[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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https://bugs.freedesktop.org/show_bug.cgi?id=93425

            Bug ID: 93425
           Summary: d3dadapter.so (gallium-nine) segfaults since Mesa
                    11.0/LLVM 3.7
           Product: Mesa
           Version: 11.0
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: carmenbbakker2@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

On Arch Linux, when using mesa >=11.0 and llvm-libs >=3.7, any use of
gallium-nine segfaults.

The bug is also reported here to the team behind gallium-nine, with more
detailed information: https://github.com/iXit/Mesa-3D/issues/163

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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https://bugs.freedesktop.org/show_bug.cgi?id=93425

--- Comment #1 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Judging by the gallium-nine bug report, this is a problem of translating TGSI
to LLVM IR, but that code is used all the time, so it's not obvious what the
problem is.

Can you reproduce the crash with LLVM compiled as a Debug build with debug
symbols and post a new backtrace? (Be sure to also recompile Mesa, to exclude
the possibility that there have been ABI changes.)

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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https://bugs.freedesktop.org/show_bug.cgi?id=93425

--- Comment #2 from Christoph Haag <haagch@frickel.club> ---
When compiling llvm with -DCMAKE_BUILD_TYPE=Debug and
-DCMAKE_BUILD_TYPE=RelWithDebInfo and, it works.

When compiling llvm with DCMAKE_BUILD_TYPE=Release, it doesn't work.

*sigh*

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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https://bugs.freedesktop.org/show_bug.cgi?id=93425

--- Comment #3 from Christoph Haag <haagch@frickel.club> ---
I think it's a similar alignment bug like the one clang has produced some time
ago for me when compiling llvm: https://llvm.org/bugs/show_bug.cgi?id=21097#c4

0x78f6f76e in LLVMAddTargetDependentFunctionAttr () from
/usr/lib32/libLLVM-3.8svn.so
Wine-gdb> disassemble
Dump of assembler code for function LLVMAddTargetDependentFunctionAttr:
   0x78f6f730 <+0>:     push   %ebp
   0x78f6f731 <+1>:     push   %edi
   0x78f6f732 <+2>:     push   %esi
   0x78f6f733 <+3>:     push   %ebx
   0x78f6f734 <+4>:     sub    $0x108c,%esp
   0x78f6f73a <+10>:    orl    $0x0,(%esp)
   0x78f6f73e <+14>:    add    $0x1010,%esp
   0x78f6f744 <+20>:    pxor   %xmm0,%xmm0
   0x78f6f748 <+24>:    mov    0x98(%esp),%eax
   0x78f6f74f <+31>:    lea    0x2c(%esp),%edx
   0x78f6f753 <+35>:    mov    0x90(%esp),%esi
   0x78f6f75a <+42>:    mov    0x94(%esp),%ebp
   0x78f6f761 <+49>:    mov    %gs:0x14,%ecx
   0x78f6f768 <+56>:    mov    %ecx,0x6c(%esp)
   0x78f6f76c <+60>:    xor    %ecx,%ecx
=> 0x78f6f76e <+62>:    movaps %xmm0,0x40(%esp)
   0x78f6f773 <+67>:    movl   $0x0,0x20(%esp)
   0x78f6f77b <+75>:    movl   $0x0,0x24(%esp)
   0x78f6f783 <+83>:    lea    0x20(%esp),%edi
   0x78f6f787 <+87>:    movaps %xmm0,0x50(%esp)

Googling "llvm movaps alignment" brings up several related bugs.

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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https://bugs.freedesktop.org/show_bug.cgi?id=93425

Nicolai Hähnle <nhaehnle@gmail.com> changed:

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

--- Comment #4 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Thanks, that was very helpful debugging work on your part! :)
I guess the ball on this one is already in the Clang and/or LLVM court.

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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https://bugs.freedesktop.org/show_bug.cgi?id=93425

--- Comment #5 from Christoph Haag <haagch@frickel.club> ---
I compiled llvm with

-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_C_FLAGS:STRING="-m32 -mstackrealign" \
-DCMAKE_CXX_FLAGS:STRING="-m32 -mstackrealign" \

and this works too.

So I suppose this is related to https://bugs.archlinux.org/task/27560

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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--- Comment #6 from Matthew Scheirer <matt.scheirer@gmail.com> ---
For me mstackrealign has no effect but compiling in debug or debinfo works on
3.7.0. What more is debinfo doing beyond stack alignment that could correct
issues otherwise unresolved?

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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https://bugs.freedesktop.org/show_bug.cgi?id=93425

--- Comment #7 from Christoph Haag <haagch@frickel.club> ---
Created attachment 120601
  --> https://bugs.freedesktop.org/attachment.cgi?id=120601&action=edit
disassembled release build vs relwithdeb build

relwithdeb isn't *actually* a release build.

It does not produce the problematic movaps instructions at all.

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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--- Comment #8 from Christoph Haag <haagch@frickel.club> ---
Created attachment 120603
  --> https://bugs.freedesktop.org/attachment.cgi?id=120603&action=edit
disassembled release build with -mstackrealign

Here is my release build with -mstackrealign that works:

http://haagch.frickel.club/files/lib32-llvm-libs-svn-256101-1-x86_64.pkg.tar.gz
http://haagch.frickel.club/files/lib32-llvm-svn-256101-1-x86_64.pkg.tar.gz

They are compiled with -march=native for my ivy bridge cpu, so maybe that has
some influence.

Disassembling the same function shows different offsets for movaps:

   0x0047a805 <+69>:    movaps %xmm0,-0x48(%ebp)

   0x0047a815 <+85>:    movaps %xmm0,-0x38(%ebp)

You can check with

gdb -q /usr/lib32/libLLVM-3.8svn.so -ex "disassemble
LLVMAddTargetDependentFunctionAttr"

Probably:
movaps %xmm0,-0x48(%ebp) is right
movaps %xmm0,-0x40(%ebp) is wrong

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[Bug 93425] d3dadapter.so (gallium-nine) segfaults since Mesa 11.0/LLVM 3.7

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--- Comment #9 from Matthew Scheirer <matt.scheirer@gmail.com> ---
False alarm I guess, I just tried your svn package and the upstream mesagit one
and both are working now. Wondering what changed between last night when they
announced that package was working and now...

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