Annotation of www/ddb.html, Revision 1.8
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14: <h2><font color="#e00000">Extracting useful information from kernel crashes</font></h2>
15: <hr>
16:
17: <h3><font color="#0000e0">Minimum information for kernel problems</font></h3>
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1.6 tb 19: Familiarize yourself with
20: <a href="report.html">the general bug reporting procedures</a>
21: first.
22: All of that will apply.
1.1 beck 23: When reporting a kernel panic or crash, please remember:
24:
25: <ul>
1.6 tb 26: <li><em>We need the console output on the screen</em>.
27: Capture it and save it.
28: Serial consoles are best, but if you are on a VGA console you can
29: <a HREF="http://www.openbsd.org/faq/faq7.html">scroll the console back</a>
30: and take readable pictures with a phone or camera.<BR>
31:
32: <li><em>If the kernel panicked we need the traceback.</em>
33: It may be displayed on the screen.
34: If you are at a
1.8 ! sthen 35: <tt><a href="http://man.openbsd.org/?query=ddb&sektion=4&">ddb</a>></tt>
1.6 tb 36: prompt, type <tt>trace</tt>.
37: If you are running SMP, use the <tt>mach ddbcpu N</tt> command for each
38: of the <tt>N</tt> processors you have and repeat the <tt>trace</tt>
39: command for each processor.<BR>
1.1 beck 40:
1.6 tb 41: <li><em>We need the process list.</em>
42: Use the command <tt>ps</tt> to get us that.
1.1 beck 43: </ul>
44:
1.6 tb 45: <em>
46: Reports without the above information are useless.
47: This is the minimum we need to be able to track down the issue.
48: </em>
1.1 beck 49:
50: <h3><font color="#0000e0">Additional information you can send</font></h3>
51: <P>
1.6 tb 52: In some situations more information is desirable.
53: Below are outlined some additional steps you can take in certain situations:
1.1 beck 54: <ul>
1.3 beck 55: <li> ... XXX boot crash? XXX
56: <li> ... XXX show regs? XXX
1.6 tb 57: <li> <em>If your crash appears to involve filesystems.</em>
58: The following additional things would be helpful
1.3 beck 59: <ul>
1.6 tb 60: <li> The output of the
1.8 ! sthen 61: <tt><a href="http://man.openbsd.org/?query=ddb&sektion=4&">ddb</a>></tt>
1.6 tb 62: command <tt>show uvm</tt>
63: <li> The output of the
1.8 ! sthen 64: <tt><a href="http://man.openbsd.org/?query=ddb&sektion=4&">ddb</a>></tt>
1.6 tb 65: command <tt>show bcstats</tt>
66: <li> The output of the <tt>mount</tt> command from your running machine,
67: so we know what filesystems are mounted and how.
1.3 beck 68: </ul>
1.6 tb 69: <li> <em>If your crash appears to involve hibernate/resume.</em> XXX
1.3 beck 70: </li>
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1.1 beck 72: </ul>
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