8000 qt6 inconsistent crash when opening viewer with plain text file · Issue #2265 · doublecmd/doublecmd · GitHub
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xBZZZZ opened this issue Apr 12, 2025 · 0 comments
Open

qt6 inconsistent crash when opening viewer with plain text file #2265

xBZZZZ opened this issue Apr 12, 2025 · 0 comments
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xBZZZZ commented Apr 12, 2025 •
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qt6.9.0 (25986746947798e1a22d0830d3bcb11a55fcd3ae)
fpc3.3.1 (f672d4cccf83d80351f5353a80270b55b6d74eb4)
lazarus4.9.9 (2c40863c96f745f1a546f67663bfdd6602b8e2d7)
doublecmd1.2.0 alpha (0f43599f75d21722feff3c73df456fb12d5b79d0)
doublecmd sometimes crashes when I view (F3) plain text file (no syntax highlighting)
I see this in terminal when doublecmd crashes (qt custom debug build):
QBackingStore::endPaint() called with active painter; did you forget to destroy it or call QPainter::end() on it?
ASSERT: "s" in file /home/asd/s/qt/qtbase/src/gui/painting/qpaintengine_raster.cpp, line 587
I can only crash doublecmd in host, not qemu virtual machine.
    gdb backtrace of breakpoint at qbackingstore.cpp:178
    #0  QBackingStore::endPaint (this=0x2f224d0) at /home/asd/s/qt/qtbase/src/gui/painting/qbackingstore.cpp:178
#1  0x00007ffff6bee5ea in QWidgetRepaintManager::paintAndFlush (this=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidgetrepaintmanager.cpp:910
#2  0x00007ffff6becd5d in QWidgetRepaintManager::sync (this=0x2eeb7d0, exposedWidget=0x2f5a350, exposedRegion=...) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidgetrepaintmanager.cpp:632
#3  0x00007ffff6ba8c38 in QWidgetPrivate::syncBackingStore (this=0x2fb57a0, region=...) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:1780
#4  0x00007ffff6bfcc88 in QWidgetWindow::handleExposeEvent (this=0x2f1e930, event=0x7fffffffa560) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidgetwindow.cpp:1090
#5  0x00007ffff6bf943a in QWidgetWindow::event (this=0x2f1e930, event=0x7fffffffa560) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidgetwindow.cpp:339
#6  0x00007ffff6b26cf2 in QApplicationPrivate::notify_helper (this=0x19965d0, receiver=0x2f1e930, e=0x7fffffffa560) at /home/asd/s/qt/qtbase/src/widgets/kernel/qapplication.cpp:3301
#7  0x00007ffff6b26ad6 in QApplication::notify (this=0x19ad1f0, receiver=0x2f1e930, e=0x7fffffffa560) at /home/asd/s/qt/qtbase/src/widgets/kernel/qapplication.cpp:3251
#8  0x00007ffff4f682b0 in QCoreApplication::notifyInternal2 (receiver=0x2f1e930, event=0x7fffffffa560) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1106
#9  0x00007ffff4f68ecb in QCoreApplication::sendSpontaneousEvent (receiver=0x2f1e930, event=0x7fffffffa560) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1560
#10 0x00007ffff5c64ef5 in QGuiApplicationPrivate::processExposeEvent (e=0x3029030) at /home/asd/s/qt/qtbase/src/gui/kernel/qguiapplication.cpp:3487
#11 0x00007ffff5c5f72c in QGuiApplicationPrivate::processWindowSystemEvent (e=0x3029030) at /home/asd/s/qt/qtbase/src/gui/kernel/qguiapplication.cpp:2281
#12 0x00007ffff5d2907a in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at /home/asd/s/qt/qtbase/src/gui/kernel/qwindowsysteminterface.cpp:1113
#13 0x00007ffff178c36c in xcbSourceDispatch (source=0x1a0cca0) at /home/asd/s/qt/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:57
#14 0x00007ffff78a7638 in ??? () at /lib64/libglib-2.0.so.0
#15 0x00007ffff78a9398 in ??? () at /lib64/libglib-2.0.so.0
