Does not happen with 1.5V kernel.

/Johan

>>>boot -fl s
(boot dkb0.0.0.12.0 -flags s)
block 0 of dkb0.0.0.12.0 is a valid boot block
reading 15 blocks from dkb0.0.0.12.0
bootstrap code read in
base = 1f2000, image_start = 0, image_bytes = 1e00
initializing HWRPB at 2000
initializing page table at 1e4000
initializing machine state
setting affinity to the primary CPU
jumping to bootstrap code

NetBSD/alpha 1.5V FFS Primary Bootstrap
Jumping to entry point...

NetBSD/alpha 1.5V Secondary Bootstrap, Revision 1.11
(root@frau-farbissina.shagadelic.org, Thu May  3 22:24:46 PDT 2001)

VMS PAL rev: 0x1000000010538
OSF PAL rev: 0x100000002012e
Switch to OSF PAL code succeeded.

Boot flags: s
6160752+414960 [92+346728+209580]=0x6cd798

Entering netbsd at 0xfffffc0000301290...
[ using 557368 bytes of netbsd ELF symbol table ]
consinit: not using prom console
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002
    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 1.5ZA (GENERIC) #0: Fri Feb 22 10:27:12 CET 2002
    root@yellowtail.pdc.kth.se:/usr/local/src/obj/sys/arch/alpha/compile/GENERIC
AlphaStation 255/233, 232MHz, s/n 
8192 byte page size, 1 processor.
total memory = 160 MB
(2000 KB reserved for PROM, 158 MB used by NetBSD)
avail memory = 139 MB
using 1024 buffers containing 8192 KB of memory
mainbus0 (root)
cpu0 at mainbus0: ID 0 (primary), 21064A-0
cpu0: Architecture extensions: 6<CIX,FIX>
apecs0 at mainbus0: DECchip 21072 Core Logic chipset
apecs0: DC21071-CA pass 2, 128-bit memory bus
apecs0: DC21071-DA pass 2
pci0 at apecs0 bus 0
pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
siop0 at pci0 dev 6 function 0: Symbios Logic 53c810a (fast scsi)
siop0: interrupting at isa irq 11
scsibus0 at siop0: 8 targets, 8 luns per target
sio0 at pci0 dev 7 function 0: Intel 82378ZB System I/O (SIO) (rev. 0x43)
fxp0 at pci0 dev 11 function 0: i82559 Ethernet, rev 8
fxp0: interrupting at isa irq 5
fxp0: Ethernet address 00:d0:b7:bd:10:52
inphy0 at fxp0 phy 1: i82555 10/100 media interface, rev. 4
inphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
siop1 at pci0 dev 12 function 0: Symbios Logic 53c875 (ultra-wide scsi)
siop1: using on-board RAM
siop1: interrupting at isa irq 9
scsibus1 at siop1: 16 targets, 8 luns per target
de0 at pci0 dev 14 function 0
de0: interrupting at isa irq 5
de0: DEC 21040 [10Mb/s] pass 2.4
de0: address 00:00:f8:21:d3:33
isa0 at sio0
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
lpt0 at isa0 port 0x3bc-0x3bf irq 7
pcppi0 at isa0 port 0x61
midi0 at pcppi0: PC speaker
spkr0 at pcppi0
isabeep0 at pcppi0
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
mcclock0 at isa0 port 0x70-0x71: mc146818 or compatible
      Processor Machine Check (660), Code 0x100000205
CPU state:
        PAL temp[0-1]           = 0x          93eb38 0x     2f800000004
        PAL temp[2-3]           = 0x               1 0xfffffe0000079c20
        PAL temp[4-5]           = 0x               0 0xfffffc00006f5c20
        PAL temp[6-7]           = 0x            4200 0x             400
        PAL temp[8-9]           = 0x               3 0xfffffc00003003c0
        PAL temp[10-11]         = 0x               0 0xfffffc0000300360
        PAL temp[12-13]         = 0xfffffc00003003ec 0xfffffc0000300484
        PAL temp[14-15]         = 0xfffffc000030041c 0xfffffc0000300390
        PAL temp[16-17]         = 0xfffffe000000a000 0x               0
        PAL temp[18-19]         = 0xfffffc00001f5a48 0xfffffc00008c10f0
        PAL temp[20-21]         = 0x        200200f0 0x  505070727a7a7a
        PAL temp[22-23]         = 0x              80 0x               0
        PAL temp[24-25]         = 0x           10000 0x               1
        PAL temp[26-27]         = 0x               0 0x          236000
        PAL temp[28-29]         = 0xfffffffc00000000 0xfffffc00006e8b40
        PAL temp[30-31]         = 0x          1f2000 0xfffffc00006c00ba
        Excepting Instruction Addr = 0x0000000000000000
        Summary of arithmetic traps = 0x0000000000000000
        Exception mask            = 0x000002f800000004
        ICCSR                     = 0x0000000000014000
        Base address for PALcode  = 0x00000000000004f0
        HIER                      = 0x0000000000000000
        HIRR                      = 0x0000000000005821
        MM_CSR                    = 0x0000000000000003
        DC_STAT                   = 0x00000007ffffffff
        DC_ADDR                   = 0x000000000000942e
        ABOX_CTL                  = 0x0000000000000041
        Bus Interface Unit status = 0x0000000244220020
        Bus Interface Unit addr   = 0x0000000810002225
        Bus Interface Unit control = 0x0000000000000000
        Fill Syndrome             = 0x0000000000019770
        Fill Address              = 0x0000000000006170
        Effective VA              = 0x0000000150000157
        BC_TAG                    = 0x00000000225f00b4

