[Bug 100587] [BXT/GLK]gem_mmap_gtt/coherency failing assertion cpu[x] == i

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100587

maria guadalupe <maria.g.perez.ibarra at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 platform|                            |GLK
            Summary|[BXT]gem_mmap_gtt/coherency |[BXT/GLK]gem_mmap_gtt/coher
                   |failing assertion cpu[x] == |ency failing assertion
                   |i                           |cpu[x] == i

--- Comment #4 from maria guadalupe <maria.g.perez.ibarra at intel.com> ---
(In reply to Chris Wilson from comment #3)
> (In reply to Elio from comment #2)
> > is this the same case for gem_mmap_gtt at swap* as well?
> 
> Is a completely different class of bug, it should fail exactly like #100585.

this issue happening over GLK. is this expected ? 

output
==============================
./gem_mmap_gtt --r coherency --debug
IGT-Version: 1.18-g56741ce (x86_64) (Linux:
4.11.0-rc4-drm-tip-qa-ww13-commit-5c                                           
                                                                 7479a+ x86_64)
(gem_mmap_gtt:1736) drmtest-DEBUG: Test requirement passed: !(fd<0)
(gem_mmap_gtt:1736) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/de                                                                
                                            bug/dri/0'
(gem_mmap_gtt:1736) igt-core-DEBUG: Starting subtest: coherency
(gem_mmap_gtt:1736) DEBUG: Test requirement passed: igt_setup_clflush()
(gem_mmap_gtt:1736) CRITICAL: Test assertion failure function test_coherency,
fi                                                                             
                               le gem_mmap_gtt.c:336:
(gem_mmap_gtt:1736) CRITICAL: Failed assertion: cpu[x] == i
(gem_mmap_gtt:1736) CRITICAL: error: 0 != 64
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [__real_main773+0x13b1]
  #2 [<unknown>+0x13b1]
  #3 [<unknown>+0x13b1]
  #4 [<unknown>+0x13b1]
Subtest coherency failed.
**** DEBUG ****
(gem_mmap_gtt:1736) DEBUG: Test requirement passed: igt_setup_clflush()
(gem_mmap_gtt:1736) CRITICAL: Test assertion failure function test_coherency,
fi                                                                             
                               le gem_mmap_gtt.c:336:
(gem_mmap_gtt:1736) CRITICAL: Failed assertion: cpu[x] == i
(gem_mmap_gtt:1736) CRITICAL: error: 0 != 64
****  END  ****
Subtest coherency: FAIL (0.020s)

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