SUMMARY
kwin_x11 crashed when I pressed Alt+Tab to switch windows. I remember similar crashes happening recently (this year), but most of the time Alt+Tab succeeds without issues.

I have found reports of crashes on Wayland, but the backtrace looks different in my case (and I am on X11), so I am reporting it separately.

STEPS TO REPRODUCE (not every time)
1. Alt+Tab

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 5.27.3
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8
Kernel Version: 6.2.8-arch1-1 (64-bit)
Graphics Platform: X11
Graphics Processor: AMD Radeon Vega 8 Graphics

BACKTRACE
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Core was generated by `/usr/bin/kwin_x11 --replace'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __GI___pthread_sigmask (how=1, newmask=<optimized out>, oldmask=0x0) at pthread_sigmask.c:43
Downloading source file /usr/src/debug/glibc/glibc/nptl/pthread_sigmask.c...
43	  return (INTERNAL_SYSCALL_ERROR_P (result)
[Current thread is 1 (Thread 0x7fbee161a180 (LWP 3532))]

[Current thread is 13 (Thread 0x7fbec53ff6c0 (LWP 6454))]

Thread 16 (Thread 0x7fbeafbff6c0 (LWP 4789)):
#0  0x00007fbee5a2b9df in __GI___poll (fds=0x7fbea40013b0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fbee456c17f in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7fbea40013b0, timeout=<optimized out>, context=0x7fbea4000b90) at ../glib/glib/gmain.c:4584
#2  g_main_context_iterate.constprop.0 (context=0x7fbea4000b90, block=1, dispatch=1, self=<optimized out>) at ../glib/glib/gmain.c:4271
#3  0x00007fbee450e1a2 in g_main_context_iteration (context=0x7fbea4000b90, may_block=1) at ../glib/glib/gmain.c:4343
#4  0x00007fbee6ad8c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fbea4001040, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007fbee6a866ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fbeafbfeca0, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#6  0x00007fbee68e725f in QThread::exec() (this=this@entry=0x55c6fa7db740) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007fbee78c00e0 in QQmlThreadPrivate::run() (this=0x55c6fa7db740) at /usr/src/debug/qt5-declarative/qtdeclarative/src/qml/qml/ftw/qqmlthread.cpp:155
#8  0x00007fbee68e432a in QThreadPrivate::start(void*) (arg=0x55c6fa7db740) at thread/qthread_unix.cpp:330
#9  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#10 0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 15 (Thread 0x7fbeaebfd6c0 (LWP 3701)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6f95535d8) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6f95535d8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6f95535d8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6f9553588, cond=0x55c6f95535b0) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6f95535b0, mutex=0x55c6f9553588) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 14 (Thread 0x7fbe7970f6c0 (LWP 6456)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6fad71a60) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6fad71a60, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6fad71a60, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6fad71a10, cond=0x55c6fad71a38) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6fad71a38, mutex=0x55c6fad71a10) at pthread_cond_wait.c:618
#5  0x00007fbee68eb7c4 in QWaitConditionPrivate::wait(QDeadlineTimer) (deadline=..., this=0x55c6fad71a10) at thread/qwaitcondition_unix.cpp:146
#6  QWaitCondition::wait(QMutex*, QDeadlineTimer) (this=this@entry=0x55c6fac3c298, mutex=mutex@entry=0x55c6fac3c290, deadline=...) at thread/qwaitcondition_unix.cpp:225
#7  0x00007fbee7dfd393 in QSGRenderThreadEventQueue::takeEvent(bool) (wait=true, this=0x55c6fac3c288) at /usr/src/debug/qt5-declarative/qtdeclarative/src/quick/scenegraph/qsgthreadedrenderloop.cpp:257
#8  QSGRenderThread::processEventsAndWaitForMore() (this=0x55c6fac3c1f0) at /usr/src/debug/qt5-declarative/qtdeclarative/src/quick/scenegraph/qsgthreadedrenderloop.cpp:935
#9  QSGRenderThread::run() (this=0x55c6fac3c1f0) at /usr/src/debug/qt5-declarative/qtdeclarative/src/quick/scenegraph/qsgthreadedrenderloop.cpp:1052
