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            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [SNB+ Regression]igt/gem_render_copy_redux sporadically cause system hang"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=84207#c21">Comment # 21</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [SNB+ Regression]igt/gem_render_copy_redux sporadically cause system hang"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=84207">bug 84207</a>
              from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
        <pre>commit e9681366ea9e76ab8f75e84351f2f3ca63ee542c
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date:   Fri Sep 26 10:31:02 2014 +0100

    drm/i915: Do not store the error pointer for a failed userptr registration

    Fixes regression from commit ad46cb533d586fdb256855437af876617c6cf609
    Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
    Date:   Thu Aug 7 14:20:40 2014 +0100

        drm/i915: Prevent recursive deadlock on releasing a busy userptr

    Bugzilla: <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [SNB+ Regression]igt/gem_render_copy_redux sporadically cause system hang"
   href="show_bug.cgi?id=84207">https://bugs.freedesktop.org/show_bug.cgi?id=84207</a>
    Testcase: igt/gem_render_copy_redux
    Testcase: igt/gem_userptr_blits/create-destroy-sync
    Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
    Cc: Jacek Danecki <<a href="mailto:jacek.danecki@intel.com">jacek.danecki@intel.com</a>>
    Cc: "Gong, Zhipeng" <<a href="mailto:zhipeng.gong@intel.com">zhipeng.gong@intel.com</a>>
    Cc: Jacek Danecki <<a href="mailto:jacek.danecki@intel.com">jacek.danecki@intel.com</a>>
    Cc: "Ursulin, Tvrtko" <<a href="mailto:tvrtko.ursulin@intel.com">tvrtko.ursulin@intel.com</a>>
    Cc: <a href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a>
    Reviewed-by: Tvrtko Ursulin <<a href="mailto:tvrtko.ursulin@intel.com">tvrtko.ursulin@intel.com</a>>
    Signed-off-by: Daniel Vetter <<a href="mailto:daniel.vetter@intel.com">daniel.vetter@intel.com</a>>

Note that the commit references both this bugzilla and the new test case from
c12 that qa reported failure for in c17.</pre>
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