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<h2><font color="#e00000">Extracting useful information from kernel crashes</font></h2>
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<h3><font color="#0000e0">Minimum information for kernel problems</font></h3>

Familiarize yourself with <a href="reports.html">the general bug reporting procedures</a>
 first. All of that will apply. 

When reporting a kernel panic or crash, please remember:

<ul>
<li><em>We need the console output on the screen</em>. Capture it and
save it. Serial consoles are best, but if you are on a VGA console you
can <a HREF="http://www.openbsd.org/faq/faq7.html">scroll the console
back</a> and take readable pictures with a phone or camera.<BR>

<li><em>If the kernel paniced we need the traceback.</em> It may be
displayed on the screen.  If are at a <tt><a href="http://www.openbsd.org/cgi-bin/man.cgi?query=ddb&amp;sektion=4&amp;format=html">ddb</a>&gt;</tt> prompt, type <tt>trace</tt>, If you are running SMP, use the <tt>mach ddbcpu N</tt> command for each of the <tt>N</tt> processors you have and repeat the <tt>trace</tt> command for each processor.<BR> 

<li><em>We need the process list.</em> Use the command <tt>ps</tt> to get us that. 
</ul>

<em>Reports without the above information are useless. This is the minimum we need to be able to track down the issue.</em>.

<h3><font color="#0000e0">Additional information you can send</font></h3>
<P>
In some situations more information is desirable. Below are outlined some additional steps you can take in certain situations:
<ul>
<li> ... XXX boot crash? XXX
<li> ... XXX show regs? XXX
<li> <em>If your crash appears to involve filesystems</em> The following additional things would be helpful
<ul>
<li> The output of the <tt><a href="http://www.openbsd.org/cgi-bin/man.cgi?query=ddb&amp;sektion=4&amp;format=html">ddb</a>&gt;</tt> command <tt>show uvm</tt>
<li> The output of the <tt><a href="http://www.openbsd.org/cgi-bin/man.cgi?query=ddb&amp;sektion=4&amp;format=html">ddb</a>&gt;</tt> command <tt>show bcstats</tt>
<li> The output of the <tt>mount</tt> command from your running machine, so we know what filesystems are mounted and how. 
</ul>
<li> <em>If you crash appears to involve hibernate/resume</em> XXX
</li>

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