https://bugs.kde.org/show_bug.cgi?id=442822
Bug ID: 442822
Summary: intermittent kded5 crash
Product: KScreen
Version: 5.22.4
Platform: Kubuntu Packages
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: rmur...@cyberhqz.com
Target Milestone: ---
SUMMARY
kded5
STEPS TO REPRODUCE
1. KSCREEN_BACKEND=qscreen exported via .config/plasma-workspace/env/kscreen.sh
2. NVIDIA driver with 3 displays configured as: Option "metamodes"
"DP-0: nvidia-auto-select +2160+1240, DP-4: nvidia-auto-select +6000+1422
{AllowGSYNCCompatible=On}, DP-2: nvidia-auto-select +0+0 {rotation=left}" DP-0
is 144hz, the other two are 60hz, one of which is rotated left.
3. have option "nvidiaXineramaInfoOrder" "DFP-1" in the X config
OBSERVED RESULT
I get intermittent groupings of this crash when DFP-1 is listed first in
XineramaInfoOrder. It goes away if set to DFP-5 (the non-rotated 60hz).
However, that config causes fullscreen games to want to render at 144hz to the
60hz display.
Application: kded5 (kded5), signal: Segmentation fault
Content of s_kcrashErrorMessage: [Current thread is 1 (LWP 30030)]
[KCrash Handler]
#6 QString::QString(QString const&) (other=Python Exception <class
'gdb.MemoryError'> Cannot access memory at address 0x10:
#7 KScreen::Mode::id() const (this=this@entry=0x0) at ./src/mode.cpp:57
#8 0x00007f0c542e2597 in Generator::cloneScreens(QMap<int,
QSharedPointer<KScreen::Output> >&) (this=this@entry=0x55cbc8022410,
connectedOutputs=...) at ./kded/generator.cpp:323
#9 0x00007f0c542e3f4e in
Generator::fallbackIfNeeded(QSharedPointer<KScreen::Config> const&)
(this=0x55cbc8022410, config=...) at ./kded/generator.cpp:135
#10 0x00007f0c542d7e80 in
Generator::idealConfig(QSharedPointer<KScreen::Config> const&)
(currentConfig=<optimized out>, currentConfig=<optimized out>, this=<optimized
out>) at ./kded/generator.cpp:115
#11 KScreenDaemon::applyIdealConfig() (this=<optimized out>) at
./kded/daemon.cpp:297
#12 0x00007f0c542dbe77 in KScreenDaemon::applyConfig() (this=<optimized out>)
at ./kded/daemon.cpp:219
#13 0x00007f0c542dc160 in operator() (__closure=0x55cbc7bc8bf0) at
./kded/daemon.cpp:125
#14 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void,
KScreenDaemon::init()::<lambda()> >::call (arg=<optimized out>, f=...) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:146
#15 QtPrivate::Functor<KScreenDaemon::init()::<lambda()>,
0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:256
#16 QtPrivate::QFunctorSlotObject<KScreenDaemon::init()::<lambda()>, 0,
QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *,
void **, bool *) (which=<optimized out>, this_=0x55cbc7bc8be0, r=<optimized
out>, a=<optimized out>, ret=<optimized out>) at
/usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:443
#17 0x00007f0c6398e5c7 in QtPrivate::QSlotObjectBase::call(QObject*, void**)
(a=0x7ffc7ee14b40, r=0x55cbc7ed6e20, this=0x55cbc7bc8be0) at
../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#18 doActivate<false>(QObject*, int, void**) (sender=0x55cbc8022410,
signal_index=3, argv=0x7ffc7ee14b40) at kernel/qobject.cpp:3886
#19 0x00007f0c6398e5c7 in QtPrivate::QSlotObjectBase::call(QObject*, void**)
(a=0x7ffc7ee14c20, r=0x55cbc8022410, this=0x55cbc8143170) at
../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#20 doActivate<false>(QObject*, int, void**) (sender=0x55cbc8107cd0,
signal_index=3, argv=0x7ffc7ee14c20, argv@entry=0x0) at kernel/qobject.cpp:3886
#21 0x00007f0c63987728 in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) (sender=sender@entry=0x55cbc8107cd0, m=<optimized out>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at
kernel/qobject.cpp:3946
