linux-kernel - Re: kvm: WARNING in kvm_arch_vcpu_ioctl

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Message-ID: <8a829321-d79e-95fb-9df6-db032fb78305@redhat.com>
Date:   Mon, 14 Nov 2016 15:45:22 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>, KVM list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Steve Rutherford <srutherford@...gle.com>
Subject: Re: kvm: WARNING in kvm_arch_vcpu_ioctl_run



On 14/11/2016 15:09, Dmitry Vyukov wrote:
> 
> I made dump_vmcs() no-op locally. You should see the warning
> regardless, but probably it is difficult to notice. Or maybe tons of
> output affect timings so that the warning does not happen.

I let it run for several minutes, and only got 50 splats out of several
thousand iterations.  Reproducing is not going to help much anyway---if
we can get to the root cause, writing a reliable reproducer would be
easier anyway.

Paolo