Date: Tue, 17 Sep 2002 11:04:43 -0700 From: Peter Wemm <peter@wemm.org> To: Nate Lawson <nate@root.org> Cc: Martin Blapp <mb@imp.ch>, current@freebsd.org Subject: Re: Crashdumps available for download ... please help Message-ID: <20020917180443.0C6B62A7D6@canning.wemm.org> In-Reply-To: <Pine.BSF.4.21.0209171014370.40800-100000@root.org>
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Nate Lawson wrote:
> On Tue, 17 Sep 2002, Martin Blapp wrote:
> > Hope this helps people. After I've disabled the secondlevel
> > CPU cache, the panic is now always at the same place:
> >
> > 0xc02fd315 is in pmap_remove_pages (/usr/src/sys/i386/i386/pmap.c:2941).
> > 2936 #ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY
> > 2937 pte = vtopte(pv->pv_va);
> > 2938 #else
> > 2939 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va);
> > 2940 #endif
> > 2941 tpte = *pte;
> > 2942
> > 2943 if (tpte == 0) {
> > 2944 printf("TPTE at %p IS ZERO @ VA %08x\n",
> > 2945 pte, pv->pv_va);
>
> Try building your kernel with "options PMAP_REMOVE_PAGES_CURPROC_ONLY" and
> see if the panic goes away. If that works, the problem is
> pmap_pte_quick().
The problem is that this is hardwired.. line 2902 of pmap.c is:
#define PMAP_REMOVE_PAGES_CURPROC_ONLY
ie: we always use vtopte(), not pmap_pte_quick().
> In looking at pmap_pte_quick, either it is wrong or line 2941 is wrong in
> always dereferencing pte. pmap_pte_quick can return NULL (well 0). It
> seems like pmap_pte_quick is wrong because vtopte() never returns NULL,
> just (PTmap + i386_btop(va)) i.e. a valid base plus some offset.
>
> -Nate
>
> > Kernelfile:
> >
> > http://people.freebsd.org/~mbr/crashes/kernel.debug.bz2 (8 Mb)
> >
> > Kernelconfig:
> >
> > http://people.freebsd.org/~mbr/crashes/kernel.CONFIG
> >
> > Cores:
> >
> > http://people.freebsd.org/~mbr/crashes/vmcore.1.bz2 (5 Mb)
> > http://people.freebsd.org/~mbr/crashes/vmcore.2.bz2 (7 Mb)
> > http://people.freebsd.org/~mbr/crashes/vmcore.3.bz2 (26 Mb)
> >
> > Descriptions:
> >
> > http://people.freebsd.org/~mbr/crashes/vmcore.1.txt
> > http://people.freebsd.org/~mbr/crashes/vmcore.2.txt
> > http://people.freebsd.org/~mbr/crashes/vmcore.3.txt
> >
> > Martin
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-current" in the body of the message
> >
>
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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