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Date:      Thu, 2 Dec 1999 11:13:36 -0500 (EST)
From:      Zhihui Zhang <zzhang@cs.binghamton.edu>
To:        Colin Campbell <sgcccdc@citec.qld.gov.au>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: kernel debugging and page faults
Message-ID:  <Pine.GSO.3.96.991202110420.8946A-100000@sol.cs.binghamton.edu>
In-Reply-To: <Pine.LNX.4.10.9912021124570.2273-100000@guru.citec.qld.gov.au>

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On Thu, 2 Dec 1999, Colin Campbell wrote:

> Hi,
> 
> We are getting an unacceptbale number of "panic: page fault" reboots. I am
> assuming the problem is hardware (seems to be the consensus from the
> archives) but to investigate further I have enabled core dumps etc. When I
> try a "gdb -k" here's what happens:
> 
> # gdb -k /sys/compile/MYKERNEL/kernel vmcore.4 
> GNU gdb 4.18
> Copyright 1998 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you
> are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for
> details.
> This GDB was configured as "i386-unknown-freebsd"...
> IdlePTD 2588672
> 
> kernel symbol `gd_curpcb' not found.
> (kgdb) where
> No stack.
> (kgdb) q
> 
> Is this a gdb (version) problem or what? The archives revealed two people
> asking this question and no answers.
> 
I am no expert on this.  I did the same thing on  FreeBSD 3.2-release and
saw the same thing.  I repeat the process on FreeBSD 3.3-Release,
everything works fine.  I searched the archives, someone posted a message
saying that there is a bug in gdb in FreeBSD 3.2-Release.

-Zhihui



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