https://bugs.kde.org/show_bug.cgi?id=432574
--- Comment #3 from bluescreenaven...@gmail.com ---
OK, managed to catch it with
while [ 1 ]; do sudo gdb -p $(pidof kwin_wayland); done
from a second seat on one of my other scripted QEMU VMs that has 2 seats
#0 0x00000021 in ?? ()
No symbol table info available.
#1 0xaf96b59e in KWin::SceneOpenGL::createScene (parent=0x1f85440)
at /srcbuild/kwin/plugins/scenes/opengl/scene_opengl.cpp:472
backend = <optimized out>
scene = <optimized out>
__PRETTY_FUNCTION__ = "static KWin::SceneOpenGL*
KWin::SceneOpenGL::createScene(QObject*)"
#2 0xaf96b6d5 in KWin::OpenGLFactory::create (this=0x1f83c90,
parent=0x1f85440)
at /srcbuild/kwin/plugins/scenes/opengl/scene_opengl.cpp:2759
__PRETTY_FUNCTION__ = "virtual KWin::Scene*
KWin::OpenGLFactory::create(QObject*) const"
s = <optimized out>
#3 0xb734740f in KWin::Compositor::setupStart (this=<optimized out>) at
/srcbuild/kwin/composite.cpp:238
factory = {_M_t = {<std::__uniq_ptr_impl<KWin::SceneFactory,
std::default_delete<KWin::SceneFactory> >> = {
_M_t = {<std::_Tuple_impl<0, KWin::SceneFactory*,
std::default_delete<KWin::SceneFactory> >> = {<std::_Tuple_impl<1,
std::default_delete<KWin::SceneFactory> >> = {<std::_Head_base<1,
std::default_delete<KWin::SceneFactory>, true>> =
{<std::default_delete<KWin::SceneFactory>> = {<No data fields>}, <No data
fields>}, <No data fields>}, <std::_Head_base<0, KWin::SceneFactory*, false>> =
{_M_head_impl = 0x1f83c90}, <No data fields>}, <No data fields>}}, <No data
fields>}}
pluginIt = 0x1f85c20
type = <optimized out>
__for_range = @0xbfc42044: {d = 0x1eae000}
__for_begin = <optimized out>
__for_end = <optimized out>
supportedCompositors = {d = 0x1eae000}
userConfigIt = <optimized out>
availablePlugins = {d = 0x1f85c10}
compositingType = <optimized out>
__PRETTY_FUNCTION__ = {<optimized out> <repeats 36 times>}
#4 0xb7347eb4 in KWin::WaylandCompositor::start (this=0x1f85440) at
/srcbuild/kwin/composite.cpp:722
No locals.
#5 0xb76e5dc1 in ?? () from target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#6 0xb76ddca6 in QMetaCallEvent::placeMetaCall(QObject*) () from
target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#7 0xb76e0336 in QObject::event(QEvent*) () from
target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#8 0xb69bcd6c in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
--Type <RET> for more, q to quit, c to continue without paging--c
.so.5
No symbol table info available.
#9 0xb69c2d9f in QApplication::notify(QObject*, QEvent*) () from
target:/opt/lib/i386-linux-gnu/libQt5Widgets.so.5
No symbol table info available.
#10 0xb76c6cdd in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from
target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#11 0xb76c6d88 in QCoreApplication::sendEvent(QObject*, QEvent*) () from
target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#12 0xb76c6fbf in QCoreApplicationPrivate::sendPostedEvents(QObject*, int,
QThreadData*) () from target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#13 0xb76fc198 in
QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#14 0x0047b1f6 in
QUnixEventDispatcherQPA::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
()
No symbol table info available.
#15 0xb76c41c4 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
from target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#16 0xb76c8e9e in QCoreApplication::exec() () from
target:/opt/lib/i386-linux-gnu/libQt5Core.so.5
No symbol table info available.
#17 0xb7a1165e in QGuiApplication::exec() () from
target:/opt/lib/i386-linux-gnu/libQt5Gui.so.5
No symbol table info available.
#18 0xb69bb833 in QApplication::exec() () from
target:/opt/lib/i386-linux-gnu/libQt5Widgets.so.5
No symbol table info available.
