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      <base href="https://bugzilla.gnome.org/" />
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      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [Wayland] Crash under gdk_wayland_window_attach_image()"
   href="https://bugzilla.gnome.org/show_bug.cgi?id=773274#c27">Comment # 27</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [Wayland] Crash under gdk_wayland_window_attach_image()"
   href="https://bugzilla.gnome.org/show_bug.cgi?id=773274">bug 773274</a>
              from <span class="vcard"><a href="page.cgi?id=describeuser.html&login=stransky%40redhat.com" title="Martin Stransky <stransky@redhat.com>"> <span class="fn">Martin Stransky</span></a>
</span></b>
        <pre>There's a backtrace:

</pre>
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  <a class="trace_toggle_box" href="#"
     title="Expand/Collapse Trace"
     onclick="traceparser_toggle_trace(this, 238372); return false;">+</a>
  <a href="page.cgi?id=traceparser/trace.html&trace_id=238372">Trace
    238372</a></p>

<table border="0" cellpadding="0" cellspacing="0"><tr><td>
<div class="trace  bz_default_hidden"
     id="trace_238372">


      <ul class="frames">
          <li class="frame ">
              <span class="frame_number">#0</span>
            <span class="frame_function">__GI___nanosleep</span>
              <div class="frame_file_container">
                at <span class="frame_file">../sysdeps/unix/sysv/linux/nanosleep.c</span>
                  line
                  <span class="frame_line">27</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#1</span>
            <span class="frame_function">__sleep</span>
              <div class="frame_file_container">
                at <span class="frame_file">../sysdeps/posix/sleep.c</span>
                  line
                  <span class="frame_line">55</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#2</span>
            <span class="frame_function">ah_crap_handler(int)</span>
              <div class="frame_file_container">
                at <span class="frame_file">/home/komat/tmp676-trunk-gtk3/src1/toolkit/xre/nsSigHandlers.cpp</span>
                  line
                  <span class="frame_line">102</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#3</span>
            <span class="frame_function">nsProfileLock::FatalSignalHandler(int, siginfo_t*, void*)</span>
              <div class="frame_file_container">
                at <span class="frame_file">/home/komat/tmp676-trunk-gtk3/src1/toolkit/profile/nsProfileLock.cpp</span>
                  line
                  <span class="frame_line">187</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#4</span>
            <span class="frame_function">js::UnixExceptionHandler(int, siginfo_t*, void*)</span>
              <div class="frame_file_container">
                at <span class="frame_file">/home/komat/tmp676-trunk-gtk3/src1/js/src/ds/MemoryProtectionExceptionHandler.cpp</span>
                  line
                  <span class="frame_line">263</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#5</span>
            <span class="frame_function">WasmFaultHandler(int, siginfo_t*, void*)</span>
              <div class="frame_file_container">
                at <span class="frame_file">/home/komat/tmp676-trunk-gtk3/src1/js/src/wasm/WasmSignalHandlers.cpp</span>
                  line
                  <span class="frame_line">1459</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#6</span>
            <span class="frame_function"><signal handler called></span>
          </li>
          <li class="frame ">
              <span class="frame_number">#7</span>
            <span class="frame_function">wl_proxy_marshal</span>
          </li>
          <li class="frame ">
              <span class="frame_number">#8</span>
            <span class="frame_function">wl_surface_attach</span>
              <div class="frame_file_container">
                at <span class="frame_file">/usr/include/wayland-client-protocol.h</span>
                  line
                  <span class="frame_line">3446</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#9</span>
            <span class="frame_function">gdk_wayland_window_attach_image</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow-wayland.c</span>
                  line
                  <span class="frame_line">755</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#10</span>
            <span class="frame_function">gdk_window_impl_wayland_end_paint</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow-wayland.c</span>
                  line
                  <span class="frame_line">925</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#11</span>
            <span class="frame_function">gdk_window_end_paint_internal</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow.c</span>
                  line
                  <span class="frame_line">3021</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#12</span>
            <span class="frame_function">gdk_window_end_draw_frame</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow.c</span>
                  line
                  <span class="frame_line">3289</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#13</span>
            <span class="frame_function">gtk_widget_render</span>
              <div class="frame_file_container">
                at <span class="frame_file">gtkwidget.c</span>
                  line
