[Bug 88817] [BSW ppgtt Regression]igt/gem_reset_stats causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88817

--- Comment #6 from ye.tian <yex.tian at intel.com> ---
Bisected shows: the first bad commit is 180253c7.
It parents commit 84ebd315 is good.

commit 180253c71a9d55352cbad44a02424958320cb618
84ebd31548132e1d9e9014fa08986765b5a20237
Author:     Nick Hoath <nicholas.hoath at intel.com>
AuthorDate: Thu Jan 15 13:10:39 2015 +0000
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Tue Jan 20 12:36:54 2015 +0100

    drm/i915: Subsume intel_ctx_submit_request in to drm_i915_gem_request

    Move all remaining elements that were unique to execlists queue items
    in to the associated request.

    Issue: VIZ-4274

    v2: Rebase. Fixed issue of overzealous freeing of request.
    v3: Removed re-addition of cleanup work queue (found by Daniel Vetter)
    v4: Rebase.
    v5: Actual removal of intel_ctx_submit_request. Update both tail and
postfix
    pointer in __i915_add_request (found by Thomas Daniel)
    v6: Removed unrelated changes

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