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Subject: DHCP 4.3.0 - "Impossible condition" when process exits.
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From: Dan McDonald <danmcd@omniti.com>
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<h3>Bug Report from www.isc.org:</h3>
<ul>
<li><strong>Name:</strong> Dan McDonald</li>
<li><strong>Email:</strong> danmcd@omniti.com</li>
<li><strong>Software Version:</strong> DHCP 4.3.0</li>
<li><strong>OS:</strong> OmniOS (an illumos distro)</li>
<li><strong>Subject:</strong>&quot;Impossible condition&quot; when process exits.</li>
</ul>
<h4>Bug Detail</h4>
<p>See https://lists.isc.org/pipermail/dhcp-hackers/2014-May/002086.html, and the two follow up messages.</p>
<p>Basically, if_deregister_receive() checks the &quot;wfdesc&quot; socket, even though that is the &quot;write&quot; file descriptor.  It has been set to -1 by the if_deregister_send() function, called earlier.</p>
<p>Serghei Samsi suggests removing the check for wfdesc out of if_deregister_send().</p>
<p>---</p>
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