Re: kern/46885: NetBSD 6.0_RC1 spontaneously reboots as kernel starts to load

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Sat, Sep 01, 2012 at 11:13:44PM +0200, Manuel Bouyer wrote:
> I can confirm this on a DELL optiplex with a "Intel(R) Celeron(R) CPU 
> 2.80GHz".
> 
> 
> > [...]
> > Compiling a kernel with options DIAGNOSTIC commented out and options DEBUG
> > uncommented and testing that works perfectly as well!
> 
> I looked at low-level code that would have
> #if defined(DIAGNOSTIC) || defined(DEBUG)
> but didn't spot anything (the only file I found in i386 and x86 which
> have something like that is apmcall.S, which is not compiled in).

I did some experiments:
- a kernel with the files from i386/i386 and *acpi*.o compiled -DDEBUG
  hangs instead of resetting
- a kernel with kern_*.o,  *acpi*.o and uvm*.o compiled with -DDEBUG
  (and everything else without -DDEBUG) resets just after the first line
  of green message (which I think is about symbols, but it resets too fast
  to really be sure)
- a kernel with everything but kern_*.o,  *acpi*.o and uvm*.o compiled with
  -DDEBUG boots

So, at first glance, it looks like DEBUG or DIAGNOSTIC doesn't make it
work because it changes code, but because it changes sizes.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--