Application: systemsettings (5.23.80)

Qt Version: 5.15.3
Frameworks Version: 5.90.0
Operating System: Linux 5.11.0-40-generic x86_64
Windowing System: Wayland
Distribution: KDE neon Unstable Edition
DrKonqi: 5.23.80 [CoredumpBackend]

-- Information about the crash:
- What I was doing when the application crashed:
On Wayland, open Display Configuration KCM, change display scale, click on 'Apply' button (a dialog to keep/revert the change shows up), wait the countdown to finish. Display configuration is reverted as expected but System Settings crashes.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings), signal: Segmentation fault
Content of s_kcrashErrorMessage: std::unique_ptr<char []> = {get() = 0x0}
[New LWP 26434]
[New LWP 28096]
[New LWP 26437]
[New LWP 26440]
[New LWP 28199]
[New LWP 26439]
[New LWP 26441]
[New LWP 26442]
[New LWP 28092]
[New LWP 28093]
[New LWP 28450]
[New LWP 26438]
[New LWP 28094]
[New LWP 26436]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/bin/systemsettings kcm_kwin_effects'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __GI_raise (sig=sig@entry=11) at ../sysdeps/unix/sysv/linux/raise.c:50
[Current thread is 1 (Thread 0x7f95f72e89c0 (LWP 26434))]
__preamble__

[Current thread is 1 (Thread 0x7f95f72e89c0 (LWP 26434))]

Thread 14 (Thread 0x7f95f64f4700 (LWP 26436)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x7f95f0019f60, nfds=4, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=4, fds=0x7f95f0019f60, timeout=<optimized out>, context=0x7f95f0000c20) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x7f95f0000c20, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa4a3 in g_main_context_iteration (context=0x7f95f0000c20, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f95fc179602 in QEventDispatcherGlib::processEvents (this=0x7f95f0000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f95fc11d8ab in QEventLoop::exec (this=this@entry=0x7f95f64f3bb0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#6  0x00007f95fbf372c2 in QThread::exec (this=this@entry=0x7f95fb312d80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007f95fb28ef4b in QDBusConnectionManager::run (this=0x7f95fb312d80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:179
#8  0x00007f95fbf3845c in QThreadPrivate::start (arg=0x7f95fb312d80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at thread/qthread_unix.cpp:329
#9  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7f95cd097700 (LWP 28094)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x7f95b8016c00, nfds=3, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=3, fds=0x7f95b8016c00, timeout=<optimized out>, context=0x7f95b8013e60) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=0x7f95b8013e60, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa6f3 in g_main_loop_run (loop=0x7f95b8013f50) at ../../../glib/gmain.c:4241
#4  0x00007f95ce3bef8a in gdbus_shared_thread_func (user_data=0x7f95b8013e30) at ../../../gio/gdbusprivate.c:279
#5  0x00007f95f9c23ad1 in g_thread_proxy (data=0x7f95b8002f00) at ../../../glib/gthread.c:807
#6  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7f95ef6bd700 (LWP 26438)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55687d765b48) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55687d765af8, cond=0x55687d765b20) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55687d765b20, mutex=0x55687d765af8) at pthread_cond_wait.c:647
#3  0x00007f95f42feb1b in cnd_wait (mtx=0x55687d765af8, cond=0x55687d765b20) at ../include/c11/threads_posix.h:155
#4  util_queue_thread_func (input=input@entry=0x55687d5b2e50) at ../src/util/u_queue.c:294
#5  0x00007f95f42fe71b in impl_thrd_routine (p=<optimized out>) at ../include/c11/threads_posix.h:87
