Bug 507613 - kwin_wayland often crashes in std::__atomic_base<T>::fetch_add
Summary: kwin_wayland often crashes in std::__atomic_base<T>::fetch_add
Status: NEEDSINFO WAITINGFORINFO
Alias: None
Product: kwin
Classification: Plasma
Component: generic-crash (other bugs)
Version First Reported In: 6.4.3
Platform: Neon Linux
: NOR crash
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: drkonqi
Depends on:
Blocks:
 
Reported: 2025-07-28 22:38 UTC by NitramO
Modified: 2026-02-06 03:50 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report: https://crash-reports.kde.org/organizations/kde/issues/225504/events/58768fef85e14a418e357c6c38a6e7a8/

Attachments
New crash information added by DrKonqi (109.18 KB, text/plain)
2025-07-28 22:38 UTC, NitramO 		Details
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Description NitramO 2025-07-28 22:38:26 UTC 
Application: kwin_wayland (6.4.3)

ApplicationNotResponding [ANR]: false
Qt Version: 6.9.1
Frameworks Version: 6.16.0
Operating System: Linux 6.14.0-24-generic x86_64
Windowing System: Wayland
Distribution: KDE neon User Edition
DrKonqi: 6.4.3 [CoredumpBackend]

-- Information about the crash:
It crashed while I was just using my computer. (Like I opened or closed Brave Browser and Dolphin file explorer or something) It's been happening more and more since the last two updates... This is one of the reasons why I left Windows to switch to Linux, it's starting to bother me...

The reporter is unsure if this crash is reproducible.

-- Backtrace (Reduced):
#6  std::__atomic_base<int>::fetch_add (this=0x4d1, __i=1, __m=std::memory_order::acq_rel) at /usr/include/c++/14/bits/atomic_base.h:629
#7  QAtomicOps<int>::ref<int> (_q_value=<error reading variable: Cannot access memory at address 0x4d1>) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qatomic_cxx11.h:259
[...]
#11 QArrayDataPointer<KWin::VirtualDesktop*>::QArrayDataPointer (this=0x7ffc703e3590, other=...) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qarraydatapointer.h:40
#12 QList<KWin::VirtualDesktop*>::QList (this=0x7ffc703e3590, this=<optimized out>) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qlist.h:76
#13 KWin::Window::desktops (this=this@entry=0x6288110fe090) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/window.cpp:806
#14 0x0000754b20a3ad30 in KWin::Window::isOnAllDesktops (this=0x6288110fe090) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/window.h:2090
#15 KWin::Window::isOnDesktop (this=0x6288110fe090, desktop=0x62880e889680) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/window.cpp:824
#16 0x0000754b20c0967d in KWin::TabBox::TabBoxHandlerImpl::checkDesktop (this=0x62880e79dc80, client=0x6288110fe090) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/tabbox.cpp:94
#17 KWin::TabBox::TabBoxHandlerImpl::clientToAddToList (this=0x62880e79dc80, client=0x6288110fe090) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/tabbox.cpp:163
#18 0x0000754b20c0f0df in KWin::TabBox::ClientModel::createFocusChainClientList (this=0x62880e7b90f0, start=<optimized out>) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/clientmodel.cpp:158
#19 KWin::TabBox::ClientModel::createClientList (this=0x62880e7b90f0, partialReset=true) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/clientmodel.cpp:213
#20 KWin::TabBox::TabBoxHandler::createModel (this=0x62880e79dc80, partialReset=true) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/tabboxhandler.cpp:474
#21 KWin::TabBox::TabBox::reset (this=0x62880dc84eb0, partial_reset=true) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/tabbox.cpp:400
#22 0x0000754b20a5150b in KWin::Workspace::addWaylandWindow (this=0x62880dc135c0, window=<optimized out>) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/workspace.cpp:786
#23 0x0000754b1e07cce9 in QtPrivate::QSlotObjectBase::call (a=0x7ffc703e3880, r=<optimized out>, this=0x62880eb1c450, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobjectdefs_impl.h:461
#24 doActivate<false> (sender=0x62880da09ff0, signal_index=3, argv=0x7ffc703e3880) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobject.cpp:4146


Reported using DrKonqi
Comment 1 NitramO 2025-07-28 22:38:27 UTC 
Created attachment 183614 [details]
New crash information added by DrKonqi

DrKonqi auto-attaching complete backtrace.
Comment 2 TraceyC 2025-07-28 23:04:15 UTC 
Searchable backtrace


