That's because in sys/arch/i386/i386/pmap.c it only calls panic() in
pmap_zero_page_uncached if DIAGNOSTIC is defined.

from pmap.c:
#ifdef DIAGNOSTIC
	if (*zero_ptr)
		panic("pmap_zero_page_uncached: lock botch");
#endif

If I'm wrong, please somebody correct me, but from what I understand
this checks to see if the page was actually zero'd. If not (*zero_ptr is
non-zero), then it panics. This doesn't get checked unless DIAGNOSTIC is
defined.

Jared

On 14 Jul 2000, Bruce Anderson wrote:

> Date: 14 Jul 2000 15:12:28 -0500 
> From: Bruce Anderson <brucea@spacestar.net>
> To: Port-i386 <port-i386@netbsd.org>
> Subject: Re: 1.5 ALPHA on Cyrix
> 
> options DIAGNOSTIC  causes my Cyrix MII to panic.
> 
> I have two kernels here both compiled minus options DIAGNOSTIC,
> one with options DEBUG and one without any debugging code.
> Both are rock solid.
> 
> 
> On Fri, Jul 14, 2000 8:11 AM, Jared D. McNeill
> <mailto:jmcneill@invisible.yi.org> wrote:
> >This has been happening for quite a while; not only on M1's but on MII's
> >as well. I'm suprised it hasn't been fixed yet.
> >
> >If I remember correctly, this should fix it:
> >	sys/arch/i386/i386/pmap.c:
> >		Comment out all calls to pmap_zero_page()
> >	sys/arch/i386/include/pmap.h:
> >		Comment out the definition for PMAP_PAGEIDLEZERO()
> >
> >All I did was disable the in-kernel debugger, so I'm not seeing the
> >panics. I don't know if they're still happening or not; that's why
> >solution 1 is probably the best route.
> >
> >Hope this helps,
> >
> >Jared
> >
> >On Fri, 14 Jul 2000, Jukka Marin wrote:
> >
> >> Date: Fri, 14 Jul 2000 13:58:02 +0300
> >> From: Jukka Marin <jmarin@pyy.jmp.fi>
> >> To: Port-i386 <port-i386@netbsd.org>
> >> Subject: 1.5 ALPHA on Cyrix
> >> 
> >> A kernel built from 000713 sources still causes those annoying page
> >> fault traps on Cyrix CPU's (Stopped at pmap_zero_page_uncached+0x48:
> >> repe stosl %es:(%edi)).
> >> 
> >> Not as often as some older versions, but it still occurs at least once
> >> during every reboot on my P166+.
> >> 
> >>   -jm
> >> 
> >> 
> >
> 
> 
> 
> 
> 
> " Stamp out root login's .  .  .  . su "   --Bruce Anderson  
>  This message was created and sent using Cyberdog 2.0, MacOS 8.6,
>  awk, find, sed, sendmail, sh, and NetBSD a free Multi-Platform OS.
> 
> 
> 
> 
>