#6  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7f95b5481700 (LWP 28450)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x7f95a40032d0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f95a40032d0, timeout=<optimized out>, context=0x7f95a4003300) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x7f95a4003300, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa4a3 in g_main_context_iteration (context=0x7f95a4003300, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f95fc179602 in QEventDispatcherGlib::processEvents (this=0x7f95a40038c0, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f95fc11d8ab in QEventLoop::exec (this=this@entry=0x7f95b5480bc0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#6  0x00007f95fbf372c2 in QThread::exec (this=this@entry=0x5568823dc570) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007f95fab94549 in QQmlThreadPrivate::run (this=0x5568823dc570) at qml/ftw/qqmlthread.cpp:155
#8  0x00007f95fbf3845c in QThreadPrivate::start (arg=0x5568823dc570) at thread/qthread_unix.cpp:329
#9  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7f95cd898700 (LWP 28093)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x55688430b810, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x55688430b810, timeout=<optimized out>, context=0x55688430b750) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x55688430b750, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa4a3 in g_main_context_iteration (context=context@entry=0x55688430b750, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f95d400e99d in dconf_gdbus_worker_thread (user_data=0x55688430b750) at ../gdbus/dconf-gdbus-thread.c:82
#5  0x00007f95f9c23ad1 in g_thread_proxy (data=0x7f95c8001800) at ../../../glib/gthread.c:807
#6  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7f95ce099700 (LWP 28092)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x7f95c0000b60, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f95c0000b60, timeout=<optimized out>, context=0x55687e152cd0) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x55687e152cd0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa4a3 in g_main_context_iteration (context=0x55687e152cd0, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f95f9bfa4f1 in glib_worker_main (data=<optimized out>) at ../../../glib/gmain.c:5996
#5  0x00007f95f9c23ad1 in g_thread_proxy (data=0x55687d558ea0) at ../../../glib/gthread.c:807
#6  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7f95d7fff700 (LWP 26442)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x7f95d0004a60, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f95d0004a60, timeout=<optimized out>, context=0x7f95d0000c20) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x7f95d0000c20, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa4a3 in g_main_context_iteration (context=0x7f95d0000c20, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f95fc179602 in QEventDispatcherGlib::processEvents (this=0x7f95d0000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f95fc11d8ab in QEventLoop::exec (this=this@entry=0x7f95d7ffebc0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#6  0x00007f95fbf372c2 in QThread::exec (this=this@entry=0x55687d8952f0) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007f95fab94549 in QQmlThreadPrivate::run (this=0x55687d8952f0) at qml/ftw/qqmlthread.cpp:155
#8  0x00007f95fbf3845c in QThreadPrivate::start (arg=0x55687d8952f0) at thread/qthread_unix.cpp:329
