CPU0: local APIC error 0x40 CPU1: local APIC error 0x40

[Jeremy Chadwick]

On Tue, Mar 01, 2011 at 09:32:58PM -0500, Mike Tancsa wrote:
> On 3/1/2011 9:04 PM, Jeremy Chadwick wrote:
> > On Tue, Mar 01, 2011 at 08:50:17PM -0500, Mike Tancsa wrote:
> >> I had a machine deadlock just now and the only thing on the serial
> >> console was
> >>
> >> CPU0: local APIC error 0x40
> >> CPU1: local APIC error 0x40
> > 
> > The error in question I'm not familiar with, but the code in
> > src/sys/x86/x86/local_apic.c indicates that 0x40 is the contents of the
> > LAPIC ESR (error status register).
> > 
> > Please provide full output from a verbose boot.
> 
> Attached as a .txt file

Thanks -- this will probably be helpful to other folks, not so much me.
:-)  I lack familiarity with I/O and local APIC configuration.

The error strings in question aren't shown in the attached text file,
strangely enough.  Maybe only visible on VGA console?

Based on what I can find in Intel specifications, bit 6 (0x40) of the
ESR is defined as:

Bit 6: Receive Illegal Vector
Set when the local APIC detects an illegal vector (one in the range 0 to
15) in an interrupt message it receives or in an interrupt generated
locally from the local vector table or via a self IPI. Such interrupts
are not be delivered to the processor; the local APIC will never set an
IRR bit in the range 0 to 15.

I got this from Section 10.5.3 of Intel's IA-32 Intel Architecture
Software Developer's Manual, Volume 3A:

http://developer.intel.com/design/processor/manuals/253668.pdf

The motherboard looks like a Supermicro X7SBA or something along those
lines (I can tell from the ACPI string).  A workaround might be to
disable multiprocessor support in the BIOS (specifically Advanced ->
Advanced Processor Options -> Core-Multi-Processing = Disabled).  If
this does work, note that I agree it's not an acceptable permanent
solution.

CC'ing John who might have some ideas about the LAPIC stuff.

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.               PGP 4BD6C0CB |