https://bugs.kde.org/show_bug.cgi?id=505708

[email protected] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|WAITINGFORINFO              |---
             Status|NEEDSINFO                   |REPORTED

--- Comment #2 from [email protected] ---
(In reply to Nate Graham from comment #1)
> Weird! I have some questions:
> 
> 1. Does this ever happen with only the affected screen connected/in use?
> 2. Does this happen equally on both X11 and Wayland, or only in one session
> type?
> 3. Does this happen the same way in a new clean user account on the same
> computer?

1. Yes, always on G27Q monitor.
2. I mainly use Wayland and wasn't able to reproduce this issue with X11
3. It didn't reproduce until I set that monitor's refresh rate to 120 Hz (which
is what I also use on my main account). The monitor supports 144 Hz, 120 Hz and
60 Hz, and Plasma chose 144 Hz by default. It *seems* that the issue is only
reproducible with 120 Hz but could be a red herring that it does not happen
every time.

I have also attached gdb to ksplashqml process while it's frozen and this is
the backtrace:

#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007f7bf9b4f222 in sys_futex (addr1=addr1@entry=0x55ba47825f04, op=9,
val1=2, timeout=0x0, addr2=0x0, val3=-1) at ../src/util/futex.c:43
#2  futex_wait (addr=addr@entry=0x55ba47825f04, value=value@entry=2,
timeout=timeout@entry=0x0) at ../src/util/futex.c:55
#3  0x00007f7bf9b5c13d in do_futex_fence_wait
(fence=fence@entry=0x55ba47825f04, timeout=timeout@entry=false,
abs_timeout=abs_timeout@entry=0) at ../src/util/u_queue.c:131
#4  0x00007f7bf9b5d2cc in _util_queue_fence_wait (fence=0x55ba47825f04) at
../src/util/u_queue.c:146
#5  util_queue_fence_wait (fence=0x55ba47825f04) at ../src/util/u_queue.h:181
#6  util_queue_fence_wait (fence=0x55ba47825f04) at ../src/util/u_queue.h:178
#7  util_queue_finish (queue=queue@entry=0x55ba46d01b08) at
../src/util/u_queue.c:722
#8  0x00007f7bf9f8293e in si_set_debug_callback (ctx=0x55ba47f3aed0, cb=0x0) at
../src/gallium/drivers/radeonsi/si_pipe.c:442
#9  0x00007f7bf9f83117 in si_destroy_context (context=0x55ba47f3aed0) at
../src/gallium/drivers/radeonsi/si_pipe.c:196
#10 0x00007f7bf9d69b74 in tc_destroy (_pipe=0x55ba47f79f20) at
../src/gallium/auxiliary/util/u_threaded_context.c:5259
#11 0x00007f7bf977e614 in st_destroy_context_priv (st=st@entry=0x55ba480bb650,
destroy_pipe=destroy_pipe@entry=true) at
../src/mesa/state_tracker/st_context.c:358
#12 0x00007f7bf977fed0 in st_destroy_context (st=0x55ba480bb650) at
../src/mesa/state_tracker/st_context.c:975
#13 0x00007f7bf96e5c5f in dri_destroy_context (ctx=0x55ba46ea4ec0) at
../src/gallium/frontends/dri/dri_context.c:280
#14 0x00007f7bf96e96da in driDestroyContext (ctx=<optimized out>) at
../src/gallium/frontends/dri/dri_util.c:633
#15 0x00007f7c0993b8a9 in dri2_destroy_context (disp=<optimized out>,
ctx=0x55ba46f5f870) at ../src/egl/drivers/dri2/egl_dri2.c:1301
#16 dri2_destroy_context (disp=<optimized out>, ctx=0x55ba46f5f870) at
../src/egl/drivers/dri2/egl_dri2.c:1296
#17 0x00007f7c0992de19 in eglDestroyContext (dpy=<optimized out>,
ctx=0x55ba46f5f870) at ../src/egl/main/eglapi.c:926
#18 0x00007f7c1185a978 in QEGLPlatformContext::~QEGLPlatformContext
(this=0x55ba46ee9030, this=<optimized out>)
    at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/opengl/platform/egl/qeglplatformcontext.cpp:406
#19 0x00007f7c0bb1caed in
QtWaylandClient::QWaylandGLContext::~QWaylandGLContext (this=0x55ba46ee9030,
this=<optimized out>)
    at
