https://bugs.kde.org/show_bug.cgi?id=413892
--- Comment #6 from Méven Car <meve...@gmail.com> --- Copying better stack trace from duplicate https://bugs.kde.org/show_bug.cgi?id=417864: Thread 1 (Thread 0x7f6411926800 (LWP 7501)): [KCrash Handler] #6 0x00007f63ffd89564 in KWayland::Client::OutputDevice::enabled (this=0x560bc9a8fd30) at ./src/client/outputdevice.cpp:535 #7 0x00007f63d3df5566 in KScreen::WaylandOutput::updateKScreenOutput (this=this@entry=0x560bd9240f00, output=...) at ./backends/kwayland/waylandoutput.cpp:102 #8 0x00007f63d3df67fc in KScreen::WaylandOutput::toKScreenOutput (this=0x560bd9240f00) at ./backends/kwayland/waylandoutput.cpp:94 #9 0x00007f63d3dede0e in KScreen::WaylandConfig::currentConfig (this=0x560bd91bbfe0) at ./backends/kwayland/waylandconfig.cpp:294 #10 0x00007f63d3debcb3 in KScreen::WaylandBackend::<lambda()>::operator() (__closure=<optimized out>) at ./backends/kwayland/waylandbackend.cpp:45 #11 QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KScreen::WaylandBackend::WaylandBackend()::<lambda()> >::call (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:146 #12 QtPrivate::Functor<KScreen::WaylandBackend::WaylandBackend()::<lambda()>, 0>::call<QtPrivate::List<>, void> (arg=<optimized out>, f=...) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:256 #13 QtPrivate::QFunctorSlotObject<KScreen::WaylandBackend::WaylandBackend()::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=1, this_=<optimized out>, r=<optimized out>, a=<optimized out>, ret=<optimized out>) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:439 #14 0x00007f640d79391f in QtPrivate::QSlotObjectBase::call (a=0x7fff51f2c8c0, r=0x560bd926d010, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:394 #15 QMetaObject::activate (sender=sender@entry=0x560bd91bbfe0, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=0, argv=<optimized out>, argv@entry=0x0) at kernel/qobject.cpp:3789 #16 0x00007f640d793ec7 in QMetaObject::activate (sender=sender@entry=0x560bd91bbfe0, m=m@entry=0x7f63d3ffec80 <KScreen::WaylandConfig::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x0) at kernel/qobject.cpp:3660 #17 0x00007f63d3dfb050 in KScreen::WaylandConfig::configChanged (this=this@entry=0x560bd91bbfe0) at ./obj-x86_64-linux-gnu/backends/kwayland/KSC_KWayland_autogen/EWIEGA46WW/moc_waylandconfig.cpp:143 #18 0x00007f63d3df208c in KScreen::WaylandConfig::removeOutput (this=0x560bd91bbfe0, output=<optimized out>) at ./backends/kwayland/waylandconfig.cpp:253 #19 0x00007f640d79391f in QtPrivate::QSlotObjectBase::call (a=0x7fff51f2ca20, r=0x560bd91bbfe0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:394 #20 QMetaObject::activate (sender=0x560bd9240f00, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3789 #21 0x00007f640d79391f in QtPrivate::QSlotObjectBase::call (a=0x7fff51f2cb20, r=0x560bd9240f00, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:394 #22 QMetaObject::activate (sender=0x560bd91c82a0, signalOffset=<optimized out>, local_signal_index=<optimized out>, argv=<optimized out>) at kernel/qobject.cpp:3789 #23 0x00007f640d79391f in QtPrivate::QSlotObjectBase::call (a=0x7fff51f2cc80, r=0x560bd91c82a0, this=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qobjectdefs_impl.h:394 #24 QMetaObject::activate (sender=0x560bd9138a00, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=77, argv=<optimized out>, argv@entry=0x7fff51f2cc80) at kernel/qobject.cpp:3789 #25 0x00007f640d793ec7 in QMetaObject::activate (sender=<optimized out>, m=m@entry=0x7f6400003360 <KWayland::Client::Registry::staticMetaObject>, local_signal_index=local_signal_index@entry=77, argv=argv@entry=0x7fff51f2cc80) at kernel/qobject.cpp:3660 #26 0x00007f63ffdbff81 in KWayland::Client::Registry::interfaceRemoved (this=<optimized out>, _t1=<optimized out>) at ./obj-x86_64-linux-gnu/src/client/KF5WaylandClient_autogen/EWIEGA46WW/moc_registry.cpp:1597 It seems that in KScreen : void WaylandConfig::removeOutput(WaylandOutput *output) { if (m_initializingOutputs.removeOne(output)) { // output was not yet fully initialized, just remove here and return delete output; return; } // remove the output from output mapping Q_ASSERT(m_outputMap.take(output->id()) == output); m_screen->setOutputs(m_outputMap.values()); delete output; if (!m_blockSignals) { Q_EMIT configChanged(); } } Somehow does not remove the output from m_outputMap causing down the line a classic null pointer segfault. Could output be nullpointer ? The issue could be in WaylandConfig::addOutput and how the WaylandOutput is set up : void WaylandConfig::addOutput(quint32 name, quint32 version) { WaylandOutput *waylandoutput = new WaylandOutput(++s_outputId, this); m_initializingOutputs << waylandoutput; connect(waylandoutput, &WaylandOutput::deviceRemoved, this, [this, waylandoutput]() { removeOutput(waylandoutput); }); waylandoutput->createOutputDevice(m_registry, name, version); // finalize: when the output is done, we put it in the known outputs map, // remove if from the list of initializing outputs, and emit configChanged() connect(waylandoutput, &WaylandOutput::complete, this, [this, waylandoutput]{ m_outputMap.insert(waylandoutput->id(), waylandoutput); m_initializingOutputs.removeOne(waylandoutput); checkInitialized(); if (!m_blockSignals && m_initializingOutputs.empty()) { m_screen->setOutputs(m_outputMap.values()); Q_EMIT configChanged(); } connect(waylandoutput, &WaylandOutput::changed, this, [this]() { if (!m_blockSignals) { Q_EMIT configChanged(); } }); }); } -- You are receiving this mail because: You are watching all bug changes.
