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

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Message-ID: <fb39d3d2-063e-b828-af1c-01f91d9be31c@redhat.com>
Date:   Wed, 8 Apr 2020 23:25:45 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Qian Cai <cai@....pw>, Elver Marco <elver@...gle.com>
Cc:     "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 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).

Paolo