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    <head>
      <base href="https://bugs.freedesktop.org/">
    </head>
    <body><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> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [CI][BAT]: igt@i915_selftest@live_hangcheck - timeout - list_add corruption. next->prev should be prev (ffff888405f2c430), but was ffff88848d9492c0. (next=ffff88848d94b480)."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=111397">bug 111397</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>FIXED
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [CI][BAT]: igt@i915_selftest@live_hangcheck - timeout - list_add corruption. next->prev should be prev (ffff888405f2c430), but was ffff88848d9492c0. (next=ffff88848d94b480)."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=111397#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [CI][BAT]: igt@i915_selftest@live_hangcheck - timeout - list_add corruption. next->prev should be prev (ffff888405f2c430), but was ffff88848d9492c0. (next=ffff88848d94b480)."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=111397">bug 111397</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 f130b712ff259f03feaf7a245e3464e3faad89ae (HEAD -> drm-intel-next-queued,
drm-intel/for-linux-next, drm-intel/drm-intel-next-queued)
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date:   Tue Aug 13 21:09:05 2019 +0100

    drm/i915: Serialise read/write of the barrier's engine

    We use the request pointer inside the i915_active_node as the indicator
    of the barrier's status; we mark it as used during
    i915_request_add_active_barriers(), and search for an available barrier
    in reuse_idle_barrier(). That check must be carefully serialised to
    ensure we do use an engine for the barrier and not just a random
    pointer. (Along the other reuse path, we are fully serialised by the
    timeline->mutex.) The acquisition of the barrier itself is ordered through
    the strong memory barrier in llist_del_all().

    Bugzilla: <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [CI][BAT]: igt@i915_selftest@live_hangcheck - timeout - list_add corruption. next->prev should be prev (ffff888405f2c430), but was ffff88848d9492c0. (next=ffff88848d94b480)."
   href="show_bug.cgi?id=111397">https://bugs.freedesktop.org/show_bug.cgi?id=111397</a>
    Fixes: d8af05ff38ae ("drm/i915: Allow sharing the idle-barrier from other
kernel requests")
    Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
    Reviewed-by: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>>
    Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20190813200905.11369-1-chris@chris-wilson.co.uk">https://patchwork.freedesktop.org/patch/msgid/20190813200905.11369-1-chris@chris-wilson.co.uk</a></pre>
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