgetRepaintManager::UpdateTime, QWidgetRepaintManager::BufferState) + 1447 frame #14: 0x00007ffff76de31b libQt6Widgets.so.6`QWidget::repaint() + 187 frame #15: 0x0000555555672e4b kdiff3`DiffTextWindowFrame::setFirstLine(this=0x000055555615b3f0, firstLine=<unavailable>) at difftextwindow.cpp:2036:21 frame #16: 0x00007ffff60dda8f libQt6Core.so.6`___lldb_unnamed_symbol13786 + 1279 frame #17: 0x0000555555609593 kdiff3`DiffTextWindow::firstLineChanged(this=<unavailable>, _t1=LineRef @ 0x00007fffffffc24c) at moc_difftextwindow.cpp:431:5 frame #18: 0x0000555555674606 kdiff3`DiffTextWindow::setFirstLine(this=0x000055555615dba0, firstLine=LineRef @ rbp) at difftextwindow.cpp:503:12 frame #19: 0x00007ffff60dda8f libQt6Core.so.6`___lldb_unnamed_symbol13786 + 1279 frame #20: 0x00007ffff75e838f libQt6Widgets.so.6`QAbstractSlider::setValue(int) + 319 frame #21: 0x00007ffff762537c libQt6Widgets.so.6`___lldb_unnamed_symbol22374 + 380 frame #22: 0x00007ffff758bc18 libQt6Widgets.so.6`QScrollBar::wheelEvent(QWheelEvent*) + 136 frame #23: 0x00007ffff76be5d4 libQt6Widgets.so.6`QWidget::event(QEvent*) + 2356 frame #24: 0x00007ffff758bb58 libQt6Widgets.so.6`QScrollBar::event(QEvent*) + 504 frame #25: 0x00007ffff769061e libQt6Widgets.so.6`QApplicationPrivate::notify_helper(QObject*, QEvent*) + 302 frame #26: 0x00007ffff76920ae libQt6Widgets.so.6`QApplication::notify(QObject*, QEvent*) + 494 frame #27: 0x00007ffff6133f57 libQt6Core.so.6`QCoreApplication::notifyInternal2(QObject*, QEvent*) + 183 frame #28: 0x00007ffff76be5d4 libQt6Widgets.so.6`QWidget::event(QEvent*) + 2356 frame #29: 0x00007ffff769061e libQt6Widgets.so.6`QApplicationPrivate::notify_helper(QObject*, QEvent*) + 302 frame #30: 0x00007ffff7693488 libQt6Widgets.so.6`QApplication::notify(QObject*, QEvent*) + 5576 frame #31: 0x00007ffff6133f57 libQt6Core.so.6`QCoreApplication::notifyInternal2(QObject*, QEvent*) + 183 frame #32: 0x00007ffff76e95b1 libQt6Widgets.so.6`___lldb_unnamed_symbol23787 + 929 frame #33: 0x00007ffff76e6c82 libQt6Widgets.so.6`___lldb_unnamed_symbol23778 + 338 frame #34: 0x00007ffff769061e libQt6Widgets.so.6`QApplicationPrivate::notify_helper(QObject*, QEvent*) + 302 frame #35: 0x00007ffff76920ae libQt6Widgets.so.6`QApplication::notify(QObject*, QEvent*) + 494 frame #36: 0x00007ffff6133f57 libQt6Core.so.6`QCoreApplication::notifyInternal2(QObject*, QEvent*) + 183 frame #37: 0x00007ffff671675d libQt6Gui.so.6`QGuiApplicationPrivate::processWheelEvent(QWindowSystemInterfacePrivate::WheelEvent*) + 541 frame #38: 0x00007ffff6778f1a libQt6Gui.so.6`QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 394 frame #39: 0x00007ffff6c5cbe1 libQt6Gui.so.6`___lldb_unnamed_symbol22472 + 17 frame #40: 0x00007ffff4fa7602 libglib-2.0.so.0`___lldb_unnamed_symbol2489 + 482 frame #41: 0x00007ffff5014588 libglib-2.0.so.0`___lldb_unnamed_symbol2747 + 600 frame #42: 0x00007ffff4fa68ac libglib-2.0.so.0`g_main_context_iteration + 44 frame #43: 0x00007ffff5eb61c4 libQt6Core.so.6`QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 100 frame #44: 0x00007ffff6134ba6 libQt6Core.so.6`QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 550 frame #45: 0x00007ffff61347e8 libQt6Core.so.6`QCoreApplication::exec() + 136 frame #46: 0x000055555561aae9 kdiff3`main(argc=3, argv=<unavailable>) at main.cpp:195:21 frame #47: 0x00007ffff6255306 libc.so.6`___lldb_unnamed_symbol3281 + 134 frame #48: 0x00007ffff62553b9 libc.so.6`__libc_start_main + 137 frame #49: 0x0000555555608445 kdiff3`_start + 37
May be related to wayland somehow. I do most tests under X11 which does not readily reproduce the scroll crash.
Scrolling is very slow, taking 30 seconds or so to go down the page, and using quite a lot of CPU too, is there a way to see what's causing it? This is probably all wayland related but it's the only app I've seen misbehave
Go head a file bug regarding the scroll delay on Wayland. I can confirm that it happens but don't have a solution at this time.