#9  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f95ed90e700 (LWP 26441)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x7f95dc004e60, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f95dc004e60, timeout=<optimized out>, context=0x7f95dc000c20) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x7f95dc000c20, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa4a3 in g_main_context_iteration (context=0x7f95dc000c20, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f95fc179602 in QEventDispatcherGlib::processEvents (this=0x7f95dc000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f95fc11d8ab in QEventLoop::exec (this=this@entry=0x7f95ed90dbc0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#6  0x00007f95fbf372c2 in QThread::exec (this=this@entry=0x55687d86c3f0) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007f95fab94549 in QQmlThreadPrivate::run (this=0x55687d86c3f0) at qml/ftw/qqmlthread.cpp:155
#8  0x00007f95fbf3845c in QThreadPrivate::start (arg=0x55687d86c3f0) at thread/qthread_unix.cpp:329
#9  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f95eeebc700 (LWP 26439)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55687d765b48) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55687d765af8, cond=0x55687d765b20) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55687d765b20, mutex=0x55687d765af8) at pthread_cond_wait.c:647
#3  0x00007f95f42feb1b in cnd_wait (mtx=0x55687d765af8, cond=0x55687d765b20) at ../include/c11/threads_posix.h:155
#4  util_queue_thread_func (input=input@entry=0x55687d5b3c80) at ../src/util/u_queue.c:294
#5  0x00007f95f42fe71b in impl_thrd_routine (p=<optimized out>) at ../include/c11/threads_posix.h:87
#6  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f95c75a6700 (LWP 28199)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x7f95b01630d0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f95b01630d0, timeout=<optimized out>, context=0x7f95b0458800) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x7f95b0458800, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa4a3 in g_main_context_iteration (context=0x7f95b0458800, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f95fc179602 in QEventDispatcherGlib::processEvents (this=0x7f95b01fb080, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f95fc11d8ab in QEventLoop::exec (this=this@entry=0x7f95c75a5be0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#6  0x00007f95fbf372c2 in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007f95fbf3845c in QThreadPrivate::start (arg=0x55687e65f3c0) at thread/qthread_unix.cpp:329
#8  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f95ee6bb700 (LWP 26440)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55687d765b4c) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55687d765af8, cond=0x55687d765b20) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55687d765b20, mutex=0x55687d765af8) at pthread_cond_wait.c:647
#3  0x00007f95f42feb1b in cnd_wait (mtx=0x55687d765af8, cond=0x55687d765b20) at ../include/c11/threads_posix.h:155
#4  util_queue_thread_func (input=input@entry=0x55687d61d790) at ../src/util/u_queue.c:294
#5  0x00007f95f42fe71b in impl_thrd_routine (p=<optimized out>) at ../include/c11/threads_posix.h:87
#6  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f95efebe700 (LWP 26437)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55687d765b48) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55687d765af8, cond=0x55687d765b20) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55687d765b20, mutex=0x55687d765af8) at pthread_cond_wait.c:647
#3  0x00007f95f42feb1b in cnd_wait (mtx=0x55687d765af8, cond=0x55687d765b20) at ../include/c11/threads_posix.h:155
#4  util_queue_thread_func (input=input@entry=0x55687d5e6220) at ../src/util/u_queue.c:294
#5  0x00007f95f42fe71b in impl_thrd_routine (p=<optimized out>) at ../include/c11/threads_posix.h:87
#6  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f95d6dbe700 (LWP 28096)):
