kern/127699: [panic] Fatal trap 12: page fault while in kernel mode

[Volker Werth]

The following reply was made to PR kern/127699; it has been noted by GNATS.

From: Volker Werth <vwe at freebsd.org>
To: Wouter Snels <nospam at ofloo.net>
Cc: bug-followup at freebsd.org
Subject: Re: kern/127699: [panic] Fatal trap 12: page fault while in kernel
 mode
Date: Sun, 05 Oct 2008 00:38:38 +0200

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 Wouter,
 
 please run the attached script and file a followup to the PR (leave
 bug-followup@ in CC).
 
 The script will rebuild the environment of your crashed kernel (load
 your old kernel from /boot/kernel.old and load kld's into address
 space), then will give us the backtrace and some code snippets of the
 faulting code.
 
 I've included three instruction addresses picked from your various panic
 messages.
 
 At least two of them are related to if_stf.ko (judged from their code
 addresses).
 
 Volker
 
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  filename="vmcore.sh"
 
 #!/bin/sh +x
 # automated inspection of vmcore.3, PR kern/127699
 
 cat << EOF | asf -s /boot/kernel.old /tmp/vmcore.txt
 1 4 0xc0400000 91d344 kernel
 2 1 0xc0d1e000 6a32c acpi.ko
 3 1 0xc5772000 3000 if_stf.ko
 EOF
 
 cat << EOF >> /tmp/vmcore.txt
 bt
 list *0xc083b4ac
 list *0xc577373d
 list *0xc576e73d
 quit
 EOF
 
 kgdb /boot/kernel.old/kernel /var/crash/vmcore.3 < /tmp/vmcore.txt
 
 
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