[Bug 83081] New: [BDW Regression]Piglit spec_ARB_sample_shading_builtin-gl-sample-mask_2 is core dumped

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83081

          Priority: high
            Bug ID: 83081
          Assignee: idr at freedesktop.org
           Summary: [BDW Regression]Piglit
                    spec_ARB_sample_shading_builtin-gl-sample-mask_2 is
                    core dumped
        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: bdw
Libdrm:       
(master)libdrm-2.4.56-10-g22b995d8cbf1059535c5de5ba1869c1623ae5b08
Mesa:        (master)306e421887720b149be77c749108bcffcebe34f6
Xserver:   
(master)xorg-server-1.15.99.902-121-g2f5cf9ff9a0f713b7e038636484c77f113a5f10a
Xf86_video_intel:(master)2.99.914-68-gd209b03915e4d12ce445d72ac09bb4fe664ba664
Libva:        (master)acfcd5f0637a951d50c5112c7dfbd46f1d0dcdb3
Libva_intel_driver:(master)f3f49f2f0e6b3669d9b09341a11cf0b96e138674
Kernel:   (drm-intel-nightly)257d90d13794c2eb545ab0d6c708f21e2a0378b6

ug detailed description:
---------------------------
It fails on BDW with mesa master branch, works well on Mesa 10.3 branch.

The latest known bad commit 306e421887720b149be77c749108bcffcebe34f6
The latest known good commit f80c6847e969016596b5ce3202236c15663cc61a
(It has bug 82929, bisect is slow)

output:
FBO attachment = TEXTURE, result = pass
Floating point exception (core dumped)

(gdb) bt
#0  0x00007ffff3d53344 in get_fast_clear_rect (irb=<optimized out>,
rect=0x7fffffffdf50, fb=0x84c330, brw=0x7ffff39d7038) at
brw_meta_fast_clear.c:310
#1  brw_meta_fast_clear (brw=brw at entry=0x7ffff39d7038, fb=fb at entry=0x84c330,
buffers=buffers at entry=256, partial_clear=partial_clear at entry=false) at
brw_meta_fast_clear.c:512
#2  0x00007ffff3d0dc00 in brw_clear (ctx=0x7ffff39d7038, mask=256) at
brw_clear.c:246
#3  0x000000000040185f in test_builtin_sample_mask (ms_fbo=...) at
/GFX/Test/Piglit/piglit/tests/spec/arb_sample_shading/execution/builtin-gl-sample-mask.cpp:191
#4  0x0000000000401ad7 in piglit_display () at
/GFX/Test/Piglit/piglit/tests/spec/arb_sample_shading/execution/builtin-gl-sample-mask.cpp:228
#5  0x00007ffff7d84baa in run_test (gl_fw=0x604010, argc=2,
argv=0x7fffffffe288) at
/GFX/Test/Piglit/piglit/tests/util/piglit-framework-gl/piglit_winsys_framework.c:78
#6  0x00007ffff7d6a205 in piglit_gl_test_run (argc=2, argv=0x7fffffffe288,
config=0x7fffffffe150) at
/GFX/Test/Piglit/piglit/tests/util/piglit-framework-gl.c:151
#7  0x00000000004014cd in main (argc=2, argv=0x7fffffffe288) at
/GFX/Test/Piglit/piglit/tests/spec/arb_sample_shading/execution/builtin-gl-sample-mask.cpp:44

Reproduce steps:
---------------------------- 
1. xinit
2. bin/arb_sample_shading-builtin-gl-sample-mask 2 -auto

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