Cache and Memory Controller (21071-CA) state:
        COMA_GCR                  = 0x00000000225f2000
        COMA_EDSR                 = 0x00000000225f3ff0
        COMA_TER                  = 0x00000000225f0000
        COMA_ELAR                 = 0x00000000225f0a40
        COMA_EHAR                 = 0x00000000225f2fd0
        COMA_LDLR                 = 0x00000000225f000a
        COMA_LDHR                 = 0x00000000225f0200
        COMA_BASE0                = 0x00000000225f0000
        COMA_BASE1                = 0x00000000225f0000
        COMA_BASE2                = 0x00000000225f004b
        COMA_CNFG0                = 0x00000000225f0067
        COMA_CNFG1                = 0x00000000225f0000
        COMA_CNFG2                = 0xffffffff801a081d

PCI bridge (21071-DA) state:
        EPIC Diag. control/status = 0xffffffff82211000
        EPIC_PEAR                 = 0x0000000000520800
        EPIC_SEAR                 = 0x0000000000a2d000
        EPIC_TBR1                 = 0x0000000000000000
        EPIC_TBR2                 = 0x00000000008c0000
        EPIC_PBR1                 = 0x0000000040080000
        EPIC_PBR2                 = 0x0000000000700000
        EPIC_PMR1                 = 0x000000003ff00000
        EPIC_PMR2                 = 0xffffffff80000000
        EPIC_HARX1                = 0x0000000000000000
        EPIC_HARX2                = 0x00000000000000ff
        EPIC_PMLT                 = 0x0000000000814000
        EPIC_TAG0                 = 0x0000000000816000
        EPIC_TAG1                 = 0x0000000000814000
        EPIC_TAG2                 = 0x0000000000816000
        EPIC_TAG3                 = 0x000000000081e000
        EPIC_TAG4                 = 0x0000000000820000
        EPIC_TAG5                 = 0x0000000000812000
        EPIC_TAG6                 = 0x0000000000818000
        EPIC_TAG7                 = 0x0000000000000b94
        EPIC_DATA0                = 0x0000000000000b96
        EPIC_DATA1                = 0x0000000000000b94
        EPIC_DATA2                = 0x0000000000000b96
        EPIC_DATA3                = 0x0000000000002aac
        EPIC_DATA4                = 0x0000000000002baa
        EPIC_DATA5                = 0x0000000000000b92
        EPIC_DATA6                = 0x0000000000000b98
        EPIC_DATA7                = 0x0000000000000000


PCI bridge fault

unexpected machine check:

    mces    = 0x1
    vector  = 0x660
    param   = 0xfffffc0000006000
    pc      = 0xfffffc00006c00b8
    ra      = 0xfffffc0000387098
    code    = 0x100000205
    curproc = 0xfffffc00009229e0
        pid = 0, comm = swapper

panic: machine check
Stopped in pid 0 (swapper) at   cpu_Debugger+0x4:       ret     zero,(ra)
db> t
cpu_Debugger() at cpu_Debugger+0x4
panic() at panic+0x168
machine_check() at machine_check+0x254
dec_2100_a50_mcheck() at dec_2100_a50_mcheck+0xe68
dec_2100_a50_mcheck_handler() at dec_2100_a50_mcheck_handler+0x54
interrupt() at interrupt+0x1ac
XentInt() at XentInt+0x1c
--- interrupt (from ipl 3) ---
apecs_mem_read_1() at apecs_mem_read_1+0x18
fxp_intr() at fxp_intr+0x78
alpha_shared_intr_dispatch() at alpha_shared_intr_dispatch+0x6c
sio_iointr() at sio_iointr+0x68
interrupt() at interrupt+0x27c
XentInt() at XentInt+0x1c
--- interrupt (from ipl 0) ---
spl0() at spl0+0x40
cpu_configure() at cpu_configure+0x78
configure() at configure+0x40
main() at main+0x520
locorestart() at locorestart+0x64
--- root of call graph ---