#10 0x00007fbee68e432a in QThreadPrivate::start(void*) (arg=0x55c6fac3c1f0) at thread/qthread_unix.cpp:330
#11 0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#12 0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 13 (Thread 0x7fbec53ff6c0 (LWP 6454)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x7fbe7350b588) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7fbe7350b588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7fbe7350b588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fbe7350b538, cond=0x7fbe7350b560) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x7fbe7350b560, mutex=0x7fbe7350b538) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 12 (Thread 0x7fbead3fa6c0 (LWP 3707)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6f95c2e28) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6f95c2e28, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6f95c2e28, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6f95c2dd8, cond=0x55c6f95c2e00) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6f95c2e00, mutex=0x55c6f95c2dd8) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 11 (Thread 0x7fbeae3fc6c0 (LWP 3702)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6f95535d8) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6f95535d8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6f95535d8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6f9553588, cond=0x55c6f95535b0) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6f95535b0, mutex=0x55c6f9553588) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 10 (Thread 0x7fbec4bfe6c0 (LWP 3679)):
#0  0x00007fbee5a2b9df in __GI___poll (fds=0x7fbea80013d0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fbee456c17f in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7fbea80013d0, timeout=<optimized out>, context=0x7fbea8000c30) at ../glib/glib/gmain.c:4584
#2  g_main_context_iterate.constprop.0 (context=0x7fbea8000c30, block=1, dispatch=1, self=<optimized out>) at ../glib/glib/gmain.c:4271
#3  0x00007fbee450e1a2 in g_main_context_iteration (context=0x7fbea8000c30, may_block=1) at ../glib/glib/gmain.c:4343
#4  0x00007fbee6ad8c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fbea8000b70, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007fbee6a866ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fbec4bfdca0, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#6  0x00007fbee68e725f in QThread::exec() (this=this@entry=0x55c6f99e8b20) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007fbee78c00e0 in QQmlThreadPrivate::run() (this=0x55c6f99e8b20) at /usr/src/debug/qt5-declarative/qtdeclarative/src/qml/qml/ftw/qqmlthread.cpp:155
#8  0x00007fbee68e432a in QThreadPrivate::start(void*) (arg=0x55c6f99e8b20) at thread/qthread_unix.cpp:330
#9  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#10 0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 9 (Thread 0x7fbeadbfb6c0 (LWP 3704)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6f95c2e2c) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6f95c2e2c, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6f95c2e2c, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6f95c2dd8, cond=0x55c6f95c2e00) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6f95c2e00, mutex=0x55c6f95c2dd8) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 8 (Thread 0x7fbeaf3fe6c0 (LWP 3690)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x7fbecc04958c) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7fbecc04958c, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7fbecc04958c, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fbecc049538, cond=0x7fbecc049560) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x7fbecc049560, mutex=0x7fbecc049538) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 7 (Thread 0x7fbec67fc6c0 (LWP 3606)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x7fbed8321588) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x7fbed8321588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7fbed8321588, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fbed8321538, cond=0x7fbed8321560) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x7fbed8321560, mutex=0x7fbed8321538) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 6 (Thread 0x7fbee10c96c0 (LWP 3541)):