#16 0x00007ffff78a9bac in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#17 0x00007ffff5410136 in QEventDispatcherGlib::processEvents (this=0x1a09580, flags=...) at /home/asd/s/qt/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:399
#18 0x00007ffff178c5ca in QXcbGlibEventDispatcher::processEvents (this=0x1a09580, flags=...) at /home/asd/s/qt/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:96
#19 0x00007ffff4f6893b in QCoreApplication::processEvents (flags=...) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1341
#20 0x00007ffff7cea1c1 in QCoreApplication_processEvents (flags=1) at /home/asd/s/lazarus/lcl/interfaces/qt6/cbindings/src/qcoreapplication_c.cpp:107
#21 0x00000000008161a7 in Show (this=0x300ad10, AWidget=0x2eeace0) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtcaret.pas:397
#22 0x0000000000815786 in ShowCaret (Widget=0x2eeace0) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtcaret.pas:208
#23 0x00000000006f4d63 in ShowCaret (this=0x19af9c0, hWnd=49196256) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtwinapi.inc:6471
#24 0x000000000065188e in ShowCaret (hWnd=49196256) at /home/asd/s/lazarus/lcl/include/winapi.inc:1014
#25 0x0000000000ca869f in OutText (this=0x301fe20, x=4, y=0, sText=..., StartPos=0, DataLength=1) at /home/asd/s/doublecmd/components/viewer/viewercontrol.pas:2156
#26 0x0000000000ca75ef in WriteText (this=0x301fe20) at /home/asd/s/doublecmd/components/viewer/viewercontrol.pas:1833
#27 0x0000000000ca3b09 in Paint (this=0x301fe20) at /home/asd/s/doublecmd/components/viewer/viewercontrol.pas:708
#28 0x000000000072a096 in PaintWindow (this=0x301fe20, DC=140737018628528) at /home/asd/s/lazarus/lcl/include/customcontrol.inc:123
#29 0x000000000070f657 in PaintHandler (this=0x301fe20, TheMessage=...) at /home/asd/s/lazarus/lcl/include/wincontrol.inc:4925
#30 0x0000000000713fdd in WMPaint (this=0x301fe20, Msg=...) at /home/asd/s/lazarus/lcl/include/wincontrol.inc:6870
#31 0x0000000000729fc3 in WMPaint (this=0x301fe20, Message=...) at /home/asd/s/lazarus/lcl/include/customcontrol.inc:103
#32 0x0000000000441018 in Dispatch (this=0x301fe20, message=<error reading variable: Attempt to dereference a generic pointer.>) at /home/asd/s/fpc/rtl/inc/objpas.inc:768
#33 0x000000000071f0e3 in WndProc (this=0x301fe20, TheMessage=...) at /home/asd/s/lazarus/lcl/include/control.inc:2299
#34 0x0000000000710cbd in WndProc (this=0x301fe20, Message=...) at /home/asd/s/lazarus/lcl/include/wincontrol.inc:5474
#35 0x000000000081faad in SlotPaint (this=0x2efa1c0, Sender=0x2f29d20, Event=0x7fffffffb8f0) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtwidgets.pas:4355
#36 0x000000000081c491 in EventFilter (this=0x2efa1c0, Sender=0x2f29d20, Event=0x7fffffffb8f0) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtwidgets.pas:2826
#37 0x00000000008406f1 in EventFilter (this=0x2efa1c0, Sender=0x2f29d20, Event=0x7fffffffb8f0) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtwidgets.pas:17555
#38 0x0000000000841b8e in ViewPortEventFilter (this=0x2eeace0, event=0x7fffffffb8f0, retval=0x7fffffffb4a7) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtwidgets.pas:18083
#39 0x00007ffff7da2d16 in QLCLAbstractScrollArea::viewportEvent (this=0x2efaaf0, event=0x7fffffffb8f0) at /home/asd/s/lazarus/lcl/interfaces/qt6/cbindings/src/qlclabstractscrollarea.h:40
#40 0x00007ffff6cd4ffb in QAbstractScrollAreaPrivate::viewportEvent (this=0x2fb91a0, event=0x7fffffffb8f0) at /home/asd/s/qt/qtbase/src/widgets/widgets/qabstractscrollarea_p.h:74
