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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Wayland]: Destroying the parent of a subsurface causes _gdk_window_destroy_hierarchy: assertion failed"
href="https://bugzilla.gnome.org/show_bug.cgi?id=775319">775319</a>
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<th>Summary</th>
<td>[Wayland]: Destroying the parent of a subsurface causes _gdk_window_destroy_hierarchy: assertion failed
</td>
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<th>Classification</th>
<td>Platform
</td>
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<th>Product</th>
<td>gtk+
</td>
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<th>Version</th>
<td>3.22.x
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>Normal
</td>
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<th>Component</th>
<td>Backend: Wayland
</td>
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<th>Assignee</th>
<td>gtk-bugs@gtk.org
</td>
</tr>
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<th>Reporter</th>
<td>ofourdan@redhat.com
</td>
</tr>
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<th>QA Contact</th>
<td>gtk-bugs@gtk.org
</td>
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<th>CC</th>
<td>rob@robster.org.uk, wayland-bugs@lists.freedesktop.org
</td>
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<th>Depends on</th>
<td>774475
</td>
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<th>Blocks</th>
<td>774546
</td>
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<tr>
<th>GNOME version</th>
<td>---
</td>
</tr></table>
<p>
<div>
<pre>Description:
Creating a gdk window subsurface with another gdk window as parent generates
critical warnings:
GLib-GObject-WARNING **: invalid (NULL) pointer instance
GLib-GObject-CRITICAL **: g_signal_connect_data: assertion
'G_TYPE_CHECK_INSTANCE (instance)' failed
GLib-GObject-WARNING **: invalid (NULL) pointer instance
GLib-GObject-CRITICAL **: g_signal_connect_data: assertion
'G_TYPE_CHECK_INSTANCE (instance)' failed
Those are coming from _gdk_wayland_display_create_window_impl() because
gdk_window_get_frame_clock() returns NULL.
gdk_window_get_frame_clock() tries to get the frame clock from the toplevel, by
walking the window tree back to the corresponding top level.
Unfortunately, it does so by checking the window_type to be GDK_WINDOW_CHILD
whereas it can also be a GDL_WINDOW_SUBSURFACE now (<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - wayland: gtk+ prevents using subsurfaces if the parent is not root"
href="show_bug.cgi?id=774475">bug 774475</a>).
Since it cannot find the correct toplevel window, it returns NULL as the clock
frame, which then causes the critical warnings in
_gdk_wayland_display_create_window_impl()
Trivial patch to follow.</pre>
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</p>
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