Re: BAD APICID ?

Dave Jones
2011-11-07T18:55:58Z

On Mon, Nov 07, 2011 at 06:54:02PM +0100, Borislav Petkov wrote:
> On Mon, Nov 07, 2011 at 12:39:48PM -0500, Dave Jones wrote:
> > We got a report from a Fedora user hitting a WARN_ON in the apic setup code.
> >
> > Here..
> >
> > 1230 #ifdef CONFIG_X86_32
> > 1231 /*
> > 1232 * APIC LDR is initialized. If logical_apicid mapping was
> > 1233 * initialized during get_smp_config(), make sure it matches the
> > 1234 * actual value.
> > 1235 */
> > 1236 i = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
> > 1237 WARN_ON(i != BAD_APICID && i != logical_smp_processor_id());
> > 1238 /* always use the value from LDR */
> > 1239 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
> > 1240 logical_smp_processor_id();
> >
> > The full report is at https://bugzilla.redhat.com/show_bug.cgi?id=743930
> >
> > Report is against our 3.0 builds, but that code look unchanged in 3.1 too,
> > and even in current Linus head.
> >
> > Any thoughts on what could cause this ?
>
> Already fixed upstream: 838312be46f3abfbdc175f81c3e54a857994476d
>
> Here's the whole thread: http://lkml.org/lkml/2011/10/14/231
>
> HTH.

ah, excellent, thanks.
That seems to have not hit stable, even though it was cc'd. Greg ?

Dave