#41 0x00007ffff6cd50f4 in QAbstractScrollAreaFilter::eventFilter (this=0x2efa9c0, o=0x2f29d20, e=0x7fffffffb8f0) at /home/asd/s/qt/qtbase/src/widgets/widgets/qabstractscrollarea_p.h:85
#42 0x00007ffff4f687a2 in QCoreApplicationPrivate::sendThroughObjectEventFilters (receiver=0x2f29d20, event=0x7fffffffb8f0) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1243
#43 0x00007ffff6b26cc6 in QApplicationPrivate::notify_helper (this=0x19965d0, receiver=0x2f29d20, e=0x7fffffffb8f0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qapplication.cpp:3295
#44 0x00007ffff6b26aae in QApplication::notify (this=0x19ad1f0, receiver=0x2f29d20, e=0x7fffffffb8f0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qapplication.cpp:3247
#45 0x00007ffff4f682b0 in QCoreApplication::notifyInternal2 (receiver=0x2f29d20, event=0x7fffffffb8f0) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1106
#46 0x00007ffff4f68ecb in QCoreApplication::sendSpontaneousEvent (receiver=0x2f29d20, event=0x7fffffffb8f0) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1560
#47 0x00007ffff6bb4d41 in QWidgetPrivate::sendPaintEvent (this=0x2ef6080, toBePainted=...) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5664
#48 0x00007ffff6bb4896 in QWidgetPrivate::drawWidget (this=0x2ef6080, pdev=0x21ea310, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5614
#49 0x00007ffff6bb5770 in QWidgetPrivate::paintSiblingsRecursive (this=0x2fb91a0, pdev=0x21ea310, siblings=..., index=1, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5793
#50 0x00007ffff6bb4cb7 in QWidgetPrivate::drawWidget (this=0x2fb91a0, pdev=0x21ea310, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5655
#51 0x00007ffff6bb5770 in QWidgetPrivate::paintSiblingsRecursive (this=0x30134a0, pdev=0x21ea310, siblings=..., index=0, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5793
#52 0x00007ffff6bb4cb7 in QWidgetPrivate::drawWidget (this=0x30134a0, pdev=0x21ea310, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5655
#53 0x00007ffff6bb5770 in QWidgetPrivate::paintSiblingsRecursive (this=0x2154700, pdev=0x21ea310, siblings=..., index=1, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5793
#54 0x00007ffff6bb4cb7 in QWidgetPrivate::drawWidget (this=0x2154700, pdev=0x21ea310, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5655
#55 0x00007ffff6bb5770 in QWidgetPrivate::paintSiblingsRecursive (this=0x2f4e3e0, pdev=0x21ea310, siblings=..., index=0, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5793
#56 0x00007ffff6bb4cb7 in QWidgetPrivate::drawWidget (this=0x2f4e3e0, pdev=0x21ea310, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5655
#57 0x00007ffff6bb5770 in QWidgetPrivate::paintSiblingsRecursive (this=0x2fb57a0, pdev=0x21ea310, siblings=..., index=0, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5793
#58 0x00007ffff6bb5615 in QWidgetPrivate::paintSiblingsRecursive (this=0x2fb57a0, pdev=0x21ea310, siblings=..., index=1, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5779
#59 0x00007ffff6bb4cb7 in QWidgetPrivate::drawWidget (this=0x2fb57a0, pdev=0x21ea310, rgn=..., offset=..., flags=..., sharedPainter=0x0, repaintManager=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:5655
#60 0x00007ffff6bee5d3 in QWidgetRepaintManager::paintAndFlush (this=0x2eeb7d0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidgetrepaintmanager.cpp:907
#61 0x00007ffff6becd5d in QWidgetRepaintManager::sync (this=0x2eeb7d0, exposedWidget=0x2f5a350, exposedRegion=...) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidgetrepaintmanager.cpp:632
