Bug 439660

Application: systemsettings5 (5.22.3)

Qt Version: 5.15.3
Frameworks Version: 5.83.0
Operating System: Linux 5.8.0-59-generic x86_64
Windowing System: Wayland
Drkonqi Version: 5.22.3
Distribution: KDE neon User Edition 5.22

-- Information about the crash:
- What I was doing when the application crashed:
I had a few processes with high cpu usage. I changed the Rendering backend to XRender in the Compositor settings and System Settings crashed. This happened twice, but does not happen every time I change the setting.
- Unusual behavior I noticed:
The whole desktop was unusually sluggish and unresponsive.

The crash can be reproduced sometimes.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault

[New LWP 82688]
[New LWP 82941]
[New LWP 82942]
[New LWP 82944]
[New LWP 82945]
[New LWP 83822]
[New LWP 83943]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f86f1f97aff in __GI___poll (fds=0x7ffc198636f8, nfds=1, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
[Current thread is 1 (Thread 0x7f86ed958600 (LWP 82604))]

Thread 8 (Thread 0x7f86b75ef700 (LWP 83943)):
#0  __GI___pthread_getspecific (key=4) at pthread_getspecific.c:31
#1  0x00007f86f00c1044 in g_thread_self () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f86f0097493 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f86f2564fcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f86b0000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f86f250925b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f86b75eecc0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f86f2322c22 in QThread::exec() (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x00007f86f13be559 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f86f2323dbc in QThreadPrivate::start(void*) (arg=0x55922ba00eb0) at thread/qthread_unix.cpp:329
#8  0x00007f86f0a56609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f86f1fa4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7f86c18fa700 (LWP 83822)):
#0  __GI___libc_read (nbytes=16, buf=0x7f86c18f9ab0, fd=20) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=20, buf=0x7f86c18f9ab0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f86f00dfb2f in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f86f0096ebe in g_main_context_check () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f86f0097312 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f86f00974a3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f86f2564fcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f86b8000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#7  0x00007f86f250925b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f86c18f9cc0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#8  0x00007f86f2322c22 in QThread::exec() (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#9  0x00007f86f13be559 in  () at /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f86f2323dbc in QThreadPrivate::start(void*) (arg=0x55922b6fa070) at thread/qthread_unix.cpp:329
#11 0x00007f86f0a56609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007f86f1fa4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7f86d2059700 (LWP 82945)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55922aff7a38) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55922aff79e8, cond=0x55922aff7a10) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55922aff7a10, mutex=0x55922aff79e8) at pthread_cond_wait.c:638
#3  0x00007f86dd65bb5b in  () at /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f86dd65b75b in  () at /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f86f0a56609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f86f1fa4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f86d285a700 (LWP 82944)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55922aff7a38) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55922aff79e8, cond=0x55922aff7a10) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55922aff7a10, mutex=0x55922aff79e8) at pthread_cond_wait.c:638
#3  0x00007f86dd65bb5b in  () at /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f86dd65b75b in  () at /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f86f0a56609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f86f1fa4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f86d305b700 (LWP 82942)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55922aff7a38) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55922aff79e8, cond=0x55922aff7a10) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55922aff7a10, mutex=0x55922aff79e8) at pthread_cond_wait.c:638
#3  0x00007f86dd65bb5b in  () at /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f86dd65b75b in  () at /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f86f0a56609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f86f1fa4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f86dcf02700 (LWP 82941)):
#0  futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55922aff7a38) at ../sysdeps/nptl/futex-internal.h:183
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55922aff79e8, cond=0x55922aff7a10) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55922aff7a10, mutex=0x55922aff79e8) at pthread_cond_wait.c:638
#3  0x00007f86dd65bb5b in  () at /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#4  0x00007f86dd65b75b in  () at /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
#5  0x00007f86f0a56609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f86f1fa4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f86dfe43700 (LWP 82688)):
#0  0x00007ffc199c9aa3 in clock_gettime ()
#1  0x00007f86f1f62235 in __GI___clock_gettime (clock_id=clock_id@entry=1, tp=tp@entry=0x7f86dfe42a20) at ../sysdeps/unix/sysv/linux/clock_gettime.c:38
#2  0x00007f86f2564895 in qt_clock_gettime (ts=0x7f86dfe42a20, clock=1) at kernel/qelapsedtimer_unix.cpp:175
#3  do_gettime (frac=<synthetic pointer>, sec=<synthetic pointer>) at kernel/qelapsedtimer_unix.cpp:166
