[Bug 105064] New: GPU Hang with single-channel RAM configuration

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105064

            Bug ID: 105064
           Summary: GPU Hang with single-channel RAM configuration
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mark.a.janes at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Mesa CI consistently reproduced GPU hangs on a subset of BDWGT3e machines after
updating kernel from 4.9->4.15.

On further investigation, we found that all failing machines had RAM in
single-channel configuration:  4GB in each of slots A1, A2.  This is a valid
(though uncommon) memory configuration.

We have not yet verified if other more common memory configurations (3 slots, 4
slots filled) reproduce the hang.

So far, this is reproducible as far back as 4.13 by running piglit in a loop a
few times.

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