* [Bug 111241] Shadertoy shader causing hang
@ 2019-07-28 18:06 bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
Bug ID: 111241
Summary: Shadertoy shader causing hang
Product: Mesa
Version: 19.1
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel@lists.freedesktop.org
Reporter: mail@felix-potthast.de
QA Contact: dri-devel@lists.freedesktop.org
When opening https://www.shadertoy.com/view/3lsXDB on my Desktop PC
with Radeon HD 7870 Graphics card (Pitcairn) i get a freeze.
It works fine on my Laptop with Intel Graphics.
Both systems use Mesa 19.1.3
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* [Bug 111241] Shadertoy shader causing hang
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #1 from Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> ---
I could reproduce the issue on a Raven Ridge and a Navi10.
But when using NIR (radeonsi_enable_nir=true env variable) the shader is
perfectly usable.
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* [Bug 111241] Shadertoy shader causing hang
2019-07-28 18:06 [Bug 111241] Shadertoy shader causing hang bugzilla-daemon
2019-08-08 21:34 ` bugzilla-daemon
@ 2019-08-09 0:15 ` bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #2 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
RX 580 / NIR
amd-staging-drm-next
Mesa git
Firefox 68.0.1
[42489.228053] [drm:amdgpu_dm_commit_planes.constprop.0 [amdgpu]] *ERROR*
Waiting for fences timed out or interrupted!
[42494.348053] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but
soft recovered
[42508.171689] [drm:amdgpu_dm_commit_planes.constprop.0 [amdgpu]] *ERROR*
Waiting for fences timed out or interrupted!
[42513.035801] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but
soft recovered
[42556.811021] [drm:amdgpu_dm_commit_planes.constprop.0 [amdgpu]] *ERROR*
Waiting for fences timed out or interrupted!
[42561.418927] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but
soft recovered
[42571.658863] [drm:amdgpu_job_timedout [amdgpu]] *ERROR* ring gfx timeout, but
soft recovered
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* [Bug 111241] Shadertoy shader causing hang
2019-07-28 18:06 [Bug 111241] Shadertoy shader causing hang bugzilla-daemon
2019-08-08 21:34 ` bugzilla-daemon
2019-08-09 0:15 ` bugzilla-daemon
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #3 from Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> ---
Here's my understanding of the issue.
This shader uses 2 passes:
- the first pass has BufferA as input and output and does:
if (first frame)
// init bufferA content
else
// do something useful
- the 2nd pass has BufferA as input and does:
N = texelFetch(bufferA)
for(i=0; i < N; i++)
// do something
The problem here is the "// init bufferA content": it fails to initialize the
buffer content properly, leading to an infinite loop in the 2nd pass.
The exact code is:
if (iFrame==0) { O -= O; return; }
If one replaces this line with:
if (iFrame==0) { O = vec4(0.0f); return; }
The shader works fine (you can test the modified version here:
https://www.shadertoy.com/view/wtSXzw ).
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* [Bug 111241] Shadertoy shader causing hang
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #4 from Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> ---
Created attachment 144993
--> https://bugs.freedesktop.org/attachment.cgi?id=144993&action=edit
tgsi version of the shader
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #5 from Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> ---
Created attachment 144994
--> https://bugs.freedesktop.org/attachment.cgi?id=144994&action=edit
nir version
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* [Bug 111241] Shadertoy shader causing hang
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #6 from Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> ---
I've created a different shadertoy showing the problem:
https://www.shadertoy.com/view/Wt2SW1 (but this one doesn't hang the GPU).
The shader for "Buffer A" is:
0: MOV TEMP[0], SV[0]
1: MAD TEMP[0].y, SV[0], CONST[0][2].xxxx, CONST[0][2].yyyy
2: MOV OUT[0], IMM[0].xxxx
3: USEQ TEMP[1].x, CONST[0][1].xxxx, IMM[1].xxxx
4: UIF TEMP[1].xxxx
5: ADD TEMP[2], TEMP[2], -TEMP[2]
6: ELSE
[...]
13: MOV OUT[0], TEMP[2]
14: END
TEMP[2] is used before being assigned a value, so I suppose that's what allows
LLVM to turn line 5 in:
v_mov_b32_e32 v3, 0x7fc00000
v_mov_b32_e32 v2, 0x7fc00000
v_mov_b32_e32 v1, 0x7fc00000
v_mov_b32_e32 v0, 0x7fc00000
(ie: output is NaN)
A possible way to fix this is to transform "dst = x - x" operations in "dst =
0" which is what nir does in its nir_opt_algebraic pass.
I've open a MR to fix/discuss this issue:
https://gitlab.freedesktop.org/mesa/mesa/merge_requests/1681
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #7 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
Works for me with commit #
glsl: replace 'x + (-x)' with constant 0
https://cgit.freedesktop.org/mesa/mesa/commit/?id=47cc660d9c19572e5ef2dce7c8ae1766a2ac9885
Thanks Pierre-Eric!
