Subject: Re: obscure bug
To: Andrew Brown <>
From: Sean Davis <>
List: tech-kern
Date: 02/21/2003 11:37:32
On Fri, Feb 21, 2003 at 11:13:22AM -0500, Andrew Brown wrote:
> >> >in the currently working fine kernel.
> >> >Any suggestions?
> >> 
> >> try doing a make cleandir and then a make dependall in your kernel
> >> build directory, and then reboot with the resulting kernel.
> >
> >I did that both times. The first time created the broken kernel, the second
> >created the working one, but this one has DDB/DEBUG/etc in it, which I don't
> >want, because they're quite spammy.
> i find ddb is good to have, though you may wish to add ddb.onpanic=0
> to your /etc/sysctl.conf file.
> >> that said...
> >> 
> >> what platform is this?  i386?  what's your securelevel set to before
> >> you startx?  are you using the aperture driver (assuming you're using
> >> i386)?  is your userland in sync with your kernel?  are you booting
> >> from a kernel named /netbsd or do you name new kernels something else
> >> when you boot them for the first time?
> >
> >This is i386, securelevel is 1, and yes I'm using the aperture driver. The
> >kernel name is /netbsd, I keep a known-working one around as netbsd.old
> >(since make install puts the old one in onetbsd) Userland and kernel are in
> >sync as of right now, I was about to build userland when I noticed that
> >startx panic'd the kernel. I'll give it another go around without the debug
> >options, and see what happens.
> try this:
> (1) echo set var securelevel=-1 | gdb --write -x /dev/stdin -batch /netbsd
> (2) comment out the aperture driver in your lkm.conf file
> (3) reboot
> (4) startx
> i'd suggest that once your build completes, and all your include files
> have been rebuilt, that you rebuild the aperture driver.  that has
> fixed things for me in the past.  it really ought to be rebuilt each
> time the kernel version changes, but it manages to work quite well
> most of the time, even if you don't.

I skipped the above, since I've run into problems many times due to forgetting
to rebuild the aperture driver. I rebuilt it, and with the new kernel, things
are fine again. (I have yet to test to see if the LFS bug I noticed is still
there, but thats a seperate issue)

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