#0  0x00007fbee5a2b9df in __GI___poll (fds=0x7fbedc001600, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fbee456c17f in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7fbedc001600, timeout=<optimized out>, context=0x7fbedc000c50) at ../glib/glib/gmain.c:4584
#2  g_main_context_iterate.constprop.0 (context=0x7fbedc000c50, block=1, dispatch=1, self=<optimized out>) at ../glib/glib/gmain.c:4271
#3  0x00007fbee450e1a2 in g_main_context_iteration (context=0x7fbedc000c50, may_block=1) at ../glib/glib/gmain.c:4343
#4  0x00007fbee6ad8c8f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fbedc000b70, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007fbee6a866ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fbee10c8c90, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#6  0x00007fbee68e725f in QThread::exec() (this=this@entry=0x7fbee5f73560 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007fbee5f17cba in QDBusConnectionManager::run() (this=0x7fbee5f73560 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at /usr/src/debug/qt5-base/qtbase/src/dbus/qdbusconnection.cpp:179
#8  0x00007fbee68e432a in QThreadPrivate::start(void*) (arg=0x7fbee5f73560 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:330
#9  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#10 0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 5 (Thread 0x7fbec6ffd6c0 (LWP 3568)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6f9553b48) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6f9553b48, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6f9553b48, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6f9553af8, cond=0x55c6f9553b20) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6f9553b20, mutex=0x55c6f9553af8) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 4 (Thread 0x7fbed90976c0 (LWP 3565)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6f9542f78) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6f9542f78, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6f9542f78, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6f9542f28, cond=0x55c6f9542f50) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6f9542f50, mutex=0x55c6f9542f28) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 3 (Thread 0x7fbec77fe6c0 (LWP 3567)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6f95535d8) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6f95535d8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6f95535d8, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6f9553588, cond=0x55c6f95535b0) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6f95535b0, mutex=0x55c6f9553588) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 2 (Thread 0x7fbec7fff6c0 (LWP 3566)):
#0  __futex_abstimed_wait_common64 (private=0, cancel=true, abstime=0x0, op=393, expected=0, futex_word=0x55c6f95c2e2c) at futex-internal.c:57
#1  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55c6f95c2e2c, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#2  0x00007fbee59b37cf in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55c6f95c2e2c, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#3  0x00007fbee59b5f90 in __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55c6f95c2dd8, cond=0x55c6f95c2e00) at pthread_cond_wait.c:503
#4  ___pthread_cond_wait (cond=0x55c6f95c2e00, mutex=0x55c6f95c2dd8) at pthread_cond_wait.c:618
#5  0x00007fbed92c284c in cnd_wait () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:135
#6  util_queue_thread_func() () at ../mesa-23.0.1/src/util/u_queue.c:290
#7  0x00007fbed930bc6c in impl_thrd_routine() () at ../mesa-23.0.1/src/c11/impl/threads_posix.c:67
#8  0x00007fbee59b6bb5 in start_thread (arg=<optimized out>) at pthread_create.c:444
#9  0x00007fbee5a38d90 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

