[Bug 83515] New: [SNB+]Piglit spec_EXT_shader_integer_mix_execution_fs-mix-if-bool crash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83515

          Priority: medium
            Bug ID: 83515
          Assignee: idr at freedesktop.org
           Summary: [SNB+]Piglit
                    spec_EXT_shader_integer_mix_execution_fs-mix-if-bool
                    crash
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: Drivers/DRI/i965
           Product: Mesa

System Environment:
--------------------------
Platform: SNB
Libdrm:    (master)libdrm-2.4.56-21-g8c2ae1695913990cbe6c6a8aa294f354eba33bd0
Mesa:    (master)504f5f9d1a4fb5a0ddc8a5d0bf73fd6eba96b1d0
Xserver:(master)xorg-server-1.16.0-152-g3a51418b2db353519a1779cf3cebbcc9afba2520
Xf86_video_intel:(master)2.99.914-89-gaa10f480c566b8523cdd49b3e23f64b7b9625987
Libva:    (master)c356638098e55453d2fac8bbb92eafc8cc32d6f4
Libva_intel_driver:(master)865f288d6821dfea5a9dc2a0525eba69ef786b23
Kernel:   (drm-intel-nightly)4144c90b76dfe6eaa2205ac947090786b5091cff

Bug detailed description:
---------------------------
It crash on SNB+ platforms with mesa 10.3 branch and SNB with mesa master
branch.
It works well on IVB+ with mesa master branch.

It's a new case.
spec_EXT_shader_integer_mix_execution_vs-mix-if-bool also has this issue.

output:
Segmentation fault (core dumped)

(gdb) bt
#0  exec_list_push_tail (n=0x810957c, list=0xbfffe4f8) at
../../../../../src/glsl/list.h:439
#1  push_tail (n=0x810957c, this=0xbfffe4f8) at
../../../../../src/glsl/list.h:567
#2  emit (inst=0x810957c, this=0xbfffe4d8) at brw_fs_visitor.cpp:2759
#3  fs_visitor::resolve_ud_negate (this=this at entry=0xbfffe4d8,
reg=reg at entry=0xbfffe520) at brw_fs_visitor.cpp:3230
#4  0xb79af119 in resolve_ud_negate (reg=0xbfffe520, this=0xbfffe4d8) at
brw_fs_visitor.cpp:2262
#5  fs_visitor::emit_bool_to_cond_code (this=0x10001, ir=0x0) at
brw_fs_visitor.cpp:2259
#6  0xb79afa01 in exec_list_get_tail (list=0x20) at
../../../../../src/glsl/list.h:407
#7  get_tail (this=0x20) at ../../../../../src/glsl/list.h:552
#8  fs_visitor::visit (this=0x70001, ir=0x0) at brw_fs_visitor.cpp:1109
#9  0xb79afe01 in fs_visitor::visit (this=0x0, ir=0x0) at
brw_fs_visitor.cpp:2534
#10 0x00000000 in ?? ()


Reproduce steps:
-------------------------
1. xinit
2. bin/shader_runner
tests/spec/ext_shader_integer_mix/execution/fs-mix-if-bool.shader_test -auto

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