[Piglit] Piglit tests that leave noise in dmesg on nvidia proprietary drivers

[Ilia Mirkin]

On Thu, Oct 20, 2016 at 3:27 PM, Dan Kegel <dank at kegel.com> wrote:
> Hi folks,
> a few piglit tests seem to leave a little noise in dmesg when run on
> nvidia proprietary drivers.
> Is this expected?
>
> 1)
>
> dmesg output:
> texsubimage[27980]: segfault at 20e0d20 ip 00007fc0492ce5d5 sp
> 00007ffc97347800 error 4 in
> libnvidia-glcore.so.370.28[7fc0481ad000+13bd000]
>
> reproducers:
> piglit/bin/texsubimage array pbo -auto -fbo
> piglit/bin/texsubimage array -auto -fbo
>
> 2)
>
> dmesg output:
> ext_texture_for[28147]: segfault at 0 ip 00007f35dc1ca385 sp
> 00007ffd0b13dda8 error 4 in libc-2.23.so[7f35dc07d000+1c0000]
>
> reproducer:
> piglit/bin/ext_texture_format_bgra8888-api-errors -auto -fbo
>
> 3)
>
> dmesg output:
> glslparsertest[28167]: segfault at 8 ip 00007fad84a0bb1e sp
> 00007ffe20214850 error 4 in
> libnvidia-glcore.so.370.28[7fad8463b000+13bd000]
>
> reproducers:
> piglit/bin/glslparsertest
> piglit/tests/spec/glsl-1.10/compiler/void/void-equal.vert fail 1.10
> piglit/bin/glslparsertest
> piglit/tests/spec/glsl-1.10/compiler/void/void-lt.vert fail 1.10
>
> 4)
>
> dmesg output: traps: glslparsertest[28205] trap divide error
> ip:7f871d7db4a3 sp:7ffc1b0064e8 error:0 in
> libnvidia-glcore.so.370.28[7f871d4ba000+13bd000]
>
> reproducers:
> piglit/bin/glslparsertest
> piglit/tests/spec/glsl-1.10/preprocessor/divide-by-zero.vert fail 1.10
> piglit/bin/glslparsertest
> piglit/tests/spec/glsl-1.10/preprocessor/modulus-by-zero.vert fail
> 1.10

It's expected that the Linux Kernel makes a note in dmesg when it
kills a process as a result of a signal (like SIGSEGV or SIGILL or
whatever). In all but case 2, the IP causing the fault is inside the
NVIDIA proprietary driver. I suspect that the piglit test for case 2
isn't sufficiently resilient to drivers doing odd things, but who
knows. (Or it could be the NVIDIA blob calling into libc with bs.)

Not sure if that answers your question...

  -ilia