[Bug 86720] Europa Universalis 4 freezing during game start (10.3.3)

[Bug 86720] Europa Universalis 4 freezing during game start (10.3.3)

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https://bugs.freedesktop.org/show_bug.cgi?id=86720

            Bug ID: 86720
           Summary: Europa Universalis 4 freezing during game start
                    (10.3.3)
           Product: Mesa
           Version: 10.3
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: buchno@riseup.net

Created attachment 110028
  --> https://bugs.freedesktop.org/attachment.cgi?id=110028&action=edit
134220 line strace from loading game to freeze to force quit.

Europa Universalis 4 stops responding after loading from pressing "Play" in the
nation select screen.

Not present in Mesa 10.3.2, the problem was introduced in 10.3.3.
Related to the radeon driver, as the Intel driver works without issue.

OS: Arch Linux
GPU: Radeon HD 6950
GPU Driver: xf86-video-ati 7.5.0
CPU: Intel i5-2500K

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[Bug 86720] Europa Universalis 4 freezing during game start (10.3.3)

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--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Can you bisect Mesa?

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[Bug 86720] Europa Universalis 4 freezing during game start (10.3.3)

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https://bugs.freedesktop.org/show_bug.cgi?id=86720

Felix Schwarz <felix.schwarz@oss.schwarz.eu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |felix.schwarz@oss.schwarz.e
                   |                            |u
             Blocks|                            |77449

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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Eero Tamminen <eero.t.tamminen@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Europa Universalis 4        |[radeon] Europa Universalis
                   |freezing during game start  |4 freezing during game
                   |(10.3.3)                    |start (10.3.3)

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--- Comment #2 from glwhieuhghfbjds@riseup.net ---
After a couple of hours of compiling...

Commit e8c7affa66407932519fc6d82a449b453343d9fc works fine.
Commit d26258166ca056da62536bebdf107e21d9ce92fb introduces the issue.

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--- Comment #3 from Marek Olšák <maraeo@gmail.com> ---
It looks like the R600 driver cannot handle some loops and hangs (in an
infinite loop probably).

There are some new fixes for Cayman in the master branch. Can you apply them
and see if they help?

http://cgit.freedesktop.org/mesa/mesa/log?qt=grep&q=r600

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--- Comment #4 from glwhieuhghfbjds@riseup.net ---
Commit 133280120b4bc714bbb7665e383f36ab262c280a, after the fixes for Cayman in
master, still has the issue.

Or did you mean of me to cherry-pick specific fixes?

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--- Comment #5 from Marek Olšák <maraeo@gmail.com> ---
(In reply to glwhieuhghfbjds from comment #4)
> Commit 133280120b4bc714bbb7665e383f36ab262c280a, after the fixes for Cayman
> in master, still has the issue.
> 
> Or did you mean of me to cherry-pick specific fixes?

No. It looks like Cayman still has some bugs.

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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--- Comment #6 from Joti Papadopoulos <pan.papadopoulos80@gmail.com> ---
Actually, i'm having this issue as well with a HD5850. So it's probably not
Cayman specific

OS: Arch Linux
GPU:Radeon HD5850
Mesa 10.3.5 and 10.5git(last tested about a week ago)
CPU:Phenom 2 X3 720

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--- Comment #7 from Artem Hluvchynskyi <excieve@gmail.com> ---
Same issue with HD5730 and mesa git: Mesa 10.5.0-devel (git-8d2542f).
Tried turning off every available graphics option in the game and using
"notiling" (which helped with a similar GPU lockup in Tropico 5) but nothing.

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--- Comment #8 from Artem Hluvchynskyi <excieve@gmail.com> ---
Created attachment 111977
  --> https://bugs.freedesktop.org/attachment.cgi?id=111977&action=edit
Part of the log during the lockup

Messages in the attached part of the log are repeating for a while, with
monitors going off and on. Eventually the system is usable for a while and then
just locks up for good, requiring a hard reset.

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--- Comment #9 from João Grego <jpgrego@gmail.com> ---
Having the same issue with HD5650. When using mesa 10.2.8 there was no problem,
but when I upgraded to mesa 10.4.2 the entire system froze after loading a
game, either new or saved.

