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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - PresentPixmap doesn't work with XSync fences, and crashes server"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109218">109218</a>
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<th>Summary</th>
<td>PresentPixmap doesn't work with XSync fences, and crashes server
</td>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Driver/intel
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
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<th>Reporter</th>
<td>yshuiv7@gmail.com
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<p>
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<pre>In an experimental branch of compton, I tried using PresentPixmap with xrender
to achieve tear free display. I discovered that the XSync fence passed to
PresentPixmap never gets triggered, and when I kill compton, the whole server
crashes.
I don't have a stack trace, but X server crashed in a function called
AttendClient trying to dereference 0x28.
Maybe intel driver only supports fences created via DRI3FenceFromFD. That
should've been made clear somewhere (where?), and X server definitely shouldn't
crash.</pre>
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