linux-kernel - Re: [PATCH stable-4.19 1/2] KVM: nVMX: do not use dangling shadow VMCS after guest reset

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Message-ID: <471a1023-4f0a-5727-e7b2-48701f75188f@redhat.com>
Date:   Mon, 29 Jul 2019 11:30:19 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Jack Wang <jack.wang.usish@...il.com>,
        Sasha Levin <sashal@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>, stable@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH stable-4.19 1/2] KVM: nVMX: do not use dangling shadow
 VMCS after guest reset

On 29/07/19 11:29, Jack Wang wrote:
> Thanks Paolo for confirmation. I'm asking because we had one incident
> in our production with 4.14.129 kernel,
> System is Skylake Gold cpu, first kvm errors, host hung afterwards
> 
> kernel: [1186161.091160] kvm: vmptrld           (null)/6bfc00000000 failed
> kernel: [1186161.091537] kvm: vmclear fail:           (null)/6bfc00000000
> kernel: [1186186.490300] watchdog: BUG: soft lockup - CPU#54 stuck for
> 23s! [qemu:16639]
> 
> Hi Sasha, hi Greg,
> 
> Would be great if you can pick this patch also to 4.14 kernel.

Acked-by: Paolo Bonzini <pbonzini@...hat.com>