Bug 501588

Created attachment 179464 [details]
New crash information added by DrKonqi

DrKonqi auto-attaching complete backtrace.

Thread 1 (Thread 0x7f0ea106dd80 (LWP 3165)):
[KCrash Handler]
#5  0x00007f0e93196898 in QXcbVirtualDesktop::screen (this=<optimized out>) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbscreen.h:38
#6  QXcbScreen::screen (this=<optimized out>) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbscreen.h:152
#7  QXcbScreen::root (this=<optimized out>) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbscreen.h:153
#8  QXcbWindow::handleConfigureNotifyEvent (this=0x55c6bb1bb760, event=0x7f0e8400d860) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbwindow.cpp:1815
#9  0x00007f0e93156058 in QXcbConnection::handleXcbEvent (this=this@entry=0x55c6b8c35fa0, event=event@entry=0x7f0e8400d860) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbconnection.cpp:634
#10 0x00007f0e93157407 in QXcbConnection::processXcbEvents (this=0x55c6b8c35fa0, flags=...) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbconnection.cpp:1086
#11 0x00007f0e931788ff in xcbSourceDispatch (source=<optimized out>) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:55
#12 0x00007f0ea61b428c in g_main_dispatch (context=0x7f0e8c000f00) at ../glib/gmain.c:3357
#13 g_main_context_dispatch_unlocked (context=0x7f0e8c000f00) at ../glib/gmain.c:4208
#14 0x00007f0ea62147b8 in g_main_context_iterate_unlocked.isra.0 (context=context@entry=0x7f0e8c000f00, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4273
#15 0x00007f0ea61b5783 in g_main_context_iteration (context=0x7f0e8c000f00, may_block=1) at ../glib/gmain.c:4338
#16 0x00007f0ea79ef2b3 in QEventDispatcherGlib::processEvents (this=0x55c6b8cb0820, flags=...) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/corelib/kernel/qeventdispatcher_glib.cpp:399
#17 0x00007f0ea7700993 in QEventLoop::exec (this=this@entry=0x7ffd9e6dccd0, flags=..., flags@entry=...) at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/corelib/global/qflags.h:34
#18 0x00007f0ea76fbf6e in QCoreApplication::exec () at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/corelib/global/qflags.h:74
#19 0x00007f0ea7ed7d3d in QGuiApplication::exec () at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/gui/kernel/qguiapplication.cpp:1975
#20 0x00007f0ea9a3d929 in QApplication::exec () at /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/widgets/kernel/qapplication.cpp:2564
#21 0x000055c6878f32fe in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/plasma-workspace-6.3.2-1.fc41.x86_64/shell/main.cpp:191

Not seeing any KDE code in the backtrace; could be a Qt issue. Maybe it's the X11 equivalent of Bug 499383?

Created attachment 179513 [details]
attachment-4100042-0.html

|Ahm, I'm not into KDE nor Qt. This info was gathered by a tool. Looking 
at the sources @ qt.io 
(https://code.qt.io/cgit/qt/qtbase.git/tree/src/plugins/platforms/xcb/qxcbscreen.h?h=6.8.2), 
that's the first frames of the callstack. Bug |499383 seems in a different code area.
  |1: xcb_screen_t *screen() const { return m_screen; } ||2: xcb_screen_t *screen() const { return m_virtualDesktop->screen(); } ||3: xcb_window_t root() const { return screen()->root; } ||4: auto reply = Q_XCB_REPLY(xcb_translate_coordinates, 
xcb_connection(), xcb_window(), xcbScreen()->root(), 0, 0); 5: |
|case XCB_FOCUS_OUT: HANDLE_PLATFORM_WINDOW_EVENT(xcb_focus_out_event_t, 
event, handleFocusOutEvent);||..... A segmentation fault at (1) is most likely due to a crab ||QXcbScreen::|/|m_virtualDesktop|/ |pointer. S.b. wants to handle an event while ||/QXcbScreen/'s ||virtual desktop is gone. M.b. also the QXcbScreen instance is already 
deleted at this time. That could be because desktop configuration was 
being changed in that moment because I closed the laptop lid and thus 
the laptop screen was deactivated. At some higher level of the 
callstack, events need to be stopped before deleting ||the virtual desktop|||||

