From owner-freebsd-hackers  Sun May 26  9: 0:31 2002
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Date: Sun, 26 May 2002 17:00:05 +0100
From: Dominic Marks <dominic_marks@btinternet.com>
To: Ceri Davies <setantae@submonkey.net>
Cc: hackers@FreeBSD.org
Subject: Re: Another panic in -STABLE, yesterday's tree
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References: <20020526112641.GA396@submonkey.net> <20020526134812.A64544@host217-39-131-156.in-addr.btop> <20020526153024.GD2271@submonkey.net>
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In-Reply-To: <20020526153024.GD2271@submonkey.net>; from setantae@submonkey.net on Sun, May 26, 2002 at 04:30:24PM +0100
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On Sun, May 26, 2002 at 04:30:24PM +0100, Ceri Davies wrote:
> On Sun, May 26, 2002 at 01:48:12PM +0100, Dominic Marks wrote:
> > On Sun, May 26, 2002 at 12:26:41PM +0100, Ceri Davies wrote:
> > > 
> > > I've had another kernel panic, this time from a cold boot (the machine had
> > > been powered off overnight), with a new world and kernel built yesterday:
> > > 
> > > FreeBSD rhadamanth.private.submonkey.net 4.6-PRERELEASE FreeBSD 4.6-PRERELEASE #0: Wed May  1 21:59:38 BST 2002     setantae@rhadamanth.private.submonkey.net:/usr/obj/usr/src/sys/RHADAMANTH  i386
> > > 
> > > I've attached a backtrace - further information is available if someone
> > > tells how to summon it from gdb (I won't delete vmcore this time...)
> > 
> > I had this problem. To get good backtraces I do the following. I don't
> > know how "good" this method is, but it works for me.
> > 
> > After making your system with makeoptions="-g", add the following to
> > /etc/rc.conf:
> > 
> > savecore_flags="-N /usr/obj/usr/src/sys/GALLIUM/kernel.debug"
> > 
> > Using the correct path for your kernel name. Then, in your crash dump
> > directory (mine is /usr/crash) run gdb -k kernel.N vmcore.N and you
> > should be able to get a good backtrace with symbols.
> 
> That backtrace is from a debug kernel though?
> In my kernel config I have :
> makeoptions     DEBUG=-g                #Build kernel with gdb(1) debug symbols
> 
> and after running "make installkernel" I just
> cp /usr/obj/usr/src/sys/RHADAMANTH/kernel.debug /var/crash
> 
> Is that really not good enough (if not, I'll do it like you've suggested, but
> I don't always keep /usr/obj around) ?

Well, I should have been more clear. You don't need to keep it in
/usr/obj. The following should work just as well.

# cp /usr/obj/..BLAH../kernel.debug /var/debugkernels/

Then modify the savecore flags appropriately. Trying to get it to work
after this point always failed for me. YMMV.

> Thanks,
> 
> Ceri
> 
> -- 
> get the cool shoe shine
> 
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-- 
Dominic

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