[Bug 109488] Mesa 18.3.2 crash on a specific fragment shader (assert triggered) / already fixed on the master branch.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109488

            Bug ID: 109488
           Summary: Mesa 18.3.2 crash on a specific fragment shader
                    (assert triggered) / already fixed on the master
                    branch.
           Product: Mesa
           Version: 18.3
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: glsl-compiler
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: patrick9876 at free.fr
        QA Contact: intel-3d-bugs at lists.freedesktop.org

The following shader: https://www.shadertoy.com/view/ll3fz4 generates an
assert. The issue is fixed after applying the following commit:
76c27e47b90647df047e785d6b3ab5d0d979a1ee available on the master branch.

This commit: 76c27e47b90647df047e785d6b3ab5d0d979a1ee   is likely required on
the stable branch too.

With Mesa 18.3.2:
#3  0x00007ffff6ade5f2 in __assert_fail () from /lib64/libc.so.6
#4  0x00007ffff0693686 in (anonymous
namespace)::ir_constant_variable_visitor::visit_enter (this=0x7fffffff8680,
ir=0x147c470) at glsl/opt_constant_variable.cpp:161
#5  0x00007ffff058962e in ir_call::accept (this=0x147c470, v=0x7fffffff8680) at
glsl/ir_hv_accept.cpp:326
#6  0x00007ffff0588968 in visit_list_elements (v=0x7fffffff8680, l=0x14736c0,
statement_list=true) at glsl/ir_hv_accept.cpp:55
#7  0x00007ffff0588a96 in ir_loop::accept (this=0x14736a0, v=0x7fffffff8680) at
glsl/ir_hv_accept.cpp:89
#8  0x00007ffff0588968 in visit_list_elements (v=0x7fffffff8680, l=0x1471e90,
statement_list=true) at glsl/ir_hv_accept.cpp:55
#9  0x00007ffff058883c in ir_hierarchical_visitor::run (this=0x7fffffff8680,
instructions=0x1471e90) at glsl/ir_hierarchical_visitor.cpp:364
#10 0x00007ffff06937f5 in do_constant_variable (instructions=0x1471e90) at
glsl/opt_constant_variable.cpp:191
#11 0x00007ffff069397a in do_constant_variable_unlinked (instructions=0xc78570)
at glsl/opt_constant_variable.cpp:217
#12 0x00007ffff0559c2d in do_common_optimization (ir=0xc78570, linked=false,
uniform_locations_assigned=false, options=0xcb2120, native_integers=true) at
glsl/glsl_parser_extras.cpp:2243
#13 0x00007ffff0559273 in opt_shader_and_create_symbol_table (ctx=0xcb1160,
source_symbols=0x0, shader=0x11db210) at glsl/glsl_parser_extras.cpp:2010
#14 0x00007ffff05594eb in _mesa_glsl_compile_shader (ctx=0xcb1160,
shader=0x11db210, dump_ast=false, dump_hir=false, force_recompile=true) at
glsl/glsl_parser_extras.cpp:2093
#15 0x00007ffff06a5158 in compile_shaders (ctx=0xcb1160, prog=0x11e92b0) at
glsl/shader_cache.cpp:73
#16 0x00007ffff06a585f in shader_cache_read_program_metadata (ctx=0xcb1160,
prog=0x11e92b0) at glsl/shader_cache.cpp:232
#17 0x00007ffff05c3b4f in link_shaders (ctx=0xcb1160, prog=0x11e92b0) at
glsl/linker.cpp:4879
#18 0x00007ffff0475a05 in _mesa_glsl_link_shader (ctx=0xcb1160, prog=0x11e92b0)
at program/ir_to_mesa.cpp:3160
#19 0x00007ffff02fb9e6 in link_program (no_error=false, shProg=0x11e92b0,
ctx=0xcb1160) at main/shaderapi.c:1206
#20 link_program_error (ctx=0xcb1160, shProg=0x11e92b0) at
main/shaderapi.c:1286
#21 0x00007ffff02fd181 in _mesa_LinkProgram (programObj=16) at
main/shaderapi.c:1778
#22 0x00007ffff55e5254 in compile_program (fslocalp=0x7ffff55f35a0 <fsprogram>)
at shaderplayopengl.c:299
#23 0x00007ffff55e66bd in setup_createprogram (fslocalp=0x7ffff55f35a0
<fsprogram>, root=1) at shaderplayopengl.c:472
#24 0x00007ffff55e3e4e in context_reset () at libretro-shaderplay.c:1660

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