Bug 464967

I noticed that this also happens for user's own Dolphin instances as well, no need to run kdesu.

And I've only seen this on a PC with NVidia card (currently using binary nvidia drivers 525.85.05). Haven't seen it on Intel IGP PCs so far.

Still happening in 22.12.2, Plasma 5.27.0, KDE Frameworks 5.103.0, Qt 5 5.15.8+kde+r181, nvidia 525.89.02

Application: Dolphin (dolphin), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f20425e360d in ?? () from /usr/lib/libc.so.6
#5  0x00007f203c9c05d3 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#6  0x00007f203c9c0b77 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#7  0x00007f203c9c14ce in ?? () from /usr/lib/libQt5XcbQpa.so.5
#8  0x00007f20430afd45 in QBackingStore::flush(QRegion const&, QWindow*, QPoint const&) () from /usr/lib/libQt5Gui.so.5
#9  0x00007f20435bfe81 in ?? () from /usr/lib/libQt5Widgets.so.5
#10 0x00007f20435c03d5 in ?? () from /usr/lib/libQt5Widgets.so.5
#11 0x00007f20435c1ab9 in ?? () from /usr/lib/libQt5Widgets.so.5
#12 0x00007f204360df09 in ?? () from /usr/lib/libQt5Widgets.so.5
#13 0x00007f20435b5b5c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#14 0x00007f2042b3cf48 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#15 0x00007f2042f12206 in QGuiApplicationPrivate::processGeometryChangeEvent(QWindowSystemInterfacePrivate::GeometryChangeEvent*) () from /usr/lib/libQt5Gui.so.5
#16 0x00007f2042efa885 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#17 0x00007f203c9c78d0 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#18 0x00007f20407fd82b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#19 0x00007f2040854cc9 in ?? () from /usr/lib/libglib-2.0.so.0
#20 0x00007f20407fc0e2 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#21 0x00007f2042b87c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#22 0x00007f2042b356ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#23 0x00007f2042b40219 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#24 0x00005603399a5f53 in ?? ()
#25 0x00007f20424b3790 in ?? () from /usr/lib/libc.so.6
#26 0x00007f20424b384a in __libc_start_main () from /usr/lib/libc.so.6
#27 0x00005603399a6695 in ?? ()
[Inferior 1 (process 32100) detached]

Still happening with plasma 5.27.2, dolphin 22.12.3, nvidia 525.89.02
Also not restricted to Dolphin, happens with Konsole as well:

Application: Konsole (konsole), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f6ce0f6c60d in ?? () from /usr/lib/libc.so.6
#5  0x00007f6cdb67f5d3 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#6  0x00007f6cdb67fb77 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#7  0x00007f6cdb6804ce in ?? () from /usr/lib/libQt5XcbQpa.so.5
#8  0x00007f6ce1cddd45 in QBackingStore::flush(QRegion const&, QWindow*, QPoint const&) () from /usr/lib/libQt5Gui.so.5
#9  0x00007f6ce2382e81 in ?? () from /usr/lib/libQt5Widgets.so.5
#10 0x00007f6ce23833d5 in ?? () from /usr/lib/libQt5Widgets.so.5
#11 0x00007f6ce2384ab9 in ?? () from /usr/lib/libQt5Widgets.so.5
#12 0x00007f6ce23d0f09 in ?? () from /usr/lib/libQt5Widgets.so.5
#13 0x00007f6ce2378b5c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#14 0x00007f6ce168df48 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#15 0x00007f6ce1b40206 in QGuiApplicationPrivate::processGeometryChangeEvent(QWindowSystemInterfacePrivate::GeometryChangeEvent*) () from /usr/lib/libQt5Gui.so.5
#16 0x00007f6ce1b28885 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Gui.so.5
#17 0x00007f6cdb6868d0 in ?? () from /usr/lib/libQt5XcbQpa.so.5
#18 0x00007f6cdfa4682b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#19 0x00007f6cdfa9dcc9 in ?? () from /usr/lib/libglib-2.0.so.0
#20 0x00007f6cdfa450e2 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#21 0x00007f6ce16d8c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#22 0x00007f6ce16866ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQt5Core.so.5
#23 0x00007f6ce1691219 in QCoreApplication::exec() () from /usr/lib/libQt5Core.so.5
#24 0x00005644905e5b65 in ?? ()
#25 0x00007f6ce0e3c790 in ?? () from /usr/lib/libc.so.6
#26 0x00007f6ce0e3c84a in __libc_start_main () from /usr/lib/libc.so.6
#27 0x00005644905e6425 in ?? ()
[Inferior 1 (process 3486) detached]

Seems like this is a bug it Qt5. Should I report this elsewhere?

Might be related to https://bugs.kde.org/show_bug.cgi?id=461723

(In reply to Dick Tracey from comment #4)
> Might be related to https://bugs.kde.org/show_bug.cgi?id=461723

It is not related, 5.15.8+kde+r181-1 package does include the fix for that bug, yet the crash is still happening.

