linux-kernel - Re: kvm: GPF in kvm_lapic_latched

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Message-ID: <f2586939-506c-3579-34a9-b664afd5d372@redhat.com>
Date:	Tue, 31 May 2016 12:35:59 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Dmitry Vyukov <dvyukov@...gle.com>, 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@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Cc:	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 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?

Thanks,

Paolo