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().
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
>
>
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