[Bug 83082] New: [BDW Regression]Piglit spec_ARB_texture_multisample_sample-position_2 is core dumped

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83082

          Priority: high
            Bug ID: 83082
          Assignee: idr at freedesktop.org
           Summary: [BDW Regression]Piglit
                    spec_ARB_texture_multisample_sample-position_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.
Following cases also fail:
spec_ARB_texture_float_multisample-formats_2_GL_ARB_texture_float
spec_ARB_texture_rg_multisample-formats_2_GL_ARB_texture_rg
spec_ARB_texture_rg_multisample-formats_2_GL_ARB_texture_rg-float
spec_ARB_texture_rg_multisample-formats_2_GL_ARB_texture_rg-int

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

output:
Floating point exception (core dumped)

(gdb) bt
#0  0x00007ffff3d53344 in get_fast_clear_rect (irb=<optimized out>,
rect=0x7fffffffdc80, fb=0xd5c010, brw=0x7ffff39d7038) at
brw_meta_fast_clear.c:310
#1  brw_meta_fast_clear (brw=brw at entry=0x7ffff39d7038, fb=fb at entry=0xd5c010,
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  0x0000000000401a31 in draw_ms_triangle (step=1, axis=0) at
/GFX/Test/Piglit/piglit/tests/spec/arb_texture_multisample/sample-position.c:70
#4  0x0000000000401c59 in piglit_display () at
/GFX/Test/Piglit/piglit/tests/spec/arb_texture_multisample/sample-position.c:125
#5  0x00007ffff7d8326b in run_test (gl_fw=0x604010, argc=2,
argv=0x7fffffffe278) at
/GFX/Test/Piglit/piglit/tests/util/piglit-framework-gl/piglit_fbo_framework.c:52
#6  0x00007ffff7d6a205 in piglit_gl_test_run (argc=2, argv=0x7fffffffe278,
config=0x7fffffffe140) at
/GFX/Test/Piglit/piglit/tests/util/piglit-framework-gl.c:151
#7  0x0000000000401958 in main (argc=2, argv=0x7fffffffe278) at
/GFX/Test/Piglit/piglit/tests/spec/arb_texture_multisample/sample-position.c:46

Reproduce steps:
---------------------------- 
1. xinit
2. bin/arb_texture_multisample-sample-position 2 -fbo -auto

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