#22 0x00007f0c542e5f91 in Device::ready() (this=0x55cbc8107cd0) at
./obj-x86_64-linux-gnu/kded/kscreen_autogen/EWIEGA46WW/moc_device.cpp:186
#23 Device::setReady() (this=0x55cbc8107cd0) at ./kded/device.cpp:97
#24 Device::isLaptopFetched(QDBusPendingCallWatcher*) (this=0x55cbc8107cd0,
watcher=0x55cbc7f37bd0) at ./kded/device.cpp:139
#25 0x00007f0c6398e5c7 in QtPrivate::QSlotObjectBase::call(QObject*, void**)
(a=0x7ffc7ee14e10, r=0x55cbc8107cd0, this=0x55cbc80d2b60) at
../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:398
#26 doActivate<false>(QObject*, int, void**) (sender=0x55cbc7f37bd0,
signal_index=3, argv=argv@entry=0x7ffc7ee14e10) at kernel/qobject.cpp:3886
#27 0x00007f0c63987728 in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) (sender=<optimized out>, m=m@entry=0x7f0c63d2f5e0
<QDBusPendingCallWatcher::staticMetaObject>,
local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7ffc7ee14e10)
at kernel/qobject.cpp:3946
#28 0x00007f0c63d0ff73 in
QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) (this=<optimized
out>, _t1=<optimized out>) at .moc/moc_qdbuspendingcall.cpp:158
#29 0x00007f0c6398410c in QObject::event(QEvent*) (this=0x55cbc7f37bd0,
e=0x55cbc80d54d0) at kernel/qobject.cpp:1314
#30 0x00007f0c64696783 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
(this=<optimized out>, receiver=0x55cbc7f37bd0, e=0x55cbc80d54d0) at
kernel/qapplication.cpp:3632
#31 0x00007f0c639567ba in QCoreApplication::notifyInternal2(QObject*, QEvent*)
(receiver=0x55cbc7f37bd0, event=0x55cbc80d54d0) at
kernel/qcoreapplication.cpp:1063
#32 0x00007f0c639597e1 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) (receiver=0x0, event_type=0, data=0x55cbc7a3e6f0) at
kernel/qcoreapplication.cpp:1817
#33 0x00007f0c639b0ba7 in postEventSourceDispatch(GSource*, GSourceFunc,
gpointer) (s=0x55cbc7bf67a0) at kernel/qeventdispatcher_glib.cpp:277
#34 0x00007f0c6255e8eb in g_main_dispatch (context=0x7f0c58005000) at
../../../glib/gmain.c:3337
#35 g_main_context_dispatch (context=0x7f0c58005000) at
../../../glib/gmain.c:4055
#36 0x00007f0c625b1d28 in g_main_context_iterate.constprop.0
(context=context@entry=0x7f0c58005000, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>) at ../../../glib/gmain.c:4131
#37 0x00007f0c6255c023 in g_main_context_iteration (context=0x7f0c58005000,
may_block=may_block@entry=1) at ../../../glib/gmain.c:4196
#38 0x00007f0c639b0204 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x55cbc7c0c430, flags=...) at kernel/qeventdispatcher_glib.cpp:423
#39 0x00007f0c6395511b in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
(this=this@entry=0x7ffc7ee151e0, flags=..., flags@entry=...) at
../../include/QtCore/../../src/corelib/global/qflags.h:69
#40 0x00007f0c6395d604 in QCoreApplication::exec() () at
../../include/QtCore/../../src/corelib/global/qflags.h:121
#41 0x00007f0c63ed4520 in QGuiApplication::exec() () at
kernel/qguiapplication.cpp:1867
#42 0x00007f0c646966f9 in QApplication::exec() () at
kernel/qapplication.cpp:2824
#43 0x000055cbc5ab1ede in main(int, char**) (argc=<optimized out>,
argv=<optimized out>) at ./src/kded.cpp:782
[Inferior 1 (process 30030) detached]
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.04, w/ kubuntu-ppa backports
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
I switched to the qscreen backend years ago when I was using the nvidia driver
to scale on 2 4x3 monitors to line up with a 4k display. Otherwise, the rw
nature of the default backend would cause any unsupported features from the X
config (like scaling at the time, and rotation until the recent changes) to be
lost on the first write.
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