APIC error on CPU0 (UP APIC kernel)

[Chaskiel M Grundman]

I have some single-processr Dell Poweredge 2450 servers that I'm trying
to move to 2.4. They have been running 2.2 SMP kernels for a while with
no problem (to take advantage of the supposed benefit of using the
ioapic). 

2.4 SMP kernels seem to work fine, but using a 2.4.1 or 2.4.2 UP kernel
with CONFIG_X86_UP_IOAPIC does not. At some point before the real root
filesystem is mounted, the system begins spewing 

APIC error on CPU0: 08(08)

at a high rate and eventually either locks up, or is killed by the
watchdog nmi (at which point control-alt-delete _works_)

2450's use a serverworks chipset. I don't know what other information
might be useful... 

Here's an excerpt of the SMP 2.4.2 dmesg output, in case it's of any use:

ENABLING IO-APIC IRQs
...changing IO-APIC physical APIC ID to 1 ... ok.
...changing IO-APIC physical APIC ID to 2 ... ok.
Synchronizing Arb IDs.
init IO_APIC IRQs
 IO-APIC (apicid-pin) 1-0, 1-2, 1-3, 1-5, 1-10, 1-11, 1-13, 2-3, 2-8,
2-9, 2-10,
 2-11, 2-12, 2-13 not connected.
..TIMER: vector=49 pin1=-1 pin2=0
...trying to set up timer (IRQ0) through the 8259..... (found pin 0) ...works.
activating NMI Watchdog ... done.
number of MP IRQ sources: 27.
number of IO-APIC #1 registers: 16.
number of IO-APIC #2 registers: 16.
testing the IO APIC.......................

IO APIC #1......
.... register #00: 01000000
.......    : physical APIC id: 01
.... register #01: 000F0011
.......     : max redirection entries: 000F
.......     : IO APIC version: 0011
.... register #02: 00000000
.......     : arbitration: 00
.... IRQ redirection table:
 NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:   
 00 001 01  0    0    0   0   0    1    1    31
 01 001 01  0    0    0   0   0    1    1    39
 02 000 00  1    0    0   0   0    0    0    00
 03 000 00  1    0    0   0   0    0    0    00
 04 001 01  0    0    0   0   0    1    1    41
 05 000 00  1    0    0   0   0    0    0    00
 06 001 01  0    0    0   0   0    1    1    49
 07 001 01  0    0    0   0   0    1    1    51
 08 001 01  0    0    0   0   0    1    1    59
 09 001 01  0    0    0   0   0    1    1    61
 0a 000 00  1    0    0   0   0    0    0    00
 0b 000 00  1    0    0   0   0    0    0    00
 0c 001 01  0    0    0   0   0    1    1    69
 0d 000 00  1    0    0   0   0    0    0    00
 0e 001 01  0    0    0   0   0    1    1    71
 0f 001 01  0    0    0   0   0    1    1    79
IO APIC #2......
.... register #00: 02000000
.......    : physical APIC id: 02
.... register #01: 000F0011
.......     : max redirection entries: 000F
.......     : IO APIC version: 0011
.... register #02: 02000000
.......     : arbitration: 02
.... IRQ redirection table:
 NR Log Phy Mask Trig IRR Pol Stat Dest Deli Vect:   
 00 001 01  1    1    0   1   0    1    1    81
 01 001 01  1    1    0   1   0    1    1    89
 02 001 01  1    1    0   1   0    1    1    91
 03 000 00  1    0    0   0   0    0    0    00
 04 001 01  1    1    0   1   0    1    1    99
 05 001 01  1    1    0   1   0    1    1    A1
 06 001 01  1    1    0   1   0    1    1    A9
 07 001 01  1    1    0   1   0    1    1    B1
 08 000 00  1    0    0   0   0    0    0    00
 09 000 00  1    0    0   0   0    0    0    00
 0a 000 00  1    0    0   0   0    0    0    00
 0b 000 00  1    0    0   0   0    0    0    00
 0c 000 00  1    0    0   0   0    0    0    00
 0d 000 00  1    0    0   0   0    0    0    00
 0e 001 01  1    1    0   1   0    1    1    B9
 0f 001 01  1    1    0   1   0    1    1    C1
IRQ to pin mappings:
IRQ1 -> 1
IRQ4 -> 4
IRQ6 -> 6
IRQ7 -> 7
IRQ8 -> 8
IRQ9 -> 9
IRQ12 -> 12
IRQ14 -> 14
IRQ15 -> 15
IRQ16 -> 0
IRQ17 -> 1
IRQ18 -> 2
IRQ20 -> 4
IRQ21 -> 5
IRQ22 -> 6
IRQ23 -> 7
IRQ30 -> 14
IRQ31 -> 15
.................................... done.
calibrating APIC timer ...
..... CPU clock speed is 731.0440 MHz.
..... host bus clock speed is 132.9169 MHz.
cpu: 0, clocks: 1329169, slice: 664584
CPU0<T0:1329168,T1:664576,D:8,S:664584,C:1329169>
Setting commenced=1, go go go
PCI: PCI BIOS revision 2.10 entry at 0xfc79e, last bus=3
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: ServerWorks host bridge: last bus ff
Unknown bridge resource 0: assuming transparent
Unknown bridge resource 1: assuming transparent
Unknown bridge resource 2: assuming transparent
Unknown bridge resource 0: assuming transparent
Unknown bridge resource 1: assuming transparent
Unknown bridge resource 2: assuming transparent
PCI: Discovered primary peer bus 02 [IRQ]
PCI: Using IRQ router ServerWorks [1166/0200] at 00:0f.0
PCI->APIC IRQ transform: (B0,I2,P0) -> 20
PCI->APIC IRQ transform: (B0,I8,P0) -> 22
PCI->APIC IRQ transform: (B2,I8,P0) -> 16
[...]
ServerWorks OSB4: IDE controller on PCI bus 00 dev 79
ServerWorks OSB4: chipset revision 0
ServerWorks OSB4: not 100% native mode: will probe irqs later
    ide0: BM-DMA at 0x08b0-0x08b7, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0x08b8-0x08bf, BIOS settings: hdc:pio, hdd:pio
hda: TOSHIBA CD-ROM XM-7002B, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
[...]
VFS: Mounted root (ext2 filesystem).
SCSI subsystem driver Revision: 1.00
kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2
megaraid: v107 (December 22, 1999)
megaraid: found 0x8086:0x1960: in 00:02.1
scsi0 : Found a MegaRAID controller at 0xf8820000, IRQ: 20
megaraid: [1.01:1p00] detected 1 logical drives
[..]