linux-kernel - Re: WARNING in free_loaded

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Date:   Mon, 1 Apr 2019 12:16:50 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     syzbot <syzbot+01bc9e7a8a3f138b71cf@...kaller.appspotmail.com>
Cc:     dvyukov@...gle.com, hpa@...or.com, jmattson@...gle.com,
        karahmed@...zon.de, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        pbonzini@...hat.com, rkrcmar@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: Re: WARNING in free_loaded_vmcs (2)

On Sat, Mar 30, 2019 at 09:53:01PM -0700, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 8fcc4b5923af5de58b80b53a069453b135693304
> Author: Jim Mattson <jmattson@...gle.com>
> Date:   Tue Jul 10 09:27:20 2018 +0000
> 
>     kvm: nVMX: Introduce KVM_CAP_NESTED_STATE
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17fba63f200000
> start commit:   60c1f892 Merge tag 'dma-mapping-4.19-2' of git://git.infra..
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=1407a63f200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1007a63f200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4c7e83258d6e0156
> dashboard link: https://syzkaller.appspot.com/bug?extid=01bc9e7a8a3f138b71cf
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12a6513e400000
> 
> Reported-by: syzbot+01bc9e7a8a3f138b71cf@...kaller.appspotmail.com
> Fixes: 8fcc4b5923af ("kvm: nVMX: Introduce KVM_CAP_NESTED_STATE")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Blech, this is horribly stale.  Fixed by commit 5bea5123cbf0 ("KVM: VMX:
check nested state and CR4.VMXE against SMM").

#syz fix: KVM: VMX: check nested state and CR4.VMXE against SMM