Bug 94199 - Shader abort/crash
Summary: Shader abort/crash
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/i965 (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Matt Turner
QA Contact: Intel 3D Bugs Mailing List
Depends on:
Reported: 2016-02-17 23:21 UTC by Marc-Andre Lureau
Modified: 2016-02-25 18:53 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


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Description Marc-Andre Lureau 2016-02-17 23:21:01 UTC
The following snippet crashes with mesa

shader_runner: glsl/ir_validate.cpp:565: virtual ir_visitor_status {anonymous}::ir_validate::visit_leave(ir_expression*): Assertion `ir->operands[0]->type == glsl_type::uint_type' failed.

#4  0x00007ffff08b0dd4 in (anonymous namespace)::ir_validate::visit_leave (this=<optimized out>, ir=<optimized out>) at glsl/ir_validate.cpp:565
#5  0x00007ffff08ac206 in ir_assignment::accept (this=0x790fa0, v=0x7fffffffd4b0) at glsl/ir_hv_accept.cpp:304
#6  0x00007ffff08abc46 in visit_list_elements (v=v@entry=0x7fffffffd4b0, l=l@entry=0x7f9398, statement_list=statement_list@entry=true) at glsl/ir_hv_accept.cpp:55
#7  0x00007ffff08abda7 in ir_function_signature::accept (this=0x7f9350, v=0x7fffffffd4b0) at glsl/ir_hv_accept.cpp:115
#8  0x00007ffff08abc46 in visit_list_elements (v=v@entry=0x7fffffffd4b0, l=l@entry=0x78af78, statement_list=statement_list@entry=false) at glsl/ir_hv_accept.cpp:55
#9  0x00007ffff08abe1e in ir_function::accept (this=0x78af50, v=0x7fffffffd4b0) at glsl/ir_hv_accept.cpp:127
#10 0x00007ffff08abc46 in visit_list_elements (v=v@entry=0x7fffffffd4b0, l=l@entry=0x788c90, statement_list=statement_list@entry=true) at glsl/ir_hv_accept.cpp:55
#11 0x00007ffff08abaaa in ir_hierarchical_visitor::run (this=this@entry=0x7fffffffd4b0, instructions=instructions@entry=0x788c90) at glsl/ir_hierarchical_visitor.cpp:364
#12 0x00007ffff08b1e3b in validate_ir_tree (instructions=0x788c90) at glsl/ir_validate.cpp:912
#13 0x00007ffff0968544 in process_glsl_ir (shader_prog=0x794930, shader=0x793dd0, shader=0x793dd0, brw=0x7ffff7f71040, stage=MESA_SHADER_VERTEX) at brw_link.cpp:165
#14 brw_link_shader (ctx=0x7ffff7f71040, shProg=0x794930) at brw_link.cpp:205
#15 0x00007ffff0804892 in _mesa_glsl_link_shader (ctx=0x7ffff7f71040, prog=0x794930) at program/ir_to_mesa.cpp:3040
#16 0x00007ffff069c4ff in link_program (ctx=0x7ffff7f71040, program=3) at main/shaderapi.c:1048

GLSL >= 1.40

[vertex shader]
#version 140
in vec4 in_0;
smooth out vec4 ex_g9;
vec4 temp0[1];
uniform vsubo2 { vec4 vsubo2contents[1]; };
void main(void)
temp0[0].x = vsubo2contents[0].x;
temp0[0].y = vsubo2contents[0].y;
ex_g9 = vec4(( temp0[0] ));

[fragment shader]
#version 140
smooth in vec4 ex_g9;
out vec4 fsout_c0;
void main(void)
fsout_c0 = vec4(((ex_g9)));

Comment 1 Matt Turner 2016-02-18 00:35:14 UTC
I strongly suspect the vectorizer is combining the ubo_loads. I'll investigate.
Comment 2 Matt Turner 2016-02-22 17:40:11 UTC
I've sent a patch which fixes this:

[PATCH] glsl: Consider ubo_load to be a horizontal operation.

It should be upstream in a few days, and I've tagged it for stable.
Comment 3 Matt Turner 2016-02-25 18:53:17 UTC
Fixed by

commit 3da789f1e9e3eb027bcfdb9d9170e7b37160b5b9
Author: Matt Turner <mattst88@gmail.com>
Date:   Mon Feb 22 09:36:48 2016 -0800

    glsl: Consider ubo_load to be a horizontal operation.

Thanks for the report!

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