#0  0x00007f95fbba9aff in __GI___poll (fds=0x7f95c809ba40, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f95f9bfa36e in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f95c809ba40, timeout=<optimized out>, context=0x7f95c80f9720) at ../../../glib/gmain.c:4346
#2  g_main_context_iterate (context=context@entry=0x7f95c80f9720, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4042
#3  0x00007f95f9bfa4a3 in g_main_context_iteration (context=0x7f95c80f9720, may_block=may_block@entry=1) at ../../../glib/gmain.c:4108
#4  0x00007f95fc179602 in QEventDispatcherGlib::processEvents (this=0x7f95c81cb520, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#5  0x00007f95fc11d8ab in QEventLoop::exec (this=this@entry=0x7f95d6dbdba0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#6  0x00007f95fbf372c2 in QThread::exec (this=this@entry=0x55687d7cbec0) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007f95d4ac607c in KCupsConnection::run (this=0x55687d7cbec0) at ./libkcups/KCupsConnection.cpp:289
#8  0x00007f95fbf3845c in QThreadPrivate::start (arg=0x55687d7cbec0) at thread/qthread_unix.cpp:329
#9  0x00007f95fa5b8609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007f95fbbb6293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f95f72e89c0 (LWP 26434)):
[KCrash Handler]
#3  QSharedPointer<KScreen::Screen>::operator-> (this=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qsharedpointer_impl.h:307
#4  KScreen::Config::clone (this=0x0) at ./src/config.cpp:205
#5  0x00007f95c4352bbc in ConfigHandler::revertConfig (this=0x5568826ff100) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qsharedpointer_impl.h:307
#6  KCMKScreen::revertSettings (this=0x55688a2b2630) at ./kcm/kcm.cpp:93
#7  0x00007f95c4342ddc in KCMKScreen::qt_static_metacall (_o=_o@entry=0x55688a2b2630, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=22, _a=_a@entry=0x7fffb3b96e20) at ./obj-x86_64-linux-gnu/kcm/kcm_kscreen_autogen/EWIEGA46WW/moc_kcm.cpp:231
#8  0x00007f95c4343b63 in KCMKScreen::qt_metacall (this=0x55688a2b2630, _c=QMetaObject::InvokeMetaMethod, _id=22, _a=0x7fffb3b96e20) at ./obj-x86_64-linux-gnu/kcm/kcm_kscreen_autogen/EWIEGA46WW/moc_kcm.cpp:435
#9  0x00007f95fab27bf5 in QQmlObjectOrGadget::metacall (this=this@entry=0x7fffb3b97110, type=type@entry=QMetaObject::InvokeMetaMethod, index=<optimized out>, index@entry=55, argv=argv@entry=0x7fffb3b96e20) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/ftw/qflagpointer_p.h:351
#10 0x00007f95fa9f0b34 in CallMethod (object=..., index=55, returnType=returnType@entry=43, argCount=argCount@entry=0, argTypes=argTypes@entry=0x0, engine=engine@entry=0x55688affdc00, callArgs=0x7f95b40417b8, callType=QMetaObject::InvokeMetaMethod) at jsruntime/qv4qobjectwrapper.cpp:1319
#11 0x00007f95fa9f27a4 in CallPrecise (object=..., data=..., engine=engine@entry=0x55688affdc00, callArgs=callArgs@entry=0x7f95b40417b8, callType=callType@entry=QMetaObject::InvokeMetaMethod) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/qqmlpropertydata_p.h:285
#12 0x00007f95fa9f375a in QV4::QObjectMethod::callInternal (this=<optimized out>, thisObject=<optimized out>, argv=<optimized out>, argc=0) at jsruntime/qv4qobjectwrapper.cpp:2131
#13 0x00007f95faa131e1 in QV4::FunctionObject::call (argc=<optimized out>, argv=<optimized out>, thisObject=<optimized out>, this=<optimized out>) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/jsruntime/qv4functionobject_p.h:172
#14 QV4::Moth::VME::interpret (frame=0x7fffb3b97400, engine=0x55688affdc00, code=0x7f95b4041768 "\240\341\306\243\225\177") at jsruntime/qv4vme_moth.cpp:754
#15 0x00007f95faa1511f in QV4::Moth::VME::exec (frame=frame@entry=0x7fffb3b97400, engine=engine@entry=0x55688affdc00) at jsruntime/qv4vme_moth.cpp:463
#16 0x00007f95fa9a22fd in QV4::Function::call (this=this@entry=0x55687d9574d0, thisObject=<optimized out>, argv=argv@entry=0x7f95b4041730, argc=<optimized out>, context=<optimized out>) at jsruntime/qv4function.cpp:69
