Bug 89957

Summary:	vm protection faults in piglit lest: texsubimage cube_map_array pbo
Product:	Mesa	Reporter:	Tom Stellard <tstellar>
Component:	Drivers/Gallium/radeonsi	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:	Default DRI bug account <dri-devel>
Severity:	normal
Priority:	medium
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Tom Stellard 2015-04-08 17:23:22 UTC

To reproduce:  /home/tstellar/piglit/bin/texsubimage cube_map_array pbo -auto -fbo

I've spent some time debugging this and it appears the result from the v_cubeid_f32
instruction is causing the shader to access memory outside the bounds of the texture.

If I replace v_cubeid_f32 $dst, $src0, $src1, $src2 instructions with v_mov_f32 $dst, 0.0 or v_mov_f32 $dst, 1.0
I no longer see vm protection faults.

However, if I replace the v_cubeid_f32 instructions with v_mov_f32 $dst, 2.0 then the vm protection faults return.  So, it seems the bad case is whenever the face id is computed as >= 2.0f.

Comment 1 Alex Deucher 2015-04-08 17:30:00 UTC

Possibly fixed by this patch:
http://lists.freedesktop.org/archives/mesa-dev/2015-April/081426.html
See also:
http://lists.freedesktop.org/archives/mesa-dev/2015-April/081424.html

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