Same problem, new year 2100A machine check

[Tom Ponsford]

Hi All,



Andrew Gallatin wrote:

>  > It DOES NOT boot:
>  > 
>  > FreeBSD 4.xx MP kernel -machine check as it probes PCI/EISA bus
> 
> Interesting.  FreeBSD 4 never supported MP on alpha.

Maybe I got it confused with either the 5.x sources, or maybe even the Netbsd 
source, but I could have sworn there was a options SMP in the config file for 
4.x. Either way it didn't boot smp
> 

> 
> 
> Here are some things to do/try.
> 
> 1) Build a kernel with ddb and get a stack trace.
> When the machine crashes and you land at the "db>" prompt, type 'tr'

I think I did that once before for this list, I think it was a year or so ago. 
Here is the backtrace I posted: It was for then 5.0 current
a smp and uniprocessor kernel did exactly the same thing.

I will build a new 5.2 debug kernel though:
#######################################
FreeBSD/alpha SRM disk boot, Revision 1.2
(root at tomzbox10.tomznet.lan, Tue Oct 29 02:44:25 MST 2002)
Memory 262144 k
Loading /boot/defaults/loader.conf
/boot/kernel/kernel data=0x44bc70+0x672c0 syms=[0x8+0x5ee90+0x8+0x48e16]

Hit {Enter} to boot immediatly, or any other key for command prompt.
Booting [/boot/kernel/kernel]...
Entering /boot/kernel/kernel at 0xfffffc000033e580...
sio1: gdb debugging port
Copyright (c) 1992-2002 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 5.0-CURRENT #0: Wed Nov 6 11:12:40 MST 2002
  root at tomzbox.10.tomznet.lan:/usr/obj/usr/src/sys/TOMZBOX10
Preloaded elf kernel "/boot/kernel/kernel" at 0xfffffc000085e000.
DEC AlphaServer 2100A 4/275, 274MHZ
8192 byte page size, 4 processors.
CPU: EV45 (21064A) major=6 minor=2
OSF PAL rev: 0x4000c0002012d
real memory = 266264576 (260024K bytes)
avail memory = 250675200 (244800K bytes)
Initializing GEOMetry subsystem
t20: using interupt type 1 on pci bus 0
t20: <T2 Core Logic chipset>
pci0 <PCI bus> on pcib0
eisab0: <PCI-EISA bridge> at device 2.0 on pci0
isa0: <ISA bus> on eisab0
pcib1: <PCI-PCI bridge> at device 3.0 on pci0
pci2: <PCI bus> on pcib1

unexpected machine check:
  mces   = 0x1
  vector = 0x660
  param  = 0xfffffc0000006000
  pc     = 0xfffffc000064b888
  ra     = 0xfffffc000064b83c
  curproc= 0xfffffc000075fd50
  pid    = 0, comm = swapper

stopped at  t2_pcib_read_config=0x3e8:   or   zero,s3,v0  <zero=0k
0,s3=0xffffffffffffffff,v0=0x7>

db> trace
t2_pcib_read_config() at t2_pcib_read_config+0x3e8
pcib_read_config() at pcib_read_config+0xcc
pci_read_device() at pci_read_device+0xb4
pci_add_children() at pci_add_children+0xf8
pci_attach() at pci_attach+0xd8
device_probe_and_attach() at device_probe_and_attach+0xc8
bus_generic_attach() at bus_generic_attach+0x28
pcib_attach() at pcib_attach+0x68
device_probe_and_attach() at _device_probe_and_attach+0xc8
bus_generic_attach() at bus_generic_attach+0x28
pci_attach() at pci_attach+0xe4
device_probe_and_attach() at device_probe_and_attach+0xc8
bus_generic_attach() at bus_generic_attach+0x28
device_probe_and_attach() at device_probe_and_attaxh+0xc8
bus_generic_attach() at bus_generic-attach+0x28
t2_attach() at t2_attach+0x6c
device_probe_and-attach() at device_probe_and_attach+0xc8
root_bus_configure() at root_bus_configure+0x38
configure() at configure+0x40
mi_startup() at mi_startup+0x144
locorestart() at locorestart+0x64
--- root of call graph ---

##############################################################



I'll have to dig up an alpha that I can spare thats not running on my VMS lan, 
so It might be a week or two before I can get a new 5.2 backtrace..
> 
> This might not be incredibly helpful because machine checks
> are not synchronous, but it may narrow things down a little bit.

> 2) Disable all but CPU0 from the SRM console.  There's a bitmask
> you can set from SRM (I don't remember off the top of my head what it
> is, but its probably set to 0xfff now).

I'll try it and if that's not the right bitmap, I do have the documentation 
for this beast.
> 
> Drew
> 

Thanks for all the help!!


Tom Ponsford