Re: "APIC error on CPUx" - what does this mean?

From: Steven Walter (
Date: Mon Jan 07 2002 - 12:32:27 EST

On Mon, Jan 07, 2002 at 02:16:28PM +0100, Petr Vandrovec wrote:
> Nope. Probably when CPU is in local APIC mode, it acknowledges interrupts
> to chipset with different timming, and from time to time CPU still
> sees IRQ pending, so it asks for vector, but as chipset has no
> interrupt pending, it answers with IRQ7. I did no analysis to find
> whether IRQ7 happens directly when we send confirmation to 8259,
> or whether it happens due to some noise on IRQ line.
> AFAIK it happens only on VIA based boards, and only if (AMD) CPU is using

My system is based on AMD's own 750 Irongate chipset, and it produces
both the initial spurious IRQ7 message and plentiful "ERR" interrupts:

srwalter@hapablap:~$ uptime
 11:31am up 42 days, 18:19, 1 user, load average: 1.04, 1.02, 1.00
srwalter@hapablap:~$ cat /proc/interrupts | grep ERR
ERR: 67169

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