(In reply to Dick Tracey from comment #3)
> Still happening with plasma 5.27.2, dolphin 22.12.3, nvidia 525.89.02
> Also not restricted to Dolphin, happens with Konsole as well:
> 
> [backtrace]
> 
> Seems like this is a bug it Qt5. Should I report this elsewhere?

I unfortunately don't know. This is currently filed in Dolphin which seems wrong, but I can't tell you where it belongs to. I somehow doubt that reporting this to Qt, when it seems to be restricted to KDE code, will help, but I don't have that much experience with Qt's development.

Sorry for not being of more help!

I see, thanks anyway!

Here's a bit more useful crash log after I installed missing debug symbols



Application: Dolphin (dolphin), signal: Segmentation fault
Content of s_kcrashErrorMessage: std::unique_ptr<char []> = {get() = <optimized out>}
[KCrash Handler]
#6  __memcpy_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:265
#7  0x00007fb70e1275d3 in memmove (__len=262112, __src=0x7fb2398be810, __dest=<optimized out>) at /usr/include/bits/string_fortified.h:36
#8  copy_unswapped (rect=<synthetic pointer>..., img=..., dstBytesPerLine=262112, dst=<optimized out>) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:547
#9  native_sub_image (swap=false, rect=<synthetic pointer>..., src=..., dstStride=262112, buffer=0x560be64c3660) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:590
#10 QXcbBackingStoreImage::flushPixmap (this=this@entry=0x560be64c35e0, region=..., fullRegion=<optimized out>) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:669
#11 0x00007fb70e127913 in QXcbBackingStoreImage::flushPixmap (fullRegion=fullRegion@entry=true, this=this@entry=0x560be64c35e0, region=..., fullRegion=fullRegion@entry=true) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:690
#12 0x00007fb70e127b77 in QXcbBackingStoreImage::flushPixmap (fullRegion=false, region=..., this=0x560be64c35e0) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:627
#13 QXcbBackingStoreImage::put (this=0x560be64c35e0, dst=83886089, region=..., offset=...) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:741
#14 0x00007fb70e1284ce in QXcbBackingStore::flush (this=this@entry=0x560be65fd960, window=window@entry=0x560be64a11d0, region=..., offset=...) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbwindow.h:120
#15 0x00007fb7146ddd45 in QBackingStore::flush (this=this@entry=0x7fb7000061a0, region=..., window=0x560be64a11d0, offset=...) at painting/qbackingstore.cpp:252
#16 0x00007fb714d82e81 in QWidgetRepaintManager::flush (this=this@entry=0x560be67547f0, widget=0x560be62fdf40, region=..., widgetTextures=<optimized out>) at kernel/qwidgetrepaintmanager.cpp:1198
#17 0x00007fb714d833d5 in QWidgetRepaintManager::flush (this=this@entry=0x560be67547f0) at kernel/qwidgetrepaintmanager.cpp:1096
#18 0x00007fb714d84ab9 in QWidgetRepaintManager::paintAndFlush (this=0x560be67547f0) at kernel/qwidgetrepaintmanager.cpp:1028
#19 0x00007fb714dd0f09 in QWidgetWindow::handleResizeEvent (event=0x7ffe6fe45070, this=0x560be64a11d0) at kernel/qwidgetwindow.cpp:841
#20 QWidgetWindow::event (this=0x560be64a11d0, event=0x7ffe6fe45070) at kernel/qwidgetwindow.cpp:322
#21 0x00007fb714d78b5c in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x560be64a11d0, e=0x7ffe6fe45070) at kernel/qapplication.cpp:3640
#22 0x00007fb71408df48 in QCoreApplication::notifyInternal2 (receiver=0x560be64a11d0, event=0x7ffe6fe45070) at kernel/qcoreapplication.cpp:1064
#23 0x00007fb71408dfd3 in QCoreApplication::sendSpontaneousEvent (receiver=<optimized out>, event=<optimized out>) at kernel/qcoreapplication.cpp:1474
#24 0x00007fb714540206 in QGuiApplicationPrivate::processGeometryChangeEvent (e=<optimized out>) at kernel/qguiapplication.cpp:2610
#25 0x00007fb714528885 in QWindowSystemInterface::sendWindowSystemEvents (flags=flags@entry=...) at kernel/qwindowsysteminterface.cpp:1169
#26 0x00007fb70e12e8d0 in xcbSourceDispatch (source=<optimized out>) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:105

These look like the same issue maybe?

https://bugs.kde.org/show_bug.cgi?id=463475
https://bugs.kde.org/show_bug.cgi?id=467191

Forgot to mention: I have a dual monitor setup.

Monitors are of different brands, and their wake time are different by about 2-3 seconds.