#62 0x00007ffff6ba8c38 in QWidgetPrivate::syncBackingStore (this=0x2fb57a0, region=...) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidget.cpp:1780
#63 0x00007ffff6bfcc88 in QWidgetWindow::handleExposeEvent (this=0x2f1e930, event=0x7fffffffcef0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidgetwindow.cpp:1090
#64 0x00007ffff6bf943a in QWidgetWindow::event (this=0x2f1e930, event=0x7fffffffcef0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qwidgetwindow.cpp:339
#65 0x00007ffff6b26cf2 in QApplicationPrivate::notify_helper (this=0x19965d0, receiver=0x2f1e930, e=0x7fffffffcef0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qapplication.cpp:3301
#66 0x00007ffff6b26ad6 in QApplication::notify (this=0x19ad1f0, receiver=0x2f1e930, e=0x7fffffffcef0) at /home/asd/s/qt/qtbase/src/widgets/kernel/qapplication.cpp:3251
#67 0x00007ffff4f682b0 in QCoreApplication::notifyInternal2 (receiver=0x2f1e930, event=0x7fffffffcef0) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1106
#68 0x00007ffff4f68ecb in QCoreApplication::sendSpontaneousEvent (receiver=0x2f1e930, event=0x7fffffffcef0) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1560
#69 0x00007ffff5c64ef5 in QGuiApplicationPrivate::processExposeEvent (e=0x2181c10) at /home/asd/s/qt/qtbase/src/gui/kernel/qguiapplication.cpp:3487
#70 0x00007ffff5c5f72c in QGuiApplicationPrivate::processWindowSystemEvent (e=0x2181c10) at /home/asd/s/qt/qtbase/src/gui/kernel/qguiapplication.cpp:2281
#71 0x00007ffff5d2907a in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at /home/asd/s/qt/qtbase/src/gui/kernel/qwindowsysteminterface.cpp:1113
#72 0x00007ffff178c36c in xcbSourceDispatch (source=0x1a0cca0) at /home/asd/s/qt/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:57
#73 0x00007ffff78a7638 in ??? () at /lib64/libglib-2.0.so.0
#74 0x00007ffff78a9398 in ??? () at /lib64/libglib-2.0.so.0
#75 0x00007ffff78a9bac in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#76 0x00007ffff5410136 in QEventDispatcherGlib::processEvents (this=0x1a09580, flags=...) at /home/asd/s/qt/qtbase/src/corelib/kernel/qeventdispatcher_glib.cpp:399
#77 0x00007ffff178c5ca in QXcbGlibEventDispatcher::processEvents (this=0x1a09580, flags=...) at /home/asd/s/qt/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:96
#78 0x00007ffff4f6893b in QCoreApplication::processEvents (flags=...) at /home/asd/s/qt/qtbase/src/corelib/kernel/qcoreapplication.cpp:1341
#79 0x00007ffff7cea1c1 in QCoreApplication_processEvents (flags=0) at /home/asd/s/lazarus/lcl/interfaces/qt6/cbindings/src/qcoreapplication_c.cpp:107
#80 0x00000000006e1c67 in AppProcessMessages (this=0x19af9c0) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtobject.inc:335
#81 0x000000000051806d in HandleMessage (this=0x19aeaf0) at /home/asd/s/lazarus/lcl/include/application.inc:1309
#82 0x000000000051872d in RunLoop (this=0x19aeaf0) at /home/asd/s/lazarus/lcl/include/application.inc:1452
#83 0x00000000006e1c25 in AppRun (this=0x19af9c0, ALoop=...) at /home/asd/s/lazarus/lcl/interfaces/qt6/qtobject.inc:308
#84 0x00000000005186cc in Run (this=0x19aeaf0) at /home/asd/s/lazarus/lcl/include/application.inc:1440
#85 0x00000000004281d3 in $main () at /home/asd/s/doublecmd/src/doublecmd.lpr:252
    looks like it's not safe to call LCLIntf.ShowCaret inside paint event handler because it indirectly calls QCoreApplication::processEvents which may cause another paint event
    @xBZZZZ xBZZZZ added the bug Something isn't working label Apr 12, 2025
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