                  <span class="frame_line">17522</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#14</span>
            <span class="frame_function">gtk_main_do_event</span>
              <div class="frame_file_container">
                at <span class="frame_file">gtkmain.c</span>
                  line
                  <span class="frame_line">1834</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#15</span>
            <span class="frame_function">_gdk_event_emit</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkevents.c</span>
                  line
                  <span class="frame_line">73</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#16</span>
            <span class="frame_function">_gdk_window_process_updates_recurse_helper</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow.c</span>
                  line
                  <span class="frame_line">3852</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#17</span>
            <span class="frame_function">_gdk_window_process_updates_recurse</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow.c</span>
                  line
                  <span class="frame_line">3909</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#18</span>
            <span class="frame_function">gdk_window_impl_process_updates_recurse</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindowimpl.c</span>
                  line
                  <span class="frame_line">333</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#19</span>
            <span class="frame_function">gdk_window_process_updates_internal</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow.c</span>
                  line
                  <span class="frame_line">3998</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#20</span>
            <span class="frame_function">gdk_window_process_updates_with_mode</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow.c</span>
                  line
                  <span class="frame_line">4192</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#21</span>
            <span class="frame_function">gdk_window_paint_on_clock</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkwindow.c</span>
                  line
                  <span class="frame_line">11699</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#25</span>
            <span class="frame_function"><emit signal ??? on instance 0x7f1ffbc93a90 [GdkFrameClockIdle]></span>
              <div class="frame_file_container">
                at <span class="frame_file">gsignal.c</span>
                  line
                  <span class="frame_line">3447</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#26</span>
            <span class="frame_function">_gdk_frame_clock_emit_paint</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkframeclock.c</span>
                  line
                  <span class="frame_line">640</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#27</span>
            <span class="frame_function">gdk_frame_clock_paint_idle</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdkframeclockidle.c</span>
                  line
                  <span class="frame_line">430</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#28</span>
            <span class="frame_function">gdk_threads_dispatch</span>
              <div class="frame_file_container">
                at <span class="frame_file">gdk.c</span>
                  line
                  <span class="frame_line">743</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#29</span>
            <span class="frame_function">g_timeout_dispatch</span>
              <div class="frame_file_container">
                at <span class="frame_file">gmain.c</span>
                  line
                  <span class="frame_line">4615</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#30</span>
            <span class="frame_function">g_main_dispatch</span>
              <div class="frame_file_container">
                at <span class="frame_file">gmain.c</span>
                  line
                  <span class="frame_line">3142</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#31</span>
            <span class="frame_function">g_main_context_dispatch</span>
              <div class="frame_file_container">
                at <span class="frame_file">gmain.c</span>
                  line
                  <span class="frame_line">3795</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#32</span>
            <span class="frame_function">g_main_context_iterate</span>
              <div class="frame_file_container">
                at <span class="frame_file">gmain.c</span>
                  line
                  <span class="frame_line">3868</span>
              </div>
          </li>
          <li class="frame ">
              <span class="frame_number">#33</span>
            <span class="frame_function">g_main_context_iteration</span>
              <div class="frame_file_container">
                at <span class="frame_file">gmain.c</span>
                  line
                  <span class="frame_line">3929</span>
              </div>
          </li>
      </ul>
</div>
</td></tr></table>
<pre class="bz_comment_text" >

It comes from expose event at gtkmain.c:

1832        case GDK_EXPOSE:
1833          if (event->any.window)
1834            gtk_widget_render (event_widget, event->any.window,
event->expose.region);
1835          break;</pre>
        </div>
      </p>
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