[Bug 204181] NULL pointer dereference regression in amdgpu

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

https://bugzilla.kernel.org/show_bug.cgi?id=204181

--- Comment #36 from Sergey Kondakov (virtuousfox@xxxxxxxxx) ---
(In reply to Nicholas Kazlauskas from comment #35)
> Do you mind posting your compositor settings in plasma? That would certainly
> influence flip timing and submission and I haven't been able to reproduce
> the issue with the settings I'm using.

Sure. They are also quite funky:
~/.config/kwinrc:
[Compositing]
AnimationSpeed=2
Backend=OpenGL
Enabled=true
GLColorCorrection=true
GLCore=true
GLPlatformInterface=glx
GLPreferBufferSwap=c
GLTextureFilter=2
HiddenPreviews=5
OpenGLIsUnsafe=false
OpenGLIsUnsafe0=false
OpenGLIsUnsafe1=false
UnredirectFullscreen=false
WindowsBlockCompositing=false
XRenderSmoothScale=false

However, I run LXQt with this in startup /usr/local/bin/kwin.sh script:
export __GL_YIELD=USLEEP
export KWIN_TRIPLE_BUFFER=0
export KWIN_USE_BUFFER_AGE=1
export KWIN_OPENGL_INTERFACE=egl
export KWIN_DIRECT_GL=1
export KWIN_FORCE_LANCZOS=1
export KWIN_PERSISTENT_VBO=1
export KWIN_EFFECTS_FORCE_ANIMATIONS=1
…
if [ -z "$WAYLAND_DISPLAY" ]; then
        export WINDOWMANAGER="env mesa_glthread=true nice -n -5 ionice -c 2 -n
0 -t chrt -v -r 5 kwin_x11 $KWIN_OPTIONS"
        exec /etc/X11/xinit/xinitrc
        return 0
else
        export WINDOWMANAGER="env mesa_glthread=true nice -n -5 ionice -c 2 -n
0 -t chrt -v -r 5 kwin_wayland"
        export QT_QPA_PLATFORM=wayland-egl
        export GDK_BACKEND=wayland
        export CLUTTER_BACKEND=wayland
        export SDL_VIDEODRIVER=wayland
        return 0
fi

X is run by /usr/local/bin/Xhp:
nice -n -10 ionice -c 2 -n 0 -t chrt -v -r 10 X "$@"
It hangs the system, by the way, if RT limit is not set by sched_rt_runtime_us

Here's ~/.drirc, just in case:
<driconf>
    <device screen="0" driver="radeonsi">
        <application name="Default">
            <option name="allow_glsl_relaxed_es" value="true" />
            <option name="radeonsi_enable_sisched" value="true" />
            <option name="allow_glsl_builtin_const_expression" value="true" />
            <option name="mesa_glthread" value="true" />
            <option name="radeonsi_enable_nir" value="true" />
            <option name="allow_glsl_extension_directive_midshader"
value="true" />
            <option name="allow_rgb10_configs" value="true" />
            <option name="allow_glsl_cross_stage_interpolation_mismatch"
value="true" />
            <option name="radeonsi_assume_no_z_fights" value="true" />
            <option name="allow_glsl_builtin_variable_redeclaration"
value="true" />
            <option name="allow_glsl_layout_qualifier_on_function_parameters"
value="true" />
            <option name="adaptive_sync" value="true" />
            <option name="radeonsi_commutative_blend_add" value="true" />
            <option name="allow_higher_compat_version" value="true" />
        </application>
    </device>
</driconf>

Some things from tuned.conf:
governor=schedutil
transparent_hugepages=always
/sys/kernel/mm/ksm/sleep_millisecs=250
/sys/kernel/mm/transparent_hugepage/shmem_enabled=advise 
/sys/kernel/mm/transparent_hugepage/defrag=defer+madvise
/sys/kernel/mm/transparent_hugepage/khugepaged/defrag=0
/sys/kernel/mm/transparent_hugepage/khugepaged/pages_to_scan=512
/sys/kernel/mm/transparent_hugepage/khugepaged/scan_sleep_millisecs=1000
/sys/kernel/mm/transparent_hugepage/khugepaged/alloc_sleep_millisecs=10000
dev.hpet.max-user-freq=4096
vm.zone_reclaim_mode=0
kernel.sched_autogroup_enabled=0
kernel.sched_latency_ns=1000000
kernel.sched_min_granularity_ns=100000
kernel.sched_wakeup_granularity_ns=1000
kernel.sched_nr_migrate=256
kernel.sched_migration_cost_ns=125
kernel.sched_cfs_bandwidth_slice_us=100
kernel.sched_tunable_scaling=1
kernel.sched_rt_period_us=1000000
kernel.sched_rt_runtime_us=900000
kernel.sched_rr_timeslice_ms=3

Originally the issue manifested with GLPreferBufferSwap=n and without
double-buffering & EGL enforcement, I've made those in hope to compensate for
disabled TearFree and PageFlip.

Please, answer the question about TearFree, if you can. I've been trying to
find out since its creation and wasn't able to get even a hint. Can it really
be just this perfect thing that everyone should have all the time, unless buged
?

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