OS: Gentoo amd64
GPU: Radeon HD5650
GPU driver: xf86-video-ati 7.5.0
Mesa: 10.4.2
CPU: intel i3 M370

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--- Comment #10 from Felix Schwarz <felix.schwarz@oss.schwarz.eu> ---
I can confirm that the issue was introduced (on master) with this commit:

commit 6fcb5520b78cdf1e5013c125501932315a069955
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Tue Oct 28 19:49:44 2014 +0100

    Revert "st/mesa: set MaxUnrollIterations = 255"

    This reverts commit 20836c81851e0df29a8ee9c86e5e5388738c840b.

    255 is a huge number. If you have a loop with 255 iterations, unrolling it
    will exceed the SM3 instruction limit. Let's use the default again.

    The comment about a SM3 limit doesn't make sense. For SM3, we generally
    want 32 (default) or a lower number due to the SM3 instruction limit, which
    is 512 instructions. For SM4, we can try higher numbers if needed, but
    some shaders can end up being pretty huge and shader compilation can take
    more time.

    This fixes a shader compile failure on R500/SM3. Reported on IRC.

    Cc: 10.2 10.3 <mesa-stable@lists.freedesktop.org>
    Reviewed-by: Brian Paul <brianp@vmware.com>


Marek: You mentioned that the r600 driver might be unable to handle certain
loops. Is there anything the community can do to get this fixed? apitrace?
Checking for piglit regressions related to the mentioned commit? I assume that
you would be able to fix this much better if you could reproduce the problem
easily.

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--- Comment #11 from Marek Olšák <maraeo@gmail.com> ---
I'd add a PIPE_CAP and allow the driver to set MaxUnrollIterations with it. For
r600g, the old value should be used. For other drivers, the new value should be
used.

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--- Comment #12 from Felix Schwarz <felix.schwarz@oss.schwarz.eu> ---
(In reply to Marek Olšák from comment #11)
> I'd add a PIPE_CAP and allow the driver to set MaxUnrollIterations with it.

"I'd add" as in "I plan to add" or as in "someone else should fix that by ..."?

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--- Comment #13 from Médéric Boquien <mboquien@free.fr> ---
For what it is worth, a temporary workaround would be setting R600_DEBUG=nosb.
I saw that in a comment about bug #88263 and it turns out to work.

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--- Comment #14 from Marek Olšák <maraeo@gmail.com> ---
Created attachment 113246
  --> https://bugs.freedesktop.org/attachment.cgi?id=113246&action=edit
patch

Hi guys, could you please test this patch?

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--- Comment #15 from Felix Schwarz <felix.schwarz@oss.schwarz.eu> ---
I applied your patch on top of mesa 7ea1e3749738c63388d3bcca327e4e4dd28f17b8
with llvm 3.5 and linux 3.18.5 and I can confirm that this problem fixes the
original problem as expected.

One thing that bothers me personally is that no piglit test went bad when the
initial change was committed. Marek do you think it would be a good idea as a
newbie project to come up with a minimal api trace and try to build a piglit
test preventing that kind of problem or is that likely to be a fruitless
effort?

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--- Comment #16 from Marek Olšák <maraeo@gmail.com> ---
Having a piglit test reproducing the issue would be very useful.

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--- Comment #17 from Joti Papadopoulos <pan.papadopoulos80@gmail.com> ---
I can confirm the patch fixes the issue here as well

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--- Comment #18 from Felix Schwarz <felix.schwarz@oss.schwarz.eu> ---
I created an API trace which reproduces the problem for me
(https://dl.dropboxusercontent.com/s/hc6v7gdcshj4ljd/eu4.trace-lockup.xz?dl=0 ,
120 MB, unfortunately trimming produces only invalid states).  The shaders
itself don't look to bad to me but I don't have any experience deducing a
miminal testcase from an apitrace (pointers welcome).

