linux-kernel - Re: [syzbot] WARNING in free_loaded

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Date:   Tue, 25 Jan 2022 20:21:57 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     syzbot <syzbot+8112db3ab20e70d50c31@...kaller.appspotmail.com>
Cc:     bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        jmattson@...gle.com, joro@...tes.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        pbonzini@...hat.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, vkuznets@...hat.com, wanpengli@...cent.com,
        x86@...nel.org
Subject: Re: [syzbot] WARNING in free_loaded_vmcs (3)

On Mon, Jan 24, 2022, syzbot wrote:
> WARNING: CPU: 0 PID: 3606 at arch/x86/kvm/vmx/vmx.c:2665 free_loaded_vmcs arch/x86/kvm/vmx/vmx.c:2665 [inline]
> WARNING: CPU: 0 PID: 3606 at arch/x86/kvm/vmx/vmx.c:2665 free_loaded_vmcs+0x158/0x1a0 arch/x86/kvm/vmx/vmx.c:2656

KVM gets confused if userspace abuses KVM_SET_VCPU_EVENTS to toggle SMM on/off
while the vCPU is post-VMXON, I'll send a patch.