Re: Fatal trap 12: page fault on Acer Chromebook 720 (peppy)

From: Konstantin Belousov <kostikbel_at_gmail.com>
Date: Mon, 20 Aug 2018 18:09:04 +0300
On Mon, Aug 20, 2018 at 12:45:12AM +0200, Michael Gmelin wrote:
> 
> See here for a screenshot (also including the output of "show pte
> 0xfffff80001000000"):
> 
> https://gist.github.com/grembo/78d0f2a100dd4f16775b85a118769658#file-ddb1-png
It is too early for ddb routines to register.
Ok can you try the following debugging patch, to verify my guess ?

diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index 18777d23f09..cd05fdb763f 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
_at__at_ -1052,8 +1052,7 _at__at_ create_pagetables(vm_paddr_t *firstaddr)
 		pd_p = (pd_entry_t *)DMPDkernphys;
 		for (i = 0; i < (NPDEPG * nkdmpde); i++)
 			pd_p[i] = (i << PDRSHIFT) | X86_PG_V | PG_PS | pg_g |
-			    X86_PG_M | X86_PG_A | pg_nx |
-			    bootaddr_rwx(i << PDRSHIFT);
+			    X86_PG_M | X86_PG_A | pg_nx | X86_PG_RW;
 		for (i = 0; i < nkdmpde; i++)
 			pdp_p[i] = (DMPDkernphys + ptoa(i)) | X86_PG_RW |
 			    X86_PG_V;
Received on Mon Aug 20 2018 - 13:09:16 UTC

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