linux-kernel - 2.6.22.1: Enabling IO-APIC = APIC error on CPU0: 40(40)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <Pine.LNX.4.64.0707140758110.22713@p34.internal.lan>
Date:	Sat, 14 Jul 2007 08:09:18 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	linux-kernel@...r.kernel.org
cc:	apiszcz@...arrain.com
Subject: 2.6.22.1: Enabling IO-APIC = APIC error on CPU0: 40(40)

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.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/