APIC error on SMP machine

From: Chris Rankin (rankincj_at_yahoo.com)
Date: 09/30/03

  • Next message: Ulrich Drepper: "Re: 2.6.0-test6 oops futex"" 
    Date:	Tue, 30 Sep 2003 22:42:19 +0100
To: linux-kernel <linux-kernel@vger.kernel.org>

    Linux-2.4.22-SMP, 1 GB RAM, devfs, gcc-3.2.3.

    Hi,

    Today, my dual PIII (Coppermine) refused to boot, and wrote a large number of
    these messages to the serial console instead:

    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)
    APIC error on CPU1: 04(04)

    Can anyone tell me what these might mean, please? The kernel source implies that
    it's a "Send accept error", but this doesn't help me in an "Ah, I can fix that!"
    sense.

    Does this APIC error just mean that the CPU is unhappy in this slot, and is
    refusing to listen to the motherboard? Or is the motherboard refusing to listen
    to the CPU?

    Background:
    This machine has been misbehaving for a while. I thought I had worked around the
    problem by underclocking the FSB from 133 MHz to 100 MHz, but that now looks
    like it was just a "reprieve". I have tried running "nosmp", "pci=noacpi" and
    "noapic pci=noacpi" without success, and have resorted to yanking the CPU out of
    this slot entirely. (I suspect that the CPU is fine, however.) I have also
    restored the FSB to 133 MHz, so I am currently running the SMP kernel on a
    single 933 MHz PIII.

    Cheers,
    Chris

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