On 17.03.25 20:18, Nate Graham wrote:
> https://bugs.kde.org/show_bug.cgi?id=501588
>
> Nate Graham<nate@kde.org> changed:
>
>             What    |Removed                     |Added
> ----------------------------------------------------------------------------
>              Summary|Plasmashell crashed after   |On X11, Plasmashell crashed
>                     |closing laptop lid right    |after closing laptop lid
>                     |after login.                |right after login
>             Keywords|                            |X11-only
>                   CC|                            |nate@kde.org
>
> --- Comment #2 from Nate Graham<nate@kde.org> ---
> Thread 1 (Thread 0x7f0ea106dd80 (LWP 3165)):
> [KCrash Handler]
> #5  0x00007f0e93196898 in QXcbVirtualDesktop::screen (this=<optimized out>) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbscreen.h:38
> #6  QXcbScreen::screen (this=<optimized out>) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbscreen.h:152
> #7  QXcbScreen::root (this=<optimized out>) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbscreen.h:153
> #8  QXcbWindow::handleConfigureNotifyEvent (this=0x55c6bb1bb760,
> event=0x7f0e8400d860) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbwindow.cpp:1815
> #9  0x00007f0e93156058 in QXcbConnection::handleXcbEvent
> (this=this@entry=0x55c6b8c35fa0, event=event@entry=0x7f0e8400d860) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbconnection.cpp:634
> #10 0x00007f0e93157407 in QXcbConnection::processXcbEvents
> (this=0x55c6b8c35fa0, flags=...) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbconnection.cpp:1086
> #11 0x00007f0e931788ff in xcbSourceDispatch (source=<optimized out>) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:55
> #12 0x00007f0ea61b428c in g_main_dispatch (context=0x7f0e8c000f00) at
> ../glib/gmain.c:3357
> #13 g_main_context_dispatch_unlocked (context=0x7f0e8c000f00) at
> ../glib/gmain.c:4208
> #14 0x00007f0ea62147b8 in g_main_context_iterate_unlocked.isra.0
> (context=context@entry=0x7f0e8c000f00, block=block@entry=1,
> dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4273
> #15 0x00007f0ea61b5783 in g_main_context_iteration (context=0x7f0e8c000f00,
> may_block=1) at ../glib/gmain.c:4338
> #16 0x00007f0ea79ef2b3 in QEventDispatcherGlib::processEvents
> (this=0x55c6b8cb0820, flags=...) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/corelib/kernel/qeventdispatcher_glib.cpp:399
> #17 0x00007f0ea7700993 in QEventLoop::exec (this=this@entry=0x7ffd9e6dccd0,
> flags=..., flags@entry=...) at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/corelib/global/qflags.h:34
> #18 0x00007f0ea76fbf6e in QCoreApplication::exec () at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/corelib/global/qflags.h:74
> #19 0x00007f0ea7ed7d3d in QGuiApplication::exec () at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/gui/kernel/qguiapplication.cpp:1975
> #20 0x00007f0ea9a3d929 in QApplication::exec () at
> /usr/src/debug/qt6-qtbase-6.8.2-3.fc41.x86_64/src/widgets/kernel/qapplication.cpp:2564
> #21 0x000055c6878f32fe in main (argc=<optimized out>, argv=<optimized out>) at
> /usr/src/debug/plasma-workspace-6.3.2-1.fc41.x86_64/shell/main.cpp:191
>
> Not seeing any KDE code in the backtrace; could be a Qt issue. Maybe it's the
> X11 equivalent of Bug 499383?
>

*** Bug 502818 has been marked as a duplicate of this bug. ***

*** Bug 503833 has been marked as a duplicate of this bug. ***

Sentry says there have been no further reports from affected people following their upgrade to Plasma 6.3.5; closing.

I did actually experienced this again last week, I didn't report it because I knew there was already an open bug report.