Still happening in 23.04.0




Application: Dolphin (dolphin), signal: Segmentation fault
Content of s_kcrashErrorMessage: std::unique_ptr<char []> = {get() = <optimized out>}
[KCrash Handler]
#6  __memcpy_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:265
#7  0x00007f04a9c535d3 in memmove (__len=262112, __src=0x7effc58be810, __dest=<optimized out>) at /usr/include/bits/string_fortified.h:36
#8  copy_unswapped (rect=<synthetic pointer>..., img=..., dstBytesPerLine=262112, dst=<optimized out>) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:547
#9  native_sub_image (swap=false, rect=<synthetic pointer>..., src=..., dstStride=262112, buffer=0x5613f67151a0) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:590
#10 QXcbBackingStoreImage::flushPixmap(QRegion const&, bool) (this=this@entry=0x5613f6715120, region=..., fullRegion=<optimized out>) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:669
#11 0x00007f04a9c53913 in QXcbBackingStoreImage::flushPixmap(QRegion const&, bool) (fullRegion=<optimized out>, this=this@entry=0x5613f6715120, region=..., fullRegion=fullRegion@entry=true) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:690
#12 0x00007f04a9c53b77 in QXcbBackingStoreImage::flushPixmap(QRegion const&, bool) (fullRegion=false, region=..., this=0x5613f6715120) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:627
#13 QXcbBackingStoreImage::put(unsigned int, QRegion const&, QPoint const&) (this=0x5613f6715120, dst=62914569, region=..., offset=<optimized out>) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbbackingstore.cpp:741
#14 0x00007f04a9c544ce in QXcbBackingStore::flush(QWindow*, QRegion const&, QPoint const&) (this=this@entry=0x5613f6684640, window=window@entry=0x5613f66e3d60, region=..., offset=...) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbwindow.h:120
#15 0x00007f04afce45a5 in QBackingStore::flush(QRegion const&, QWindow*, QPoint const&) (this=this@entry=0x7f049c001f70, region=..., window=0x5613f66e3d60, offset=...) at painting/qbackingstore.cpp:252
#16 0x00007f04b0382e81 in QWidgetRepaintManager::flush(QWidget*, QRegion const&, QPlatformTextureList*) (this=this@entry=0x5613f6774d70, widget=0x5613f6367760, region=..., widgetTextures=<optimized out>) at kernel/qwidgetrepaintmanager.cpp:1198
#17 0x00007f04b03833d5 in QWidgetRepaintManager::flush() (this=this@entry=0x5613f6774d70) at kernel/qwidgetrepaintmanager.cpp:1096
#18 0x00007f04b0384ab9 in QWidgetRepaintManager::paintAndFlush() (this=0x5613f6774d70) at kernel/qwidgetrepaintmanager.cpp:1028
#19 0x00007f04b03d0f79 in QWidgetWindow::handleResizeEvent(QResizeEvent*) (event=0x7ffff75f8300, this=0x5613f66e3d60) at kernel/qwidgetwindow.cpp:842
#20 QWidgetWindow::event(QEvent*) (this=0x5613f66e3d60, event=0x7ffff75f8300) at kernel/qwidgetwindow.cpp:322
#21 0x00007f04b0378b5c in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=<optimized out>, receiver=0x5613f66e3d60, e=0x7ffff75f8300) at kernel/qapplication.cpp:3640
#22 0x00007f04af68e028 in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x5613f66e3d60, event=0x7ffff75f8300) at kernel/qcoreapplication.cpp:1064
#23 0x00007f04af68e0b3 in QCoreApplication::sendSpontaneousEvent(QObject*, QEvent*) (receiver=<optimized out>, event=<optimized out>) at kernel/qcoreapplication.cpp:1474
#24 0x00007f04afb41276 in QGuiApplicationPrivate::processGeometryChangeEvent(QWindowSystemInterfacePrivate::GeometryChangeEvent*) (e=<optimized out>) at kernel/qguiapplication.cpp:2610
#25 0x00007f04afb298c5 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) (flags=flags@entry=...) at kernel/qwindowsysteminterface.cpp:1169
#26 0x00007f04a9c5a8c0 in xcbSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:105
#27 0x00007f04ad50f53b in g_main_dispatch (context=0x7f04a4000ee0) at ../glib/glib/gmain.c:3460
#28 g_main_context_dispatch (context=0x7f04a4000ee0) at ../glib/glib/gmain.c:4200
#29 0x00007f04ad56c219 in g_main_context_iterate.constprop.0 (context=0x7f04a4000ee0, block=1, dispatch=1, self=<optimized out>) at ../glib/glib/gmain.c:4276
#30 0x00007f04ad50e1a2 in g_main_context_iteration (context=0x7f04a4000ee0, may_block=1) at ../glib/glib/gmain.c:4343
#31 0x00007f04af6d8d3c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x5613f5e381a0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#32 0x00007f04af68668c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ffff75f85f0, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#33 0x00007f04af6912f9 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#34 0x00007f04afb3b052 in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1870
#35 0x00007f04b0376f2a in QApplication::exec() () at kernel/qapplication.cpp:2832
#36 0x00005613f43b1dab in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/dolphin/dolphin-23.04.0/src/main.cpp:249
[Inferior 1 (process 3829) detached]

I also have the same problem with 23.08.1, it's reproducible every time I turn off my monitor and turn it back on.
BTW, every time when it crashed, it was allocating a large amount of RAM (about 6GiB or more).
OS: Arch Linux
CPU: AMD Ryzen 5 5600X
GPU: AMD RX6500XT

*** This bug has been marked as a duplicate of bug 473602 ***