linux-kernel - Re: BAD APICID ?

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Message-ID: <20111107180950.GA6411@redhat.com>
Date:	Mon, 7 Nov 2011 13:09:50 -0500
From:	Dave Jones <davej@...hat.com>
To:	Borislav Petkov <bp@...64.org>
Cc:	x86@...nel.org, Linux Kernel <linux-kernel@...r.kernel.org>,
	gregkh@...e.de
Subject: Re: BAD APICID ?

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

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