/usr/src/debug/qtwayland-everywhere-src-6.9.1/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp:300
#20 0x00007f7c1175d20e in QOpenGLContext::destroy
(this=this@entry=0x7ffda2c87620) at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/kernel/qopenglcontext.cpp:461
#21 0x00007f7c1175d2eb in QOpenGLContext::~QOpenGLContext (this=0x7ffda2c87620,
this=<optimized out>) at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/kernel/qopenglcontext.cpp:488
#22 0x00007f7c11771fbd in QRhiGles2InitParams::newFallbackSurface (format=...)
at /usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/rhi/qrhigles2.cpp:604
#23 0x00007f7c125baff0 in QSGRhiSupport::maybeCreateOffscreenSurface
(this=<optimized out>, window=<optimized out>)
    at
/usr/src/debug/qtdeclarative-everywhere-src-6.9.1/src/quick/scenegraph/qsgrhisupport.cpp:901
#24 QSGRhiSupport::maybeCreateOffscreenSurface (this=<optimized out>,
window=<optimized out>)
    at
/usr/src/debug/qtdeclarative-everywhere-src-6.9.1/src/quick/scenegraph/qsgrhisupport.cpp:895
#25 0x00007f7c126eecd9 in QSGThreadedRenderLoop::handleExposure
(this=0x55ba46fe3260, window=0x55ba46f1c760)
    at
/usr/src/debug/qtdeclarative-everywhere-src-6.9.1/src/quick/scenegraph/qsgthreadedrenderloop.cpp:1314
#26 QSGThreadedRenderLoop::exposureChanged (this=0x55ba46fe3260,
window=0x55ba46f1c760)
    at
/usr/src/debug/qtdeclarative-everywhere-src-6.9.1/src/quick/scenegraph/qsgthreadedrenderloop.cpp:1248
#27 0x00007f7c114722fc in QWindow::event (this=0x55ba46f1c760, ev=<optimized
out>) at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/kernel/qwindow.cpp:2719
#28 0x00007f7c10bb8b28 in QCoreApplication::notifyInternal2
(receiver=0x55ba46f1c760, event=0x7ffda2c878d0)
    at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/corelib/kernel/qcoreapplication.cpp:1106
#29 0x00007f7c10bb917d in QCoreApplication::sendSpontaneousEvent
(receiver=<optimized out>, event=<optimized out>)
    at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/corelib/kernel/qcoreapplication.cpp:1560
#30 0x00007f7c1141f60d in QGuiApplicationPrivate::processExposeEvent
(e=0x55ba46f64d00) at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/kernel/qguiapplication.cpp:3480
#31 0x00007f7c1148052c in QWindowSystemInterface::sendWindowSystemEvents
(flags=flags@entry=...)
    at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/kernel/qwindowsysteminterface.cpp:1113
#32 0x00007f7c114806df in QWindowSystemInterface::flushWindowSystemEvents
(flags=...) at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/kernel/qwindowsysteminterface.cpp:1082
#33 0x00007f7c10c19c01 in doActivate<false> (sender=0x55ba46bb14a0,
signal_index=4, argv=0x7ffda2c87aa8) at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/corelib/kernel/qobject.cpp:4158
#34 0x00007f7c10e1debb in QEventDispatcherGlib::processEvents
(this=0x55ba46bb14a0, flags=...)
    at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/corelib/kernel/qeventdispatcher_glib.cpp:406
#35 0x00007f7c10bc3afb in QEventLoop::exec (this=0x7ffda2c87be0, flags=...) at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/corelib/global/qflags.h:77
#36 0x00007f7c10bbc40c in QCoreApplication::exec () at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/corelib/global/qflags.h:77
#37 0x00007f7c11417120 in QGuiApplication::exec () at
/usr/src/debug/qtbase-everywhere-src-6.9.1/src/gui/kernel/qguiapplication.cpp:1986
#38 0x000055ba3fa3b89f in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/debug/plasma-workspace-6.4.0/ksplash/ksplashqml/main.cpp:26

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