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    <head>
      <base href="https://bugs.freedesktop.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - xwl_present_flips_stop: Assertion `xwl_window->present_window == window' failed."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=106930">106930</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>xwl_present_flips_stop: Assertion `xwl_window->present_window == window' failed.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>Wayland
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>major
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>XWayland
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>wayland-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>james@nurealm.net
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>xorg-team@lists.x.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Arch Linux
xorg-server-xwayland 1.20.0-7
kwin 5.13.0-1

Xwayland does not play nicely with kwin_wayland.  In particular, repeated
selection of buttons, for instance the Application Launcher from the Panel,
will eventually result in an Xwayland crash that locks-up the kwin_wayland
keyboard and mouse.

Locking-up kwin_wayland is KDE's problem.  Crashing the Xwayland X server is a
xorg/Wayland problem.

The kwin_wayland log reports:

Xwayland: ../xorg-server-1.20.0/hw/xwayland/xwayland-present.c:520:
xwl_present_flips_stop: Assertion `xwl_window->present_window == window'
failed.

I have seen this on both a dual display laptop with i915/i965 hardware and a
triple display desktop machine with Radeon HD 5570 / Redwood PRO hardware.</pre>
        </div>
      </p>


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