Bug 107879

Summary: crash happens when link program
Product: Mesa Reporter: xinghua <xinghua.cao>
Component: Drivers/DRI/i965Assignee: Jason Ekstrand <jason>
Status: RESOLVED FIXED QA Contact: Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity: normal    
Priority: medium CC: yang.gu, yunchao.he
Version: gitKeywords: bisected, regression
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
i915 platform: i915 features:
Attachments: verpixshader.c

Description xinghua 2018-09-10 04:30:42 UTC
Created attachment 141498 [details]

This issue happens on chrome when run this case, https://www.khronos.org/registry/webgl/sdk/tests/conformance2/glsl3/short-circuiting-in-loop-condition.html?webglVersion=2&quiet=0
But I also reproduced it when writing a simple case.
1. Download the attached file, and use "gcc -o verpixshader verpixshader.c -lX11 -lepoxy" to build target file.
2. run "./verpixshader", crash happens.

Note: It seems a regression of latest mesa code. And the crash stack is as below,
Thread 1 "verpixshader" received signal SIGSEGV, Segmentation fault.
validate_intrinsic_instr (state=<optimized out>, instr=0x555555ed4210) at nir/nir_validate.c:525
525	      validate_assert(state, dst->type == src->type);
(gdb) bt
#0  validate_intrinsic_instr (state=<optimized out>, instr=0x555555ed4210) at nir/nir_validate.c:525
#1  validate_instr (state=<optimized out>, instr=0x555555ed4210) at nir/nir_validate.c:631
#2  validate_block (state=<optimized out>, block=0x555555ef5680) at nir/nir_validate.c:713
#3  validate_cf_node (node=0x555555ef5680, state=<optimized out>) at nir/nir_validate.c:877
#4  0x00007ffff37f428b in validate_function_impl (state=<optimized out>, impl=<optimized out>) at nir/nir_validate.c:1095
#5  validate_function (state=0x7fffffffd940, func=0x55555590d690) at nir/nir_validate.c:1113
#6  nir_validate_shader (shader=shader@entry=0x555555ec4610) at nir/nir_validate.c:1224
#7  0x00007ffff3a32bdd in brw_nir_optimize (nir=nir@entry=0x555555ec4610, compiler=compiler@entry=0x55555579bf50, is_scalar=is_scalar@entry=true, allow_copies=allow_copies@entry=true)
    at compiler/brw_nir.c:584
#8  0x00007ffff3a34d45 in brw_preprocess_nir (compiler=0x55555579bf50, nir=nir@entry=0x555555ec4610) at compiler/brw_nir.c:685
#9  0x00007ffff38651c7 in brw_create_nir (brw=brw@entry=0x5555558c8e60, shader_prog=shader_prog@entry=0x555555903e60, prog=prog@entry=0x555555908330, stage=stage@entry=MESA_SHADER_FRAGMENT, 
    is_scalar=<optimized out>) at brw_program.c:106
#10 0x00007ffff38595b1 in brw_link_shader (ctx=0x5555558c8e60, shProg=0x555555903e60) at brw_link.cpp:267
#11 0x00007ffff36524e7 in _mesa_glsl_link_shader (ctx=ctx@entry=0x5555558c8e60, prog=prog@entry=0x555555903e60) at program/ir_to_mesa.cpp:3180
#12 0x00007ffff355075c in link_program (no_error=<optimized out>, shProg=<optimized out>, ctx=<optimized out>) at main/shaderapi.c:1211
#13 link_program_error (ctx=0x5555558c8e60, shProg=0x555555903e60) at main/shaderapi.c:1296
#14 0x00007ffff3550a97 in _mesa_LinkProgram (programObj=<optimized out>) at main/shaderapi.c:1789
#15 0x00005555555550ee in main ()
Comment 1 Tapani Pälli 2018-09-10 06:38:59 UTC
I've bisected this to quite old commit

--- 8< ---
commit 152057b138d58370f6b90406b07b2604439fabb7
Author: Jason Ekstrand <jason.ekstrand@intel.com>
Date:   Mon Mar 19 18:00:14 2018 -0700

    i965: Move nir_lower_deref_instrs to right before locals_to_regs
    Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
    Acked-by: Rob Clark <robdclark@gmail.com>
    Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
    Acked-by: Dave Airlie <airlied@redhat.com>
    Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Comment 2 Jason Ekstrand 2018-09-19 07:02:31 UTC
This is fixed by the following commit in master:

commit 864c780566b8782c4fc69b4337db768223717bd8
Author: Jason Ekstrand <jason.ekstrand@intel.com>
Date:   Tue Sep 11 12:55:45 2018 -0500

    nir/opt_if: Re-materialize derefs in use blocks before peeling loops
    Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107879
    Cc: "18.2" <mesa-stable@lists.freedesktop.org>
Comment 3 Yang Gu 2018-09-19 07:04:57 UTC
Created attachment 141651 [details]

Yang is OOO from Sep 17 to 20. Please expect slow response.
Comment 4 Mark Janes 2018-09-19 19:35:00 UTC
Jason: does this regression deserve a piglit test?
Comment 5 Jason Ekstrand 2018-09-19 19:52:49 UTC
Created attachment 141653 [details]

We could scrape the shader and make a glslparser test out of it

On September 19, 2018 21:35:01 bugzilla-daemon@freedesktop.org wrote:
> Comment # 4 on bug 107879 from Mark JanesJason: does this regression 
> deserve a piglit test?
> You are receiving this mail because:You are the assignee for the bug.

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