[Bug 75005] New: "Upvoid" segfault in radeonsi/llvm

[Bug 75005] New: "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

          Priority: medium
            Bug ID: 75005
          Assignee: dri-devel@lists.freedesktop.org
           Summary: "Upvoid" segfault in radeonsi/llvm
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: haagch.christoph@googlemail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Created attachment 94105
  --> https://bugs.freedesktop.org/attachment.cgi?id=94105&action=edit
gdb "bt full" of the segfault

Software: Latest mesa git etc.

The program causing it is closed source: https://upvoid.com/

On intel ivy bridge it works.

On radeonsi it segfaults every time when starting the game.

full gdb backtrace with at least most debug information is attached.

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #1 from Tom Stellard <tstellar@gmail.com> ---
Can you also post the output produced with the environment variable:
R600_DEBUG=ps,vs

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #2 from Christoph Haag <haagch.christoph@googlemail.com> ---
Created attachment 94106
  --> https://bugs.freedesktop.org/attachment.cgi?id=94106&action=edit
stderr with R600_DEBUG=ps,vs

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

Tom Stellard <tstellar@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |75276

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #3 from Tom Stellard <tstellar@gmail.com> ---
Can you try this patch: https://bugs.freedesktop.org/attachment.cgi?id=94675

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #4 from Christoph Haag <haagch.christoph@googlemail.com> ---
Created attachment 94690
  --> https://bugs.freedesktop.org/attachment.cgi?id=94690&action=edit
GPU fault after it sort of works with patch from #3

Well.

At least initially it does not crash anymore. It does start now. Nice!

The problems begin very quickly after gameplay with GPU faults in the attached
dmesg. Amazingly it keeps running with decent FPS for some time while these GPU
faults are dumped into the log. But eventually the system will hard lockup (I
got to 160 MB log before the lockup so I arbitrarily trimmed after the first
few GPU fault messages).
This was with R600_DEBUG=nohyperz, by the way.



I have also once seen another segfault in radeonsi, but I didn't have debug
symbols at that time and haven't reproduced it with debug symbols now, because
the hard lockup after a few seconds of gameplay is a bit annoying when trying
to reproduce something. :)
Maybe I can give a better backtrace later, but maybe it's unrelated.

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #5 from Tom Stellard <tstellar@gmail.com> ---
Can you try this branch:
http://cgit.freedesktop.org/~tstellar/llvm/log/?h=si-spill-fixes

If you experience any crashes or hangs please post the output of
R600_DEBUG=ps,vs,gs

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 1961 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=75005

Christoph Haag <haagch.christoph@googlemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #94106|0                           |1
        is obsolete|                            |

--- Comment #6 from Christoph Haag <haagch.christoph@googlemail.com> ---
Created attachment 95062
  --> https://bugs.freedesktop.org/attachment.cgi?id=95062&action=edit
stderr of upvoid with R600_DEBUG=ps,vs,gs that triggered GPU fault

(In reply to comment #5)
> Can you try this branch:
> http://cgit.freedesktop.org/~tstellar/llvm/log/?h=si-spill-fixes
> 
> If you experience any crashes or hangs please post the output of
> R600_DEBUG=ps,vs,gs

I wasted some time compiling, clang was fixed for this branch version in
202737... Just in case anyone else is trying this.

Anyway, my very comprehensive tests of about 5 runs :) seem like the GPU faults
and hangs still happen, mostly if the game window is maximized.

If it is not maximized and only a small window it does run longer and much more
rarely hangs the GPU, and sometimes the game fails in several ways. That might
be partly due to it being an alpha release, but maybe sometimes it's because of
the driver? Don't know. Maybe you can decide whether it is caused by the
problems here or needs new bugs.

E.g. this results in SIGABRT and then(?) SIGILL:
UpvoidEngine: r600_query.c:749: r600_suspend_nontimer_queries: Assertion
`ctx->num_cs_dw_nontimer_queries_suspend == 0' failed.
I can post a full backtrace if you want.



It's currently segfaulting too much in unrelated code to get the segfault
backtrace I originally wanted that involves almost only radeonsi, so I'll just
attach the stderr output of one of the gpu fault hangs with R600_DEBUG=ps,vs,gs
and try again later.

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #7 from Tom Stellard <tstellar@gmail.com> ---
Is there anything printed to your dmesg log when the game locks up?

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

Christoph Haag <haagch.christoph@googlemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #94690|0                           |1
        is obsolete|                            |

--- Comment #8 from Christoph Haag <haagch.christoph@googlemail.com> ---
Created attachment 97307
  --> https://bugs.freedesktop.org/attachment.cgi?id=97307&action=edit
dmesg with patched llvm

Sorry, I wasn't very active recently.

