local APIC error 0x40

[Konstantin Belousov]

On Mon, Jul 23, 2012 at 03:49:37PM -0600, Dan Allen wrote:
> Running FreeBSD 8.3 -- and updating sources on a daily base and building everything -- I found a new APIC/ACPI problem introduced in the past week.
> 
> I have a Toshiba Satellite U205 with an Intel Core Duo (not a Core 2).  It used to work fine with both cores but then sometime in on the road to BSD 8.0 the machine began hanging.  So I added to /boot/loader.conf
> 
>   hint.apic.0.disabled="1"
> 
> and the machine only had one core but it went back to being reliable.
> 
> The laptop sits idle a lot, so I also have in /etc/rc.conf
> 
>   performance_cx_lowest="LOW"
> 
> and the fans stay off unless I am doing a build.  Everything was good.
> 
> I went away on a trip last week for five days, came home, did a csup to RELENG_8 and rebuilt the world, as usual, and now the fans are always running full!
> 
> If I comment out hint.apic.0.disabled="1" from /boot/loader.conf and reboot, the results are a mixed bag:
> 
> 1) I get my 2nd core back, and it no longer hangs! Hurray.
> 2) The fans go back to usually being off and silent.  Hurray!
> 3) I get zillions of error messages streaming saying:
> 
>   CPU0: local APIC error 0x40
>   CPU1: local APIC error 0x40
> 
> No good!
> 
> 
> I am sitting at a prompt, no X-Windows, no apps running (other than the usual demons), and every few seconds I get another pair of these error messages.
> 
> 4) The error appears benign other than flooding the console.  Everything works, nothing hangs, I can build the OS and everything appears fine.
> 
> So how do I get rid of these messages?  What does error 0x40 mean?

Does your system slows down with these messages ? 0x40 means that some
code tried to send IPI with interrupt number from the range of assigned
CPU faults. I believe that FreeBSD code never does that.

Is there a BIOS upgrade for your machine ?
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