linux-kernel - Re: [PATCH] x86/x2apic: fix x2apic_cluster

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Date:	Fri, 12 Aug 2016 05:59:25 +0000
From:	"Han, Huaitong" <huaitong.han@...el.com>
To:	"kernellwp@...il.com" <kernellwp@...il.com>
CC:	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH] x86/x2apic: fix x2apic_cluster_probe null pointer

On Fri, 2016-08-12 at 13:50 +0800, Wanpeng Li wrote:
> 2016-08-12 13:30 GMT+08:00 Huaitong Han <huaitong.han@...el.com>:
> > percpu cpus_in_cluster is a pointer with CONFIG_CPUMASK_OFFSTACK, cpu_in_cluster
> > is not alloced memory before x2apic_prepare_cpu is invoked, so cpumask_set_cpu
> > would get a NULL pointer bug:
> >  BUG: unable to handle kernel NULL pointer dereference at (null)
> >  IP: [<ffffffff8105ac25>] x2apic_cluster_probe+0x35/0x70
> 
> Could you try this? https://lkml.org/lkml/2016/8/4/345
Get, it has been fixed,
http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=d52c0569bab4edc888832df44dc7ac28517134f6
> 
> Regards,
> Wanpeng Li