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Marek Olšák <maraeo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|maraeo@gmail.com            |

--- Comment #19 from Marek Olšák <maraeo@gmail.com> ---
(removing myself from the Cc list, already getting emails from dri-devel)

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Joe Glaser <jpg84@drexel.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #20 from Joe Glaser <jpg84@drexel.edu> ---
Hey everyone,

I am a bit new to working with Mesa and haven't needed to patch anything in it
before. However, I am experiencing the GPU overload mentioned in the OC's post
(Hitting Play at Nation Select causes the game to attempt to load, but crash
when displaying the units and requiring a system reboot). I'd like to apply
Marek Olšák's patch file, however I am unfamiliar with the commands I need to
use to run it on Fedora 21.

Any ideas?

OS: Fedora 21 x86_64 [Gnome3.14.2]
GPU: Radeon HD 6520G
GPU Driver: Gallium 0.4 on AMD SUMO
CPU: AMD A6-3420M APU with Radeon HD Graphics x4

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Joe Glaser <jpg84@drexel.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

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Joe Glaser <jpg84@drexel.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |critical

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--- Comment #21 from Benjamin Bellec <b.bellec@gmail.com> ---
@Joe Glaser
As said above, an easy workaround is to disable the r600 shader optimizer. Just
launch Steam like this:
$ R600_DEBUG=nosb steam

But performance will be not good, and you already have a weak GPU. If it's too
slow, then you can try to patch and build Mesa. You can follow this tutorial:
http://forums.fedora-fr.org/viewtopic.php?pid=532589
If you don't read french, you can translate the page with Google Chrome. The
translation is still... understandable.

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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https://bugs.freedesktop.org/show_bug.cgi?id=86720

--- Comment #22 from Médéric Boquien <mboquien@free.fr> ---
Has the patch been committed? I have just tried with Mesa 10.5.1 and the freeze
is still there. Thanks!

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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--- Comment #23 from Benjamin Bellec <b.bellec@gmail.com> ---
(In reply to Médéric Boquien from comment #22)
> Has the patch been committed? I have just tried with Mesa 10.5.1 and the
> freeze is still there. Thanks!

No the patch hasn't been committed. Some developer said the patch is not a
proper fix. Look at this for more information :
http://lists.freedesktop.org/archives/mesa-dev/2015-February/076633.html

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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--- Comment #24 from noga.dany@gmail.com ---
Still present in 10.6.1 and game is still unplayable on Radeon

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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https://bugs.freedesktop.org/show_bug.cgi?id=86720

--- Comment #25 from Felix Schwarz <felix.schwarz@oss.schwarz.eu> ---
For Fedora I have a COPR with the Fedora's mesa package plus the workaround
proposed by Marek on top. Other than that I think what is really needed as a
first step is to extract a minimal (piglit) test case.

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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--- Comment #26 from noga.dany@gmail.com ---
I tried run it with nosb parameters like mentioned above "R600_DEBUG=nosb
force_s3tc_enable=true /usr/bin/steam %U" and game works, but textures looks
very bad.

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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https://bugs.freedesktop.org/show_bug.cgi?id=86720

--- Comment #27 from Benjamin Bellec <b.bellec@gmail.com> ---
(In reply to noga.dany from comment #26)
> I tried run it with nosb parameters like mentioned above "R600_DEBUG=nosb
> force_s3tc_enable=true /usr/bin/steam %U" and game works, but textures looks
> very bad.

Remove the "force_s3tc_enable=true" in your command.

And be sure to have the s3tc lib installed (libtxc_dxtn). You can check that
with this command:
$ glxinfo |grep s3tc

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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https://bugs.freedesktop.org/show_bug.cgi?id=86720

--- Comment #28 from noga.dany@gmail.com ---
(In reply to Benjamin Bellec from comment #27)
> (In reply to noga.dany from comment #26)
> > I tried run it with nosb parameters like mentioned above "R600_DEBUG=nosb
> > force_s3tc_enable=true /usr/bin/steam %U" and game works, but textures looks
> > very bad.
> 
> Remove the "force_s3tc_enable=true" in your command.
> 
> And be sure to have the s3tc lib installed (libtxc_dxtn). You can check that
> with this command:
> $ glxinfo |grep s3tc

Ok, I have installed libtxc_dxtn 64bit and 32bit and tried it with
"R600_DEBUG=nosb /usr/bin/steam %U". Unfortunately it doesn't look good either.
Screenshot attached.
Mesa 10.6.4
Kernel 4.1.1
AMD HD 6870

So with nosb works but looks bad and without nosb it looks good, but system
freezes.

