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

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Date:   Tue, 07 Dec 2021 11:19:14 -0800
From:   syzbot <syzbot+f1d2136db9c80d4733e8@...kaller.appspotmail.com>
To:     bp@...en8.de, dave.hansen@...ux.intel.com, fgheet255t@...il.com,
        hpa@...or.com, jