Date: Sat, 25 May 2002 12:30:57 +1200 From: Craig Carey <research@ijs.co.nz> To: freebsd-current@freebsd.org Cc: "Georg-W. Koltermann" <Georg.Koltermann@mscsoftware.com> Subject: Re: reading kernel dump - post gcc 3.1 Message-ID: <5.1.1.2.2.20020525120838.03356390@202.89.128.27> In-Reply-To: <1022244779.4521.96.camel@hunter.muc.macsch.com>
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At 02\05\24 14:52 +0200 Friday, Georg-W. Koltermann wrote:
>Hi,
>
>I got a couple of kernel panics recently, some of them "buffer not
>locked". I would like to know how I can get more information out of the
>dump.
>
>The system's gdb does not like the dump format any more, see also
>bin/38236. There is an advertised workaround in that pr of using gdb52,
>but I couldn't get that to work ("not a core dump: File format not
>recognized").
>
>Am I missing something? How do you guys read your dumps?
>
There are online articles on how to get and read kernel panic dumps, at
these webpages. Also I copy parts views the articles.
http://www.onlamp.com/pub/a/bsd/2002/03/21/Big_Scary_Daemons.html
http://www.onlamp.com/pub/a/bsd/2002/03/21/Big_Scary_Daemons.html?page=2
System Panics, Part 1: Preparing for the Worst (21 March 2002),
by Mr. M. Lucas
Add: options DDB makeoptions DEBUG=-g to config file.
A large enough swap file is needed for the dump.
Specify in /etc/rc.conf: dumpdev="/dev/ad0s4b", the dumpdir may be
specified to be /var/crash.
Read savecore(8).
http://www.onlamp.com/pub/a/bsd/2002/04/04/Big_Scary_Daemons.html
http://www.onlamp.com/pub/a/bsd/2002/04/04/Big_Scary_Daemons.html?page=2
System Panics, Part 2: Recovering and Debugging (4 April 2002)
savecore(8) should copy a dump of the crashed kernel to /var/crash and
created files kernel.0 and vmcore.0.
gdb -k kernel.0 vmcore.0
__
Craig Carey
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