From owner-freebsd-current  Sat Sep 26 00:27:10 1998
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From: John Hay <jhay@mikom.csir.co.za>
Message-Id: <199809260726.JAA06562@zibbi.mikom.csir.co.za>
Subject: Re: Weired top display at smp current kernel from today
In-Reply-To: <199809252024.WAA00593@midten.fast.no> from "Tor.Egge@fast.no" at "Sep 25, 98 10:24:58 pm"
To: Tor.Egge@fast.no
Date: Sat, 26 Sep 1998 09:26:30 +0200 (SAT)
Cc: freebsd-current@FreeBSD.ORG, freebsd-smp@FreeBSD.ORG
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> > Sounds like a bug in the ELF image activator.  It's possible that 
> > something got bent when the corefile writing code went in (waves dead 
> > poultry speculatively).
> 
> It is a bug in cpu_fork().  
> 
> pcb_mpnest should be initialized to 1.
> 
> Index: vm_machdep.c
> ===================================================================
> RCS file: /home/ncvs/src/sys/i386/i386/vm_machdep.c,v
> retrieving revision 1.109
> diff -u -r1.109 vm_machdep.c
> --- vm_machdep.c	1998/08/18 07:46:58	1.109
> +++ vm_machdep.c	1998/09/25 20:22:52
> @@ -636,6 +649,9 @@
>  	 * pcb2->pcb_onfault:	cloned above (always NULL here?).
>  	 */
>  
> +#ifdef SMP
> +	pcb2->pcb_mpnest = 1;
> +#endif
>  #ifdef VM86
>  	/*
>  	 * XXX don't copy the i/o pages.  this should probably be fixed.
> 

This fix it for me. ... This fix seems to be binary format neutral, so
why didn't it happen with an aout /sbin/init?

John
-- 
John Hay -- John.Hay@mikom.csir.co.za

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