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SubjectRe: APIC error on 32-bit kernel
Date
> > We're trying to track down the source of a problem that occurs
> > whenever the atl1 network driver is activated on a 32-bit 2.6.21-rc4
>
> and -rc5, -rc6, 2.6.20.x, 2.6.19.3, and probably others.
>
> > We can load the driver just fine, but whenever we activate the
> > network, we see APIC errors (a sample of them are shown here,
> > captured from a serial console):
> >
> > [root@hawk ~]# echo 8 > /proc/sys/kernel/printk
> > [root@hawk ~]# [ 93.942012] process `sysctl' is using deprecated
> > sysctl (sysc.
> > [ 94.396609] atl1: eth0 link is up 1000 Mbps full duplex
> > [ 94.498887] APIC error on CPU0: 00(08)
> > [ 94.498534] APIC error on CPU1: 00(08)
> > [ 94.550079] APIC error on CPU0: 08(08)
> > [ 94.549725] APIC error on CPU1: 08(08)
> > [ 94.600915] APIC error on CPU1: 08(08)
> > [ 94.601276] APIC error on CPU0: 08(08)
> > [ 94.652108] APIC error on CPU1: 08(08)
> > [ 94.652470] APIC error on CPU0: 08(08)
> > [ 94.703659] APIC error on CPU0: 08(08)
> > [ 94.703305] APIC error on CPU1: 08(08)
> > [ 94.754852] APIC error on CPU0: 08(40)
> > [ 94.806045] APIC error on CPU0: 40(08)

/* Here is what the APIC error bits mean:
0: Send CS error
1: Receive CS error
2: Send accept error
3: Receive accept error
4: Reserved
5: Send illegal vector
6: Received illegal vector
7: Illegal register address
*/

So the 40 means the APIC got an illegal vector.
Certainly this is consistent with the fact that
the errors start when a specific device is being
used. I assume that device is using MSI?
Curious that it is different in 32-bit and 64-bit mode.



> > [ 94.805692] APIC error on CPU1: 08(08)
> > [ 94.857238] APIC error on CPU0: 08(08)
> > [ 94.856884] APIC error on CPU1: 08(08)
> > [ 94.908432] APIC error on CPU0: 08(08)
> > [ 94.908078] APIC error on CPU1: 08(08)
> > [snip, more of the same]
> > [ 98.901156] APIC error on CPU1: 08(08)
> > [ 98.952702] APIC error on CPU0: 08(08)
> > [ 98.952349] APIC error on CPU1: 08(08)
> > [ 99.003895] APIC error on CPU0: 08(08)
> > [ 99.003542] APIC error on CPU1: 08(08)
> >
> > The machine hangs for about 5-10 seconds, then spontaneously reboots
> > without further console output.
>
> I can prompt an oops by pinging my router while the apic errors are
> scrolling by.
>
> >
> > This is an Asus M2V (Via K8T890) motherboard.
> >
> > The problem does not occur on a 32-bit kernel if we boot with
> > pci=nomsi, and it doesn't occur at all on a 64-bit kernel on the same
> > motherboard.

pci=nomsi, works, okay...


> > We also do not see this problem on Intel-based motherboards, with
> > either 32- or 64-bit kernels.
>
> A full raft of documentation -- including acpidump and
> linux-firmware-kit output, console capture, kernel config, lspci -vvxxx
> (with apic=debug boot option), dmesg, and /proc/interrupts -- is
> available at http://www.hogchain.net/m2v/apic-problem/


[06Dh 109 2] Boot Architecture Flags : 0003

for what it is worth, the bit in ACPI that is used to
disable MSI support is not set -- so as far as the BIOS
is concerned, this system should support MSI.

Is it an add-in card, or lan-on-motherboard?

-Len
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