Thread 1 (Thread 0x7fbee161a180 (LWP 3532)):
[KCrash Handler]
#5  0x0000000000000000 in  ()
#6  0x000055c6f7ac8607 in KWin::isHighlightWindow (window=0x55c6fcba4780) at /usr/src/debug/kwin/kwin-5.27.3/src/effects/highlightwindow/highlightwindow.cpp:57
#7  KWin::HighlightWindowEffect::finishHighlighting() (this=this@entry=0x55c6fa310f80) at /usr/src/debug/kwin/kwin-5.27.3/src/effects/highlightwindow/highlightwindow.cpp:178
#8  0x000055c6f7ac8db8 in KWin::HighlightWindowEffect::highlightWindows(QVector<KWin::EffectWindow*> const&) (windows=..., this=0x55c6fa310f80) at /usr/src/debug/kwin/kwin-5.27.3/src/effects/highlightwindow/highlightwindow.cpp:198
#9  KWin::HighlightWindowEffect::perform(KWin::Effect::Feature, QList<QVariant> const&) (feature=<optimized out>, arguments=<optimized out>, this=0x55c6fa310f80) at /usr/src/debug/kwin/kwin-5.27.3/src/effects/highlightwindow/highlightwindow.cpp:272
#10 KWin::HighlightWindowEffect::perform(KWin::Effect::Feature, QList<QVariant> const&) (this=0x55c6fa310f80, feature=<optimized out>, arguments=<optimized out>) at /usr/src/debug/kwin/kwin-5.27.3/src/effects/highlightwindow/highlightwindow.cpp:264
#11 0x00007fbee8402d07 in KWin::EffectsHandlerImpl::highlightWindows(QVector<KWin::EffectWindow*> const&) (this=<optimized out>, windows=...) at /usr/src/debug/kwin/kwin-5.27.3/src/effects.cpp:1693
#12 0x00007fbee8626592 in KWin::TabBox::TabBoxHandlerImpl::highlightWindows(KWin::TabBox::TabBoxClient*, QWindow*) (this=<optimized out>, window=<optimized out>, controller=0x0) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/tabbox.cpp:355
#13 0x00007fbee8629b0a in KWin::TabBox::TabBoxHandlerPrivate::endHighlightWindows(bool) (abort=false, this=<optimized out>) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/tabboxhandler.cpp:234
#14 KWin::TabBox::TabBoxHandler::hide(bool) (abort=false, this=0x55c6f98ec160) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/tabboxhandler.cpp:424
#15 KWin::TabBox::TabBox::hide(bool) (this=this@entry=0x55c6f984f3f0, abort=abort@entry=false) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/tabbox.cpp:727
#16 0x00007fbee8629c17 in KWin::TabBox::TabBox::close(bool) (this=this@entry=0x55c6f984f3f0, abort=abort@entry=false) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/tabbox.cpp:1429
#17 0x00007fbee8629fab in KWin::TabBox::TabBox::accept(bool) (this=0x55c6f984f3f0, closeTabBox=<optimized out>) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/tabbox.cpp:1440
#18 0x00007fbee862a703 in KWin::TabBox::TabBox::modifiersReleased() (this=0x55c6f984f3f0) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/tabbox.cpp:1458
#19 0x00007fbee862f52f in KWin::TabBox::X11Filter::keyRelease(xcb_generic_event_t*) (this=<optimized out>, event=0x7fbed407e4c0) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/x11_filter.cpp:144
#20 KWin::TabBox::X11Filter::event(xcb_generic_event_t*) (this=<optimized out>, event=0x7fbed407e4c0) at /usr/src/debug/kwin/kwin-5.27.3/src/tabbox/x11_filter.cpp:62
#21 0x00007fbee844b204 in KWin::Application::dispatchEvent(xcb_generic_event_t*) (this=<optimized out>, event=0x7fbed407e4c0) at /usr/src/debug/kwin/kwin-5.27.3/src/main.cpp:483
#22 0x00007fbee6a8484f in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) (this=<optimized out>, eventType=..., message=message@entry=0x7fbed407e4c0, result=result@entry=0x7ffe4737e0a0) at kernel/qabstracteventdispatcher.cpp:495
#23 0x00007fbee1105f11 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) (this=this@entry=0x55c6f9354b70, event=event@entry=0x7fbed407e4c0) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:579
#24 0x00007fbee110a4c0 in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55c6f9354b70, flags=...) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:1063
#25 0x00007fbee112e8c8 in xcbSourceDispatch(GSource*, GSourceFunc, gpointer) (source=<optimized out>) at /usr/src/debug/qt5-base/qtbase/src/plugins/platforms/xcb/qxcbeventdispatcher.cpp:103
#26 0x00007fbee450f53b in g_main_dispatch (context=0x7fbedc000ee0) at ../glib/glib/gmain.c:3460
#27 g_main_context_dispatch (context=0x7fbedc000ee0) at ../glib/glib/gmain.c:4200
#28 0x00007fbee456c219 in g_main_context_iterate.constprop.0 (context=0x7fbedc000ee0, block=1, dispatch=1, self=<optimized out>) at ../glib/glib/gmain.c:4276
#29 0x00007fbee450e1a2 in g_main_context_iteration (context=0x7fbedc000ee0, may_block=1) at ../glib/glib/gmain.c:4343
#30 0x00007fbee6ad8c6c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55c6f944d4b0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#31 0x00007fbee6a866ec in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7ffe4737e430, flags=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:69
#32 0x00007fbee6a91219 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#33 0x00007fbee6f3a052 in QGuiApplication::exec() () at kernel/qguiapplication.cpp:1870
#34 0x00007fbee6176f2a in QApplication::exec() () at kernel/qapplication.cpp:2832
#35 0x000055c6f7a95f16 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kwin/kwin-5.27.3/src/main_x11.cpp:447