Thread 1 (Thread 0x754b0cf99d80 (LWP 2892)):
[KCrash Handler]
#6  std::__atomic_base<int>::fetch_add (this=0x4d1, __i=1, __m=std::memory_order::acq_rel) at /usr/include/c++/14/bits/atomic_base.h:629
#7  QAtomicOps<int>::ref<int> (_q_value=<error reading variable: Cannot access memory at address 0x4d1>) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qatomic_cxx11.h:259
#8  QBasicAtomicInteger<int>::ref (this=0x4d1) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qbasicatomic.h:47
#9  QArrayData::ref (this=0x4d1, this=<optimized out>) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qarraydata.h:59
#10 QArrayDataPointer<KWin::VirtualDesktop*>::ref (this=0x7ffc703e3590) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qarraydatapointer.h:451
#11 QArrayDataPointer<KWin::VirtualDesktop*>::QArrayDataPointer (this=0x7ffc703e3590, other=...) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qarraydatapointer.h:40
#12 QList<KWin::VirtualDesktop*>::QList (this=0x7ffc703e3590, this=<optimized out>) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qlist.h:76
#13 KWin::Window::desktops (this=this@entry=0x6288110fe090) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/window.cpp:806
#14 0x0000754b20a3ad30 in KWin::Window::isOnAllDesktops (this=0x6288110fe090) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/window.h:2090
#15 KWin::Window::isOnDesktop (this=0x6288110fe090, desktop=0x62880e889680) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/window.cpp:824
#16 0x0000754b20c0967d in KWin::TabBox::TabBoxHandlerImpl::checkDesktop (this=0x62880e79dc80, client=0x6288110fe090) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/tabbox.cpp:94
#17 KWin::TabBox::TabBoxHandlerImpl::clientToAddToList (this=0x62880e79dc80, client=0x6288110fe090) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/tabbox.cpp:163
#18 0x0000754b20c0f0df in KWin::TabBox::ClientModel::createFocusChainClientList (this=0x62880e7b90f0, start=<optimized out>) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/clientmodel.cpp:158
#19 KWin::TabBox::ClientModel::createClientList (this=0x62880e7b90f0, partialReset=true) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/clientmodel.cpp:213
#20 KWin::TabBox::TabBoxHandler::createModel (this=0x62880e79dc80, partialReset=true) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/tabboxhandler.cpp:474
#21 KWin::TabBox::TabBox::reset (this=0x62880dc84eb0, partial_reset=true) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/tabbox/tabbox.cpp:400
#22 0x0000754b20a5150b in KWin::Workspace::addWaylandWindow (this=0x62880dc135c0, window=<optimized out>) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/workspace.cpp:786
#23 0x0000754b1e07cce9 in QtPrivate::QSlotObjectBase::call (a=0x7ffc703e3880, r=<optimized out>, this=0x62880eb1c450, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobjectdefs_impl.h:461
#24 doActivate<false> (sender=0x62880da09ff0, signal_index=3, argv=0x7ffc703e3880) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobject.cpp:4146
#25 0x0000754b20a2aad1 in QMetaObject::activate<void, KWin::Window*> (sender=<optimized out>, mo=<optimized out>, local_signal_index=0, ret=0x0, sender=<optimized out>, mo=<optimized out>, local_signal_index=<optimized out>, ret=<optimized out>) at /usr/include/x86_64-linux-gnu/qt6/QtCore/qobjectdefs.h:306
#26 KWin::WaylandServer::windowAdded (this=<optimized out>, _t1=<optimized out>) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/obj-x86_64-linux-gnu/src/kwin_autogen/include/moc_wayland_server.cpp:149
#27 0x0000754b1e07cce9 in QtPrivate::QSlotObjectBase::call (a=0x7ffc703e3928, r=<optimized out>, this=0x62880f4a4ea0, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobjectdefs_impl.h:461
#28 doActivate<false> (sender=0x628812c39820, signal_index=61, argv=0x7ffc703e3928) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobject.cpp:4146
#29 0x0000754b1e07cce9 in QtPrivate::QSlotObjectBase::call (a=0x7ffc703e39f8, r=<optimized out>, this=0x62880ff5ef20, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobjectdefs_impl.h:461
#30 doActivate<false> (sender=0x628810540d50, signal_index=26, argv=0x7ffc703e39f8) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobject.cpp:4146
#31 0x0000754b20bb8a3f in KWin::SurfaceInterfacePrivate::applyState (this=0x6288135abe90, next=<optimized out>) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/wayland/surface.cpp:805
#32 0x0000754b20be52a4 in KWin::Transaction::apply (this=0x628810cb5b10) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/wayland/transaction.cpp:169
#33 0x0000754b1be2ab16 in ffi_call_unix64 () at ../src/x86/unix64.S:104