#4  qt_gettime() () at kernel/qelapsedtimer_unix.cpp:175
#5  0x00007f86f256312d in QTimerInfoList::updateCurrentTime() (this=this@entry=0x7f86d8005130) at kernel/qtimerinfo_unix.cpp:91
#6  0x00007f86f2563709 in QTimerInfoList::timerWait(timespec&) (this=0x7f86d8005130, tm=...) at kernel/qtimerinfo_unix.cpp:388
#7  0x00007f86f2564d26 in timerSourcePrepareHelper (timeout=0x7f86dfe42ae4, src=<optimized out>) at kernel/qeventdispatcher_glib.cpp:162
#8  timerSourcePrepare(GSource*, gint*) (source=<optimized out>, timeout=0x7f86dfe42ae4) at kernel/qeventdispatcher_glib.cpp:166
#9  0x00007f86f00968ef in g_main_context_prepare () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f86f009729b in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f86f00974a3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f86f2564fcb in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7f86d8000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#13 0x00007f86f250925b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7f86dfe42cb0, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#14 0x00007f86f2322c22 in QThread::exec() (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#15 0x00007f86f0fd9f4b in  () at /usr/lib/x86_64-linux-gnu/libQt5DBus.so.5
#16 0x00007f86f2323dbc in QThreadPrivate::start(void*) (arg=0x7f86f105dd80) at thread/qthread_unix.cpp:329
#17 0x00007f86f0a56609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#18 0x00007f86f1fa4293 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f86ed958600 (LWP 82604)):
[KCrash Handler]
#4  0x000055922d02e230 in  ()
#5  0x00007f86efc78247 in QWaylandClientExtensionPrivate::handleRegistryGlobal(void*, wl_registry*, unsigned int, QString const&, unsigned int) (data=0x55922d026590, registry=0x55922af3d5d0, id=45, interface=..., version=1) at global/qwaylandclientextension.cpp:67
#6  0x00007f86efc538f2 in QtWaylandClient::QWaylandDisplay::registry_global(unsigned int, QString const&, unsigned int) (this=<optimized out>, id=45, interface=..., version=1) at qwaylanddisplay.cpp:397
#7  0x00007f86efc82996 in QtWayland::wl_registry::handle_global(void*, wl_registry*, unsigned int, char const*, unsigned int) (data=0x55922af3b7a0, object=<optimized out>, name=45, interface=0x55922bd3ffb0 "org_kde_kwin_blur_manager", version=1) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qarraydata.h:236
#8  0x00007f86edb26ff5 in ffi_call_unix64 () at ../src/x86/unix64.S:101
#9  0x00007f86edb2640a in ffi_call_int (cif=<optimized out>, fn=<optimized out>, rvalue=<optimized out>, avalue=<optimized out>, closure=<optimized out>) at ../src/x86/ffi64.c:669
#10 0x00007f86efbcd3a8 in wl_closure_invoke (closure=closure@entry=0x55922bd3fed0, flags=flags@entry=1, target=<optimized out>, target@entry=0x55922af3d5d0, opcode=opcode@entry=0, data=<optimized out>) at ../src/connection.c:1018
#11 0x00007f86efbc9c48 in dispatch_event (display=display@entry=0x55922af3f2e0, queue=<optimized out>) at ../src/wayland-client.c:1445
#12 0x00007f86efbcb21c in dispatch_queue (queue=0x55922af3f3b0, display=0x55922af3f2e0) at ../src/wayland-client.c:1591
#13 wl_display_dispatch_queue_pending (display=0x55922af3f2e0, queue=0x55922af3f3b0) at ../src/wayland-client.c:1833
#14 0x00007f86efbcb280 in wl_display_dispatch_pending (display=<optimized out>) at ../src/wayland-client.c:1896
#15 0x00007f86efc53235 in QtWaylandClient::QWaylandDisplay::flushRequests() (this=0x55922af3b790) at qwaylanddisplay.cpp:222
#16 0x00007f86f25417b0 in doActivate<false>(QObject*, int, void**) (sender=0x55922afbb640, signal_index=3, argv=0x7ffc19864920) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:395
#17 0x00007f86f253ab47 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) (sender=sender@entry=0x55922afbb640, m=m@entry=0x7f86f27a6b40 <QSocketNotifier::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffc19864920) at kernel/qobject.cpp:3946
#18 0x00007f86f2545803 in QSocketNotifier::activated(QSocketDescriptor, QSocketNotifier::Type, QSocketNotifier::QPrivateSignal) (this=this@entry=0x55922afbb640, _t1=..., _t2=<optimized out>, _t3=...) at .moc/moc_qsocketnotifier.cpp:178
#19 0x00007f86f2545fa3 in QSocketNotifier::event(QEvent*) (this=0x55922afbb640, e=0x7ffc19864bf0) at kernel/qsocketnotifier.cpp:302
#20 0x00007f86f310fdc3 in QApplicationPrivate::notify_helper(QObject*, QEvent*) (this=this@entry=0x55922af388b0, receiver=receiver@entry=0x55922afbb640, e=e@entry=0x7ffc19864bf0) at kernel/qapplication.cpp:3632
#21 0x00007f86f3118bb8 in QApplication::notify(QObject*, QEvent*) (this=0x7ffc19864f20, receiver=0x55922afbb640, e=0x7ffc19864bf0) at kernel/qapplication.cpp:3156
#22 0x00007f86f250a75a in QCoreApplication::notifyInternal2(QObject*, QEvent*) (receiver=0x55922afbb640, event=0x7ffc19864bf0) at ../../include/QtCore/5.15.3/QtCore/private/../../../../../src/corelib/thread/qthread_p.h:325
#23 0x00007f86f2565bb5 in socketNotifierSourceDispatch(GSource*, GSourceFunc, gpointer) (source=0x55922af6f9f0) at kernel/qeventdispatcher_glib.cpp:107
#24 0x00007f86f009717d in g_main_context_dispatch () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f86f0097400 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f86f00974a3 in g_main_context_iteration () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f86f2564fb2 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x55922afbb160, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#28 0x00007f86f250925b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=this@entry=0x7ffc19864e00, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#29 0x00007f86f2511414 in QCoreApplication::exec() () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#30 0x000055922a5dc272 in main(int, char**) (argc=<optimized out>, argv=<optimized out>) at ./app/main.cpp:208
[Inferior 1 (process 82604) detached]

Possible duplicates by query: bug 439320, bug 439249, bug 439232, bug 439199, bug 439139.

Reported using DrKonqi