I'm not sure what you're asking for. In comment #4 there is a whole dmesg, but
I can add another one...

I am using linux 3.14 by now and recent mesa git, but with your branch of llvm.

I can maybe add a few details to the behavior:
When starting upvoid it displays a menu over a view of the game world. The gpu
faults start appearing in dmesg right when it starts displaying this. It
doesn't directly lockup and keeps rendering relatively well. When starting the
game I can walk and look around a bit and I noticed: When looking at the ground
the messages stop, but when looking in the distance, the messages are again
created, so I would think it's directly related to the complexity of the stuff
it is rendering.

After a while the game window stops reacting. At this point the game will take
up 100% "red" cpu time in htop and shortly after that the whole machine will
hard lockup.

I can't say if the lockup is because of excessive error logging or not. dmesg
--follow | pv > /dev/null says it's about 35 kilobyte/second.

The dmesg here is from starting the game, waiting a few seconds and then
killing it. When killing it early enough it doesn't seem to cause any problems,
seems to recover nicely.

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

Christoph Haag <haagch.christoph@googlemail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #95062|0                           |1
        is obsolete|                            |

--- Comment #9 from Christoph Haag <haagch.christoph@googlemail.com> ---
Created attachment 97308
  --> https://bugs.freedesktop.org/attachment.cgi?id=97308&action=edit
more recent R600_DEBUG=ps,vs,gs that triggers gpu fault

Since there were some updates, maybe this should be updated too...

I have tried to take an apitrace but apitrace segfaults (?) when replaying it,
so I can post that too when I can resolve that.

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #10 from Christoph Haag <haagch.christoph@googlemail.com> ---
(In reply to comment #9)
> I have tried to take an apitrace but apitrace segfaults (?) when replaying
> it, so I can post that too when I can resolve that.

That was actually just my failure to use it correctly. With apitrace replay
--core it works:

64 Megabyte download, 101 Megabyte uncompressed:
http://w3studi.informatik.uni-stuttgart.de/~haagch/UpvoidEngine.trace.bz2

Replaying this renders on intel without bigger problems, but on my HD 7970M it
creates GPU faults (but not so much that it causes a lockup).

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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[-- Attachment #1.1: Type: text/plain, Size: 281 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #11 from Tom Stellard <tstellar@gmail.com> ---
Can you test this branch:
http://cgit.freedesktop.org/~tstellar/llvm/log/?h=si-spill-fixes-v2

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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[-- Attachment #1.1: Type: text/plain, Size: 559 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #12 from Christoph Haag <haagch.christoph@googlemail.com> ---
(In reply to comment #11)
> Can you test this branch:
> http://cgit.freedesktop.org/~tstellar/llvm/log/?h=si-spill-fixes-v2

I'm using 3.15-rc3 by now and I don't know whether it's fixes in linux or fixes
in llvm, but there are no gpu faults and no crashes anymore.

At least for the few minutes I have "tested" for now it worked absolutely fine.

Awesome!

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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[-- Attachment #1.1: Type: text/plain, Size: 735 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #13 from Tom Stellard <tstellar@gmail.com> ---
(In reply to comment #12)
> (In reply to comment #11)
> > Can you test this branch:
> > http://cgit.freedesktop.org/~tstellar/llvm/log/?h=si-spill-fixes-v2
> 
> I'm using 3.15-rc3 by now and I don't know whether it's fixes in linux or
> fixes in llvm, but there are no gpu faults and no crashes anymore.
> 
> At least for the few minutes I have "tested" for now it worked absolutely
> fine.
> 
> Awesome!

Thanks for testing.  I made a few improvements, can you test this branch:
http://cgit.freedesktop.org/~tstellar/llvm/log/?h=si-spill-fixes-v3

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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[-- Attachment #1.1: Type: text/plain, Size: 291 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=75005

--- Comment #14 from Christoph Haag <haagch.christoph@googlemail.com> ---
Seems to still work fine for Upvoid, at least when only running it for very few
minutes.

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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[-- Attachment #1.1: Type: text/plain, Size: 510 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=75005

Tom Stellard <tstellar@gmail.com> changed:

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

--- Comment #15 from Tom Stellard <tstellar@gmail.com> ---
I have committed a fix for this.

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[Bug 75005] "Upvoid" segfault in radeonsi/llvm

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https://bugs.freedesktop.org/show_bug.cgi?id=75005
Bug 75005 depends on bug 75276, which changed state.

Bug 75276 Summary: Implement VGPR Register Spilling
https://bugs.freedesktop.org/show_bug.cgi?id=75276

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

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