#17 0x00007f95fab47fb7 in QQmlJavaScriptExpression::evaluate (this=this@entry=0x556881dabc00, callData=callData@entry=0x7f95b4041700, isUndefined=isUndefined@entry=0x0) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/jsruntime/qv4value_p.h:343
#18 0x00007f95faaeb8be in QQmlBoundSignalExpression::evaluate (this=<optimized out>, a=<optimized out>) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/jsruntime/qv4jscall_p.h:95
#19 0x00007f95faaec958 in QQmlBoundSignal_callback (e=0x556882a3a7c0, a=0x0) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/qqmlboundsignalexpressionpointer_p.h:69
#20 0x00007f95fab2765d in QQmlNotifier::emitNotify (endpoint=<optimized out>, a=a@entry=0x0) at qml/qqmlnotifier.cpp:104
#21 0x00007f95faac9fcf in QQmlData::signalEmitted (object=0x55687e5368a0, index=4, a=0x0) at qml/qqmlengine.cpp:834
#22 0x00007f95fc155955 in doActivate<false> (sender=0x55687e5368a0, signal_index=4, argv=0x0) at kernel/qobject_p.h:110
#23 0x00007f95faac47aa in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/qqmlpropertycache_p.h:376
#24 0x00007f95faac3d94 in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/ftw/qflagpointer_p.h:351
#25 0x00007f95faac3d94 in QQmlVMEMetaObject::metaCall(QObject*, QMetaObject::Call, int, void**) () at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/ftw/qflagpointer_p.h:351
#26 0x00007f95faad6d63 in QQmlPropertyData::writeProperty (flags=..., value=<optimized out>, target=0x55687e5368a0, this=0x7f95a408c928) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/qqmlpropertydata_p.h:379
#27 QQmlPropertyPrivate::write (object=object@entry=0x55687e5368a0, property=..., value=..., context=<optimized out>, flags=..., flags@entry=...) at qml/qqmlproperty.cpp:1246
#28 0x00007f95fa9f478c in QV4::QObjectWrapper::setProperty (engine=engine@entry=0x55688affdc00, object=object@entry=0x55687e5368a0, property=0x7f95a408c928, value=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qflags.h:120
#29 0x00007f95fa9f52be in QV4::QObjectWrapper::setQmlProperty (value=..., revisionMode=QV4::QObjectWrapper::IgnoreRevision, name=<optimized out>, object=0x55687e5368a0, qmlContext=<optimized out>, engine=0x55688affdc00) at jsruntime/qv4qobjectwrapper.cpp:435
#30 QV4::QObjectWrapper::setQmlProperty (engine=0x55688affdc00, qmlContext=<optimized out>, object=0x55687e5368a0, name=<optimized out>, revisionMode=QV4::QObjectWrapper::IgnoreRevision, value=...) at jsruntime/qv4qobjectwrapper.cpp:418
#31 0x00007f95fa9f5437 in QV4::QObjectWrapper::virtualPut (m=0x7f95b40416a8, id=..., value=..., receiver=0x7f95b40416a8) at /usr/include/c++/9/bits/atomic_base.h:413
#32 0x00007f95fa9b8164 in QV4::Object::put (receiver=0x7f95b40416a8, v=..., id=..., this=0x7f95b40416a8) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/memory/qv4heap_p.h:73
#33 QV4::Object::virtualResolveLookupSetter (object=0x7f95b40416a8, engine=0x55688affdc00, lookup=0x5568821cb850, value=...) at jsruntime/qv4object.cpp:804
#34 0x00007f95faa0fcf6 in QV4::Moth::VME::interpret (frame=0x7fffb3b998d0, engine=0x55688affdc00, code=0x7f95c432144e <error: Cannot access memory at address 0x7f95c432144e>) at jsruntime/qv4vme_moth.cpp:653
#35 0x00007f95faa1511f in QV4::Moth::VME::exec (frame=frame@entry=0x7fffb3b998d0, engine=engine@entry=0x55688affdc00) at jsruntime/qv4vme_moth.cpp:463
#36 0x00007f95fa9a2fc8 in QV4::ArrowFunction::virtualCall (fo=<optimized out>, thisObject=<optimized out>, argv=<optimized out>, argc=<optimized out>) at jsruntime/qv4functionobject.cpp:528
#37 0x00007f95faa131e1 in QV4::FunctionObject::call (argc=<optimized out>, argv=<optimized out>, thisObject=<optimized out>, this=<optimized out>) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/jsruntime/qv4functionobject_p.h:172
