Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Content-Type: text/plain;
        charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\))
Subject: Re: KCSAN + KVM = host reset
From:   Qian Cai <cai@lca.pw>
In-Reply-To: <fb39d3d2-063e-b828-af1c-01f91d9be31c@redhat.com>
Date:   Wed, 8 Apr 2020 17:29:18 -0400
Cc:     Elver Marco <elver@google.com>,
        "paul E. McKenney" <paulmck@kernel.org>,
        kasan-dev <kasan-dev@googlegroups.com>,
        LKML <linux-kernel@vger.kernel.org>, kvm@vger.kernel.org
Content-Transfer-Encoding: quoted-printable
Message-Id: <017E692B-4791-46AD-B9ED-25B887ECB56B@lca.pw>
References: <E180B225-BF1E-4153-B399-1DBF8C577A82@lca.pw>
 <fb39d3d2-063e-b828-af1c-01f91d9be31c@redhat.com>
To:     Paolo Bonzini <pbonzini@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


> On Apr 8, 2020, at 5:25 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>=20
> On 08/04/20 22:59, Qian Cai wrote:
>> Running a simple thing on this AMD host would trigger a reset right =
away.
>> Unselect KCSAN kconfig makes everything work fine (the host would =
also
>> reset If only "echo off > /sys/kernel/debug/kcsan=E2=80=9D before =
running qemu-kvm).
>=20
> Is this a regression or something you've just started to play with?  =
(If
> anything, the assembly language conversion of the AMD world switch =
that
> is in linux-next could have reduced the likelihood of such a failure,
> not increased it).

I don=E2=80=99t remember I had tried this combination before, so don=E2=80=
=99t know if it is a
regression or not.=