linux-kernel - Re: KCSAN + KVM = host reset

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Message-Id: <017E692B-4791-46AD-B9ED-25B887ECB56B@lca.pw>
Date:   Wed, 8 Apr 2020 17:29:18 -0400
From:   Qian Cai <cai@....pw>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Elver Marco <elver@...gle.com>,
        "paul E. McKenney" <paulmck@...nel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org
Subject: Re: KCSAN + KVM = host reset



> On Apr 8, 2020, at 5:25 PM, Paolo Bonzini <pbonzini@...hat.com> wrote:
> 
> 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” before running qemu-kvm).
> 
> 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’t remember I had tried this combination before, so don’t know if it is a
regression or not.