I am experiencing the similar problem on my Acer Aspire 5000 laptop -
once in a while a bunch of "APIC error on CPU0: 40(40)" messages are
showing up in dmesg.
After few experiments and a lot of googling, I identified a cause - it
was my built-in wireless card! Disabling IO-APIC helped, besides a
single "Spurious 8259A interrupt: IRQ7" message while booting up there
was nothing unusual.
A did some further experiments on various hardware and from my
experience I can tell that "APIC error" messages are entirely hardware
related.
Regards,
Konstantin
On Sat, 2007-07-14 at 08:09 -0400, Justin Piszcz wrote:
> I have an older MSI motherboard and when I enable the following option:
>
> >From lshw:
> description: Motherboard
> product: MS-6730
>
> [*] IO-APIC support on uniprocessors
>
> I get the following errors in dmesg:
>
> [ 247.177372] APIC error on CPU0: 00(40)
> [ 247.556741] APIC error on CPU0: 40(40)
> [ 262.010412] APIC error on CPU0: 40(40)
> [ 262.765553] APIC error on CPU0: 40(40)
> [ 263.876481] APIC error on CPU0: 40(40)
> [ 264.191962] APIC error on CPU0: 40(40)
> [ 265.040566] APIC error on CPU0: 40(40)
> [ 267.959689] APIC error on CPU0: 40(40)
> [ 269.446029] APIC error on CPU0: 40(40)
> [ 269.853344] APIC error on CPU0: 40(40)
> [ 271.122825] APIC error on CPU0: 40(40)
> [ 271.287051] APIC error on CPU0: 40(40)
> [ 273.825237] APIC error on CPU0: 40(40)
> [ 274.373737] APIC error on CPU0: 40(40)
> [ 275.355775] APIC error on CPU0: 40(40)
> [ 275.982087] APIC error on CPU0: 40(40)
> [ 276.101181] APIC error on CPU0: 40(40)
> [ 276.173611] APIC error on CPU0: 40(40)
> [ 276.970970] APIC error on CPU0: 40(40)
> [ 277.561575] APIC error on CPU0: 40(40)
> [ 278.694486] APIC error on CPU0: 40(40)
> [ 279.353573] APIC error on CPU0: 40(40)
> [ 281.779398] APIC error on CPU0: 40(40)
> [ 283.625457] APIC error on CPU0: 40(40)
> [ 284.749322] APIC error on CPU0: 40(40)
> [ 284.983013] APIC error on CPU0: 40(40)
> [ 285.126394] APIC error on CPU0: 40(40)
>
> I normally do not use this option (which also gets rid of the errors*1),
> but I am curious, why do these errors occur? I remember them with the early
> 2.6.x series and they are still re-occurring in 2.6.22.1.
>
> The weird part-- is when IO-APIC is disabled, I see this on boot:
>
> IO-APIC DISABLED:
>
> [ 46.902712] XFS mounting filesystem md0
> [ 47.017322] spurious 8259A interrupt: IRQ7.
> [ 47.273009] Ending clean XFS mount for filesystem: md0
>
> IO-APIC ENABLED:
>
> [ 46.851012] XFS mounting filesystem md0
> [ 47.103066] Ending clean XFS mount for filesystem: md0
>
> * 1 Anytime I see a spurious interrupt on (usually older hardware)
> especially during file I/O this usually means corruption (from what I
> have seen) that is why I don't really want to trust anything on this host.
>
> Anyone have any idea what's going on here?
>
> Justin.
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