linux-kernel - Re: kvm: GPF in kvm_lapic_latched

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Message-ID: <CACT4Y+aWrRDZkeq=HWY9HA4n2Ac_sZ2vS4sDdGDZJtwvpBdaTA@mail.gmail.com>
Date:	Wed, 1 Jun 2016 09:59:47 +0200
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Gleb Natapov <gleb@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>, KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: kvm: GPF in kvm_lapic_latched_init

On Tue, May 31, 2016 at 12:35 PM, Paolo Bonzini <pbonzini@...hat.com> wrote:
>
>
> On 08/01/2016 19:42, Dmitry Vyukov wrote:
>> Hello,
>>
>> The following program triggers GPF in kvm_lapic_latched_init if run in
>> a parallel loop:
>> https://gist.githubusercontent.com/dvyukov/524b398f379440b21115/raw/9627095f57a72501fb51bf7565471d31732beeee/gistfile1.txt
>
> I've noticed that the program here tends to segfault a lot, even before
> reaching the kernel.  Is this intended?

Yes.