[Bug 106848] New: [Not CI][GM45] igt at gem_mmap_gtt@basic-small-bo-tiledx - fail - Failed assertion: memcmp(ptr , tiled_pattern, PAGE_SIZE) == 0 (edit)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106848

            Bug ID: 106848
           Summary: [Not CI][GM45] igt at gem_mmap_gtt@basic-small-bo-tiledx
                    - fail - Failed assertion: memcmp(ptr , tiled_pattern,
                    PAGE_SIZE) == 0 (edit)
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: promarbler14 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Copying from the comment made on bug #102575 to here.

> Pardon my intrusion.
> 
> Running subtest basic-small-bo-tiledX with latest igt-gpu-tools
> (1.22+173+gf560ae5a-1) and drm-tip (4.17rc6+1560+g9d5095539d5f+755171-1)
> yields high failure rates on my GM45: out of 1000 iterations, only 360 are
> successful.
> 
> Neither basic-small-bo-tiledY nor basic-small-bo have any failures with 100
> iterations each.
> 
> Platform:
> Dell Inspiron 1545
> Eagle Lake / Core2Duo (Pentium(R) Dual-Core CPU T4200 @ 2.00GHz) / GMA4500
> LVDS (VGA)
> 
> I tested it out of curiosity to its relation to my other bug. [#103025]

In my own investigation I have found the failure to start between kernels 4.7
and 4.8, making it easy to bisect. I haven't finished the bisect yet, but I
believe there is some relation to the mm's compaction and oom changes that were
made around that time; as I recall, it took quite a bit of time to get those mm
changes working right.

I can have the bisect results within a day.

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