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

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Date:	Fri, 12 Aug 2016 13:50:29 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Huaitong Han <huaitong.han@...el.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/x2apic: fix x2apic_cluster_probe null pointer

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

Regards,
Wanpeng Li