linux-kernel - Re: Boot failure on x86_64 (OOPS set_cpu_sibling

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Date:	Thu, 30 Jul 2009 15:56:23 +0200
From:	Borislav Petkov <borislav.petkov@....com>
To:	Sachin Sant <sachinp@...ibm.com>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: Boot failure on x86_64 (OOPS set_cpu_sibling_map() )

Hi,

On Thu, Jul 30, 2009 at 04:55:44PM +0530, Sachin Sant wrote:
> Today's Next failed to boot on a x86_64 box with following traces
> 
> ACPI: Core revision 20090625
> BUG: unable to handle kernel NULL pointer dereference at (null)
> IP: [<ffffffff81328c7b>] set_cpu_sibling_map+0x24f/0x353

I can't trigger it here, please send me your .config. In the meantime,
you could try the following:

--
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 3ede593..5fd57fe 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1070,6 +1070,7 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 	for_each_possible_cpu(i) {
 		zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
 		zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
+		zalloc_cpumask_var(&per_cpu(cpu_node_map, i), GFP_KERNEL);
 		zalloc_cpumask_var(&cpu_data(i).llc_shared_map, GFP_KERNEL);
 	}
 	set_cpu_sibling_map(0);
-- 
1.6.3.3


-- 
Regards/Gruss,
Boris.

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