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Date: Sat, 30 Oct 2010 17:54:57 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Paul B Mahol <onemda@gmail.com>
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Cc: current@freebsd.org
Subject: Re: panic: invalid PDPE on recend amd64
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on 30/10/2010 17:43 Paul B Mahol said the following:
> Hi,
> 
> Booting amd64 kernel panic in pmap_demote_DMAP(): invalid PDPE
> 
> This is on:
> 
> Copyright (c) 1992-2010 The FreeBSD Project.
> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
> 	The Regents of the University of California. All rights reserved.
> FreeBSD is a registered trademark of The FreeBSD Foundation.
> FreeBSD 9.0-CURRENT #1 r214542+ac89f9b: Sat Oct 30 09:40:45 UTC 2010
>     root@:/usr/obj/usr/src/sys/kernel i386
----------------------------------------^^^^
amd64 or i386?

> CPU: Intel(R) Core(TM)2 CPU         T5500  @ 1.66GHz (1662.54-MHz 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0x6f2  Family = 6  Model = f  Stepping = 2
>   Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>   Features2=0xe3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM>
>   AMD Features=0x20100000<NX,LM>
>   AMD Features2=0x1<LAHF>
>   TSC: P-state invariant
> real memory  = 2147483648 (2048 MB)
> avail memory = 2087346176 (1990 MB)
> ACPI APIC Table: <HP     30A2    >
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> FreeBSD/SMP: 1 package(s) x 2 core(s)
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  1
> ioapic0: Changing APIC ID to 1
> ioapic0 <Version 2.0> irqs 0-23 on motherboard
> acpi0: <HPQOEM SLIC-MPC> on motherboard
> acpi0: Power Button (fixed)
> acpi0: reservation of 0, a0000 (3) failed

It seems that the panic happens at the stage where you should be able to enter
ddb and obtain a backtrace at the very least, after adding DDB option to your
kernel.


-- 
Andriy Gapon