>Number:         35507
>Category:       port-i386
>Synopsis:       dmesg garbled / corrupted
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jan 29 00:10:00 +0000 2007
>Originator:     Thomas Feddersen
>Release:        NetBSD 4 beta2
>Organization:
Dipl.-Ing. Thomas Feddersen, Beratender Ingenieur
>Environment:
NetBSD Ximus.feddersen.xx 4.0_BETA2 NetBSD 4.0_BETA2 (GENERIC.MPACPI) #0: Tue Jan 23 00:52:20 UTC 2007  builds@b0.netbsd.org:/home/builds/ab/netbsd-4/i386/200701220000Z-obj/home/builds/ab/netbsd-4/src/sys/arch/i386/compile/GENERIC.MPACPI i386

>Description:
"/var/run/dmesg.boot" is garbled (continous "M^?M^?") at the beginning and at the end, although the messages run legibly over the console screen at boot time. 

The corruption always (after every boot) starts in the line beginning
--> PNP0B00 [AT Real-Time Clo <--

The corresponding entry in /var/log/messages is garbled likewise with characters "ÿÿ". /var/log/messages continues normally with 
--> savecore: no core dump

following is a copy of dmesg.boot-->
M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?
 M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^
 ?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M
 ^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?
 M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^
 ?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 4.0_BETA2 (GENERIC.MPACPI) #0: Tue Jan 23 00:52:20 UTC 2007
	builds@b0.netbsd.org:/home/builds/ab/netbsd-4/i386/200701220000Z-obj/home/builds/ab/netbsd-4/src/sys/arch/i386/compile/GENERIC.MPACPI
multiboot: Information structure flags: 0x000007e7
multiboot: Boot loader: GNU GRUB 0.97
multiboot: Command line: /netbsd 
multiboot: 572 KB lower memory, 1020516 KB upper memory
multiboot: Symbol table at 0xc0a21b98, length 427792 bytes
multiboot: String table at 0xc0a8a2a8, length 410890 bytes
total memory = 997 MB
avail memory = 970 MB
timecounter: Timecounters tick every 10.000 msec
RTC BIOS diagnostic error 80<clock_battery>
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
mainbus0 (root)
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel Core 2 (Merom) (686-class), 1864.88 MHz, id 0x6f6
cpu0: features bfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu0: features bfebfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX>
cpu0: features bfebfbff<FXSR,SSE,SSE2,SS,HTT,TM,SBF>
cpu0: features2 e3bd<SSE3,MONITOR,DS-CPL,VMX,EST,TM2,xTPR>
cpu0: "Intel(R) Core(TM)2 CPU          6300  @ 1.86GHz"
cpu0: I-cache 32 KB 64B/line 8-way, D-cache 32 KB 64B/line 8-way
cpu0: L2 cache 2 MB 64B/line 8-way
cpu0: using thermal monitor 1
cpu0: Enhanced SpeedStep (1340 mV) 1867 MHz
cpu0: unknown Enhanced SpeedStep CPU.
cpu0: using only highest and lowest power states.
cpu0: Enhanced SpeedStep frequencies available (MHz): 1867 1867
cpu0: calibrating local timer
cpu0: apic clock running at 266 MHz
cpu0: 64 page colors
cpu1 at mainbus0: apid 1 (application processor)
cpu1: starting
cpu1: Intel Core 2 (Merom) (686-class), 1864.80 MHz, id 0x6f6
cpu1: features bfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
cpu1: features bfebfbff<PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX>
cpu1: features bfebfbff<FXSR,SSE,SSE2,SS,HTT,TM,SBF>
cpu1: features2 e3bd<SSE3,MONITOR,DS-CPL,VMX,EST,TM2,xTPR>
cpu1: "Intel(R) Core(TM)2 CPU          6300  @ 1.86GHz"
cpu1: I-cache 32 KB 64B/line 8-way, D-cache 32 KB 64B/line 8-way
cpu1: L2 cache 2 MB 64B/line 8-way
cpu1: using thermal monitor 1
cpu1: Enhanced SpeedStep (1340 mV) 1867 MHz
cpu1: unknown Enhanced SpeedStep CPU.
cpu1: using only highest and lowest power states.
cpu1: Enhanced SpeedStep frequencies available (MHz): 1867 1867
ioapic0 at mainbus0 apid 2 (I/O APIC)
ioapic0: pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0
ioapic0: remapped to apic 2
acpi0 at mainbus0: Advanced Configuration and Power Interface
acpi0: using Intel ACPI CA subsystem version 20060217
acpi0: X/RSDT: OemId <INTEL ,DG965WH ,00000629>, AslId <    ,01000013>
acpi0: SCI interrupting at int 9
acpi0: fixed-feature power button present
timecounter: Timecounter "ACPI-Fast" frequency 3579545 Hz quality 1000
ACPI-Fast 24-bit timer
mpacpi: could not get bus number, assuming bus 0
ACPI Object Type 'Processor' (0x0c) at acpi0 not configured
ACPI Object Type 'Processor' (0x0c) at acpi0 not configured
ACPI Object Type 'Processor' (0x0c) at acpi0 not configured
ACPI Object Type 'Processor' (0x0c) at acpi0 not configured
acpibut0 at acpi0 (PNP0C0E): ACPI Sleep Button
PNP0A03 [PCI/PCI-X Host Bridge] at acpi0 not configured
PNP0C02 [Plug and Play motherboard register resources] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0C0F [PCI interrupt link device] at acpi0 not configured
PNP0200 [AT DMA Controller] at acpi0 not configured
PNP0B00 [AT Real-Time CloM^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^
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 ^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?M^?
<--/dmesg.boot




>How-To-Repeat:
Hardware: Intel DG965WHMKR MoBo + Core2Duo E6300 + 1GB KINGSTON (PC2-4200 CL4 240) + 6 SATA drives and one ATAPI DVD

Set up a system like above, boot it and look at 
/var/run/dmesg.boot and 
/var/log/messages

The corruption is the same regardess of the SATA-setting (IDE or AHCI) in BIOS and the resulting driver (piixide0 or ahcisata).

I tried
- NetBSD Live! CD 2007
- ftp://ftp-asim.lip6.fr/outgoing/bouyer/i386/
- ftp://ftp.netbsd.org/pub/NetBSD-daily/HEAD/200611240000Z/iso/i386cd-current.iso
all with basically the same result. The curruption starts at different positions in the file though.

I tried the above builds on different hardware (Siemens primergy C200 + dual PIII + 2GB ECC Registred + 4 SCSI drives and one ATAPI DVD) without the described problem.

>Fix:
The problem does not occur when running a Xen-kernel.
I haven't been able to try an amd64 kernel.