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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--- Comment #29 from noga.dany@gmail.com ---
Created attachment 117697
  --> https://bugs.freedesktop.org/attachment.cgi?id=117697&action=edit
screenshot with R600_DEBUG=nosb on Mesa 10.6.4 and AMD HD 6870

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3)

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https://bugs.freedesktop.org/show_bug.cgi?id=86720

--- Comment #30 from a.t.martens@gmail.com ---
(In reply to noga.dany from comment #29)
> Created attachment 117697 [details]
> screenshot with R600_DEBUG=nosb on Mesa 10.6.4 and AMD HD 6870

I think the graphics glitches that appear with nosb can be fixed if you disable
some of the effects. I can't remember which at the moment. I was able to run
with no apparent issues on my HD 6850 after turning on nosb.

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3+, still broken on 11.0.2)

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noga.dany@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|10.3                        |11.0
            Summary|[radeon] Europa Universalis |[radeon] Europa Universalis
                   |4 freezing during game      |4 freezing during game
                   |start (10.3.3)              |start (10.3.3+, still
                   |                            |broken on 11.0.2)

--- Comment #31 from noga.dany@gmail.com ---
Tested on 11.0.2 and still it freezes

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3+, still broken on 11.0.2)

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--- Comment #32 from Benjamin Bellec <b.bellec@gmail.com> ---
Marek pushed the fix.
So it's likely to be fixed in Mesa 11.0.4 which should be released in less than
a week.

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3+, still broken on 11.0.2)

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Fabio Pedretti <fabio.ped@libero.it> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3+, still broken on 11.0.2)

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Lukáš Krejza <gryffus@hkfree.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=93706

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3+, still broken on 11.0.2)

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--- Comment #33 from Lukáš Krejza <gryffus@hkfree.org> ---
I have found possibly related bug / regression on current Mesa git:
https://bugs.freedesktop.org/show_bug.cgi?id=93706

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[Bug 86720] [radeon] Europa Universalis 4 freezing during game start (10.3.3+, still broken on 11.0.2)

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https://bugs.freedesktop.org/show_bug.cgi?id=86720

iive@yahoo.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
           Assignee|dri-devel@lists.freedesktop |iive@yahoo.com
                   |.org                        |
         Resolution|FIXED                       |---
                 CC|                            |iive@yahoo.com

--- Comment #34 from iive@yahoo.com ---
Created attachment 125183
  --> https://bugs.freedesktop.org/attachment.cgi?id=125183&action=edit
EU4 shader #175 in TGSI , unoptmized disassembly, sbdump of all stages and
optimized disassembly

While the committed workaround does work for this case, the bug in R600 Shader
Backend is not fixed and it is triggered by other more complicated shaders. For
example:
https://bugs.freedesktop.org/show_bug.cgi?id=94900

I had locally reverted the unroll workaround in order to obtain the form that
triggers this bug. If you need to test the bug with this shader, then in
`r600_pipe.c:559` you have to set `PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT`
to 32, instead of 255.

The buggy shader is the vertex shader of call 1024042 in the trace.
When using `R600_DEBUG=ps,vs`, the shader is under #175 .


Like in the other bugreport, this shader causes assertion failure in the
sb_checker (if mesa is compiled with debugging) and the bug is also
workarounded by `R600_DEBUG=sbsafemath`.

This works because it disables the call to `fold_assoc()` in
`expr_handler::fold_alu_op2()` somewhere around `sb_expr.cpp:740`

In order to locate the bug, I've enabled the sbdump for all SB stages.

I'm also uploading a second log, with the "fold_assoc()" disabled, so a
side-by-side comparison of both logs could indicate how the function affects
the result through the different stages. (I recommend `diffuse` program.)

This shader is easier to analyze, because it contains just one loop with 4
iterations and no other conditional branches and jumps. The loop counter
register is used as index for memory access. The memory address calculations
might be involved in triggering the bug as `fold_assoc()` works on them.
The `sb_checker` complains about instructions that list the counter register,
so it is possible that the instruction that increments it is somehow
"optimized" out.

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