#19 0x0043f432 in main (argc=<optimized out>, argv=<optimized out>) at
/srcbuild/kwin/main_wayland.cpp:800
userSignals = {__val = {2560, 0 <repeats 31 times>}}
environment = {d = {d = 0x1e80e70}}
a = {<KWin::ApplicationWaylandAbstract> = {<KWin::Application> =
{<QApplication> = {<No data fields>}, static staticMetaObject = {d = {superdata
= {direct = 0xb6d96374 <QApplication::staticMetaObject>}, stringdata =
0xb7474500 <qt_meta_stringdata_KWin__Application>, data = 0xb74743a0
<qt_meta_data_KWin__Application>, static_metacall = 0xb731ed5c
<KWin::Application::qt_static_metacall(QObject*, QMetaObject::Call, int,
void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static crashes = 0,
m_eventFilter = {d = 0x1ebd7c0}, m_configLock = false, m_config = {d =
0x1ebd850}, m_kxkbConfig = {d = 0x1ed9770}, m_operationMode =
KWin::Application::OperationModeXwayland, m_x11Time = 0, m_rootWindow = 0,
m_connection = 0x0, m_defaultScreen = 0x0, m_useKActivities = false, m_platform
= 0x1ed4f40, m_terminating = false, m_isClosingX11Connection = false}, static
staticMetaObject = {d = {superdata = {direct = 0xb751c154
<KWin::Application::staticMetaObject>}, stringdata = 0xb7474360
<qt_meta_stringdata_KWin__ApplicationWaylandAbstract>, data = 0xb7474320
<qt_meta_data_KWin__ApplicationWaylandAbstract>, static_metacall = 0xb731c9ac
<KWin::ApplicationWaylandAbstract::qt_static_metacall(QObject*,
QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}},
static staticMetaObject = {d = {superdata = {direct = 0xb751c13c
<KWin::ApplicationWaylandAbstract::staticMetaObject>}, stringdata = 0x47d2c0
<qt_meta_stringdata_KWin__ApplicationWayland>, data = 0x47d280
<qt_meta_data_KWin__ApplicationWayland>, static_metacall = 0x43f93a
<KWin::ApplicationWayland::qt_static_metacall(QObject*, QMetaObject::Call, int,
void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, m_startXWayland = true,
m_applicationsToStart = {<QList<QString>> = {<QListSpecialMethods<QString>> =
{<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value =
{<std::__atomic_base<int>> = {static _S_alignment = 4, _M_i = -1}, static
is_always_lock_free = true}}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d
= 0xb7757b30 <QListData::shared_null>}, d = 0xb7757b30
<QListData::shared_null>}}, <No data fields>}, m_inputMethodServerToStart =
{static null = {<No data fields>}, d = 0xb7757000 <QArrayData::shared_null>},
m_environment = {d = {d = 0x1e80e70}}, m_sessionArgument = {static null = {<No
data fields>}, d = 0x1ead060}, m_inputMethodProcess = 0x0,
m_inputMethodCrashTimer = <incomplete type>, m_inputMethodCrashes = 0,
m_xwayland = 0x0, m_settingsWatcher = {value = 0x0, d = 0x0}}
availablePlugins = {d = 0x1eb2490}
hasPlugin = {__availablePlugins = @0xbfc425c8}
hasSizeOption = <optimized out>
hasOutputCountOption = <optimized out>
hasX11Option = <optimized out>
hasVirtualOption = <optimized out>
hasWaylandOption = <optimized out>
hasFramebufferOption = <optimized out>
hasDrmOption = <optimized out>
xwaylandOption = {d = {d = 0x1eadc30}}
waylandSocketOption = {d = {d = 0x1eaee00}}
framebufferOption = {d = {d = 0x1eadfe0}}
framebufferDeviceOption = {d = {d = 0x1eabfb0}}
x11DisplayOption = {d = {d = 0x1eac130}}
waylandDisplayOption = {d = {d = 0x1eadca0}}
virtualFbOption = {d = {d = 0x1eaef60}}
widthOption = {d = {d = 0x1eaea70}}
heightOption = {d = {d = 0x1eabda0}}
scaleOption = {d = {d = 0x1eac270}}
outputCountOption = {d = {d = 0x1eb0910}}
waylandSocketFdOption = {d = {d = 0x1eb3a20}}
replaceOption = {d = {d = 0x1e89760}}
parser = {d = 0x1eacc60}
libinputOption = {d = {d = 0x1eae6b0}}
drmOption = {d = {d = 0x1eae720}}
inputMethodOption = {d = {d = 0x1eae790}}
listBackendsOption = {d = {d = 0x1eae830}}
screenLockerOption = {d = {d = 0x1eae900}}
noScreenLockerOption = {d = {d = 0x1eae970}}
noGlobalShortcutsOption = {d = {d = 0x1eaf160}}
exitWithSessionOption = {d = {d = 0x1eaf230}}
pluginName = {static null = {<No data fields>}, d = 0x47ea20
<KWin::s_drmPlugin::{lambda()#1}::operator()() const::qstring_literal>}
initialWindowSize = {wd = <optimized out>, ht = <optimized out>}
deviceIdentifier = {d = 0xb7757000 <QArrayData::shared_null>}
outputCount = <optimized out>
outputScale = <optimized out>
pluginIt = <optimized out>
server = <optimized out>
flags = {i = <optimized out>}
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