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Revision 1.7, Mon Mar 21 05:46:19 2016 UTC (8 years, 2 months ago) by beck
Branch: MAIN
Changes since 1.6: +3 -3 lines 

change http://www.openbsd.org/cgi-bin/man.cgi to be http://man.openbsd.org
this points stuff to the new place and gets us ready to deprecate the old
place we did this.

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<h2><font color="#e00000">Extracting useful information from kernel crashes</font></h2>
<hr>

<h3><font color="#0000e0">Minimum information for kernel problems</font></h3>

Familiarize yourself with
<a href="report.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 panicked we need the traceback.</em>
	It may be displayed on the screen.
	If you are at a
	<tt><a href="http://man.openbsd.org?query=ddb&amp;sektion=4&amp;">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://man.openbsd.org?query=ddb&amp;sektion=4&amp;">ddb</a>&gt;</tt>
	command <tt>show uvm</tt>
<li> The output of the
	<tt><a href="http://man.openbsd.org?query=ddb&amp;sektion=4&amp;">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 your crash appears to involve hibernate/resume.</em> XXX
</li>

</ul>

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