#34 0x0000754b1be273ef in ffi_call_int (cif=cif@entry=0x7ffc703e4220, fn=<optimized out>, rvalue=<optimized out>, avalue=<optimized out>, closure=closure@entry=0x0) at ../src/x86/ffi64.c:673
#35 0x0000754b1be2a0be in ffi_call (cif=cif@entry=0x7ffc703e4220, fn=<optimized out>, rvalue=rvalue@entry=0x0, avalue=avalue@entry=0x7ffc703e42f0) at ../src/x86/ffi64.c:710
#36 0x0000754b1daaa673 in wl_closure_invoke (closure=closure@entry=0x62880f6f1d80, target=<optimized out>, target@entry=0x62881279d2c0, opcode=opcode@entry=6, data=<optimized out>, data@entry=0x62880f87b240, flags=2) at ../src/connection.c:1228
#37 0x0000754b1daaf39e in wl_client_connection_data (fd=<optimized out>, mask=<optimized out>, data=0x62880f87b240) at ../src/wayland-server.c:444
#38 0x0000754b1daad7f2 in wl_event_loop_dispatch (loop=0x62880dade400, timeout=<optimized out>) at ../src/event-loop.c:1105
#39 0x0000754b20b50249 in KWin::Display::dispatchEvents (this=<optimized out>) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/wayland/display.cpp:138
#40 0x0000754b1e07cce9 in QtPrivate::QSlotObjectBase::call (a=0x7ffc703e4920, r=<optimized out>, this=0x62880ee167b0, this=<optimized out>, r=<optimized out>, a=<optimized out>) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobjectdefs_impl.h:461
#41 doActivate<false> (sender=0x62880ee5f430, signal_index=3, argv=0x7ffc703e4920) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobject.cpp:4146
#42 0x0000754b1e12fb23 in QMetaObject::activate<void, QSocketDescriptor, QSocketNotifier::Type, QSocketNotifier::QPrivateSignal> (ret=0x0, local_signal_index=0, mo=<optimized out>, sender=0x62880ee5f430) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qobjectdefs.h:306
#43 QSocketNotifier::activated (this=this@entry=0x62880ee5f430, _t1=..., _t2=<optimized out>, _t3=...) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/obj-x86_64-linux-gnu/src/corelib/Core_autogen/include/moc_qsocketnotifier.cpp:161
#44 0x0000754b1e12fcc0 in QSocketNotifier::event (this=0x62880ee5f430, e=<optimized out>) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qsocketnotifier.cpp:327
#45 0x0000754b1f43e21d in QApplicationPrivate::notify_helper (this=<optimized out>, receiver=0x62880ee5f430, e=0x7ffc703e4a70) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/widgets/kernel/qapplication.cpp:3303
#46 0x0000754b1e0b6340 in QCoreApplication::notifyInternal2 (receiver=0x62880ee5f430, event=0x7ffc703e4a70) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qcoreapplication.cpp:1106
#47 0x0000754b1df965cc in QEventDispatcherUNIXPrivate::activateSocketNotifiers (this=this@entry=0x62880da112f0) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qeventdispatcher_unix.cpp:254
#48 0x0000754b1df970d4 in QEventDispatcherUNIX::processEvents (this=<optimized out>, flags=..., flags@entry=...) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/kernel/qeventdispatcher_unix.cpp:470
#49 0x0000754b1eb74952 in QUnixEventDispatcherQPA::processEvents (this=<optimized out>, flags=...) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/gui/platform/unix/qunixeventdispatcher.cpp:27
#50 0x0000754b1e0c0b6b in QEventLoop::exec (this=0x7ffc703e4c50, flags=...) at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/global/qflags.h:77
#51 0x0000754b1e0b96ef in QCoreApplication::exec () at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/corelib/global/qflags.h:77
#52 0x0000754b1e6de8fd in QGuiApplication::exec () at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/gui/kernel/qguiapplication.cpp:1986
#53 0x0000754b1f43a4f9 in QApplication::exec () at /usr/src/qt6-base-6.9.1-0zneon+24.04+noble+release+build117/src/widgets/kernel/qapplication.cpp:2570
#54 0x00006287d147c548 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/kwin-4:6.4.3-0zneon+24.04+noble+release+build48/src/main_wayland.cpp:635
Comment 3 Vlad Zahorodnii 2025-07-29 09:57:02 UTC 
If you find a reliable way to reproduce the crash, please let us know.
Comment 4 NitramO 2025-07-30 21:00:04 UTC 
(In reply to Vlad Zahorodnii from comment #3)
> If you find a reliable way to reproduce the crash, please let us know.

You should look at bug 507673 https://bugs.kde.org/show_bug.cgi?id=507673
Comment 5 TraceyC 2025-07-30 21:08:51 UTC 
The other report has a different backtrace
Comment 6 Vlad Zahorodnii 2026-01-22 13:07:06 UTC 
Does the crash happen in 6.5 or 6.6?
Comment 7 Bug Janitor Service 2026-02-06 03:50:37 UTC 
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME.

For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging.

Thank you for helping us make KDE software even better for everyone!