#38 QV4::Moth::VME::interpret (frame=0x7fffb3b99b00, engine=0x55688affdc00, code=0x7f95b4041628 "\300>\305\243\225\177") at jsruntime/qv4vme_moth.cpp:754
#39 0x00007f95faa1511f in QV4::Moth::VME::exec (frame=frame@entry=0x7fffb3b99b00, engine=engine@entry=0x55688affdc00) at jsruntime/qv4vme_moth.cpp:463
#40 0x00007f95fa9a22fd in QV4::Function::call (this=this@entry=0x55688a74efe0, thisObject=<optimized out>, argv=argv@entry=0x7f95b40415f0, argc=<optimized out>, context=<optimized out>) at jsruntime/qv4function.cpp:69
#41 0x00007f95fab47fb7 in QQmlJavaScriptExpression::evaluate (this=this@entry=0x55687e2fdb90, callData=callData@entry=0x7f95b40415c0, isUndefined=isUndefined@entry=0x0) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/jsruntime/qv4value_p.h:343
#42 0x00007f95faaeb8be in QQmlBoundSignalExpression::evaluate (this=<optimized out>, a=<optimized out>) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/jsruntime/qv4jscall_p.h:95
#43 0x00007f95faaec958 in QQmlBoundSignal_callback (e=0x55687e2fdb40, a=0x0) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/qqmlboundsignalexpressionpointer_p.h:69
#44 0x00007f95fab2765d in QQmlNotifier::emitNotify (endpoint=<optimized out>, a=a@entry=0x0) at qml/qqmlnotifier.cpp:104
#45 0x00007f95faac9fcf in QQmlData::signalEmitted (object=0x55688a2b2630, index=35, a=0x0) at qml/qqmlengine.cpp:834
#46 0x00007f95fc155955 in doActivate<false> (sender=0x55688a2b2630, signal_index=35, argv=0x0) at kernel/qobject_p.h:110
#47 0x00007f95fc14f197 in QMetaObject::activate (sender=sender@entry=0x55688a2b2630, m=m@entry=0x7f95c43809e0 <KCMKScreen::staticMetaObject>, local_signal_index=local_signal_index@entry=17, argv=argv@entry=0x0) at kernel/qobject.cpp:3946
#48 0x00007f95c4342607 in KCMKScreen::settingsReverted (this=this@entry=0x55688a2b2630) at ./obj-x86_64-linux-gnu/kcm/kcm_kscreen_autogen/EWIEGA46WW/moc_kcm.cpp:568
#49 0x00007f95c4352c46 in KCMKScreen::revertSettings (this=0x55688a2b2630) at ./kcm/kcm.cpp:97
#50 0x00007f95c4342ddc in KCMKScreen::qt_static_metacall (_o=_o@entry=0x55688a2b2630, _c=_c@entry=QMetaObject::InvokeMetaMethod, _id=_id@entry=22, _a=_a@entry=0x7fffb3b9ba20) at ./obj-x86_64-linux-gnu/kcm/kcm_kscreen_autogen/EWIEGA46WW/moc_kcm.cpp:231
#51 0x00007f95c4343b63 in KCMKScreen::qt_metacall (this=0x55688a2b2630, _c=QMetaObject::InvokeMetaMethod, _id=22, _a=0x7fffb3b9ba20) at ./obj-x86_64-linux-gnu/kcm/kcm_kscreen_autogen/EWIEGA46WW/moc_kcm.cpp:435
#52 0x00007f95fab27bf5 in QQmlObjectOrGadget::metacall (this=this@entry=0x7fffb3b9bd10, type=type@entry=QMetaObject::InvokeMetaMethod, index=<optimized out>, index@entry=55, argv=argv@entry=0x7fffb3b9ba20) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/ftw/qflagpointer_p.h:351
#53 0x00007f95fa9f0b34 in CallMethod (object=..., index=55, returnType=returnType@entry=43, argCount=argCount@entry=0, argTypes=argTypes@entry=0x0, engine=engine@entry=0x55688affdc00, callArgs=0x7f95b4041588, callType=QMetaObject::InvokeMetaMethod) at jsruntime/qv4qobjectwrapper.cpp:1319
#54 0x00007f95fa9f27a4 in CallPrecise (object=..., data=..., engine=engine@entry=0x55688affdc00, callArgs=callArgs@entry=0x7f95b4041588, callType=callType@entry=QMetaObject::InvokeMetaMethod) at ../../include/QtQml/5.15.3/QtQml/private/../../../../../src/qml/qml/qqmlpropertydata_p.h:285
#55 0x00007f95fa9f375a in QV4::QObjectMethod::callInternal (this=<optimized out>, thisObject=<optimized out>, argv=<optimized out>, argc=0) at jsruntime/qv4qobjectwrapper.cpp:2131
#56 0x00007f95faa2391b in QV4::Runtime::CallPropertyLookup::call(QV4::ExecutionEngine*, QV4::Value const&, unsigned int, QV4::Value*, int) () at jsruntime/qv4functionobject_p.h:172
#57 0x00007f95cfacb26c in ?? ()
#58 0x0000000000000000 in ?? ()

Reported using DrKonqi