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Subject:	Re: [ANNOUNCEMENT] mesa 11.0.9-2
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References:	<announce DOT 201602220900 DOT u1M90xBM023169 AT int-mx11 DOT intmail DOT prod DOT int DOT phx2 DOT redhat DOT com> <570D122B DOT 50307 AT gmail DOT com> <570DAFFA DOT 7020700 AT cygwin DOT com> <b8ee7d32-504d-27d8-51ab-547ea7a51968 AT dronecode DOT org DOT uk> <4311402a-fb7d-c68a-9cb3-954161a37e58 AT dronecode DOT org DOT uk> <dc6a9435-58ca-36fd-8fa6-4f9da0b49b81 AT cygwin DOT com>
From:	Jon Turney <jon DOT turney AT dronecode DOT org DOT uk>
Message-ID:	<755f21b3-98aa-9283-0054-369bdb1657a0@dronecode.org.uk>
Date:	Mon, 6 Jun 2016 15:27:12 +0100
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On 06/06/2016 08:24, Yaakov Selkowitz wrote:
> On 2016-06-03 12:56, Jon Turney wrote:
>> On 31/05/2016 18:03, Jon Turney wrote:
>>>> # gdb ./quad-clip
>>>> [...]
>>>> (gdb) r
>>>> [...]
>>>> Program received signal SIGSEGV, Segmentation fault.
>>>> 0x7fdf00c1 in ?? ()
>> [...]
>>>> /usr/src/debug/mesa-demos-8.3.0-1/src/trivial/quad-clip.c:137
>>>> (gdb) disassemble 0x7fdf00b1,0x7fdf00d2
>>>> Dump of assembler code from 0x7fdf00b1 to 0x7fdf00d2:
>>>>    0x7fdf00b1:  insertps $0x10,0x4(%eax,%edi,1),%xmm0
>>>>    0x7fdf00b9:  insertps $0x20,0x8(%eax,%edi,1),%xmm0
>>>> => 0x7fdf00c1:  insertps $0x30,0xfffeff34,%xmm0
>>>>    0x7fdf00cb:  mov    (%esi),%eax
>>>>    0x7fdf00cd:  mul    %ecx
>>
>> After staring this a bit more, I see that this is the offset to the data
>> to load, apparently being used as an absolute address
>>
>> This seems to be the case with other addresses in the JIT-ed code,  so
>> perhaps there is some problem preventing relocations being applied...
>
> FWIW, I tried rebuilding with llvm 3.8.0.  32-bit doesn't crash anymore,
> and glxgears says its running, but only the background shows.

Thanks, that was next on my list to try

That sounds exactly like what I see with llvm svn r251761 [1] backported 
to 3.7.1 (without which we use the x86_64 loader on x86, rather than 
reporting an error, due to an interesting use of __builtin_undefined, 
with hilarious consequences)

I guess the output of the JIT code is ending up the wrong place as well, 
or something...

[1] http://llvm.org/viewvc/llvm-project?view=revision&revision=251761


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