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--- Comment #8 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
BTW
Pierre-Eric can you look into this
Shadertoy shader corruption, too?
https://www.shadertoy.com/view/Xt3cWS
I get it with
Konqueror 5.0.97
KDE Frameworks 5.61.0
Qt 5.13.0
And
Firefox 68.0.1
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--- Comment #9 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
Created attachment 145215
--> https://bugs.freedesktop.org/attachment.cgi?id=145215&action=edit
Shadertoy-EOT-Grid-scene-2.png
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--- Comment #10 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
(In reply to Dieter Nützel from comment #9)
> Created attachment 145215 [details]
> Shadertoy-EOT-Grid-scene-2.png
Saw it first @ 2. November 2018
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #11 from Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> ---
(In reply to Dieter Nützel from comment #8)
> BTW
>
> Pierre-Eric can you look into this
>
> Shadertoy shader corruption, too?
> https://www.shadertoy.com/view/Xt3cWS
>
The "Buffer A" shader doesn't write fragColor when uv.y is < 0.1 or > 0.9.
So the content is undefined and may be black on some platform or random.
radeonsi is correct here, but we might want to replace undef values with 0x0 to
get a default value instead of random.
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* [Bug 111241] Shadertoy shader causing hang
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #12 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
(In reply to Pierre-Eric Pelloux-Prayer from comment #11)
> (In reply to Dieter Nützel from comment #8)
> > BTW
> >
> > Pierre-Eric can you look into this
> >
> > Shadertoy shader corruption, too?
> > https://www.shadertoy.com/view/Xt3cWS
> >
>
> The "Buffer A" shader doesn't write fragColor when uv.y is < 0.1 or > 0.9.
>
> So the content is undefined and may be black on some platform or random.
>
> radeonsi is correct here, but we might want to replace undef values with 0x0
> to get a default value instead of random.
Cool to have you around for bug hunting...;-)
Any hints where I shoud change 'undef values with 0x0' for testing?
And sorry that I 'hijacked' this thread - should I open a new ticket?
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https://bugs.freedesktop.org/show_bug.cgi?id=111241
Timothy Arceri <t_arceri@yahoo.com.au> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #13 from Timothy Arceri <t_arceri@yahoo.com.au> ---
(In reply to Dieter Nützel from comment #12)
> (In reply to Pierre-Eric Pelloux-Prayer from comment #11)
> > (In reply to Dieter Nützel from comment #8)
> > > BTW
> > >
> > > Pierre-Eric can you look into this
> > >
> > > Shadertoy shader corruption, too?
> > > https://www.shadertoy.com/view/Xt3cWS
> > >
> >
> > The "Buffer A" shader doesn't write fragColor when uv.y is < 0.1 or > 0.9.
> >
> > So the content is undefined and may be black on some platform or random.
> >
> > radeonsi is correct here, but we might want to replace undef values with 0x0
> > to get a default value instead of random.
>
> Cool to have you around for bug hunting...;-)
>
> Any hints where I shoud change 'undef values with 0x0' for testing?
>
> And sorry that I 'hijacked' this thread - should I open a new ticket?
I don't think you need to open a bug for it at all. As its not a bug in Mesa
its a shader bug.
Closing this bug report as it should be fixed by:
commit 47cc660d9c19572e5ef2dce7c8ae1766a2ac9885
glsl: replace 'x + (-x)' with constant 0
This fixes a hang in shadertoy for radeonsi where a buffer was initialized
with:
value -= value
with value being undefined.
In this case LLVM replace the operation with an assignment to NaN.
Cc: 19.1 19.2 <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111241
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
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--- Comment #14 from Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com> ---
> > And sorry that I 'hijacked' this thread - should I open a new ticket?
>
> I don't think you need to open a bug for it at all. As its not a bug in Mesa
> its a shader bug.
>
It's not a bug in Mesa but if adopting the same behavior than other drivers is
cheap performance-wise I think we should consider it.
For instance, adding a prolog to PS that always initializes v0, v1, v2 to 0
could do the trick... maybe there are other/better ways though.
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2019-08-09 16:22 ` bugzilla-daemon
2019-08-14 12:56 ` bugzilla-daemon
2019-08-29 23:57 ` bugzilla-daemon
2019-08-30 0:05 ` bugzilla-daemon
2019-08-30 0:06 ` bugzilla-daemon
2019-08-30 0:11 ` bugzilla-daemon
2019-08-30 11:56 ` bugzilla-daemon
2019-08-30 23:57 ` bugzilla-daemon
2019-09-02 23:47 ` bugzilla-daemon
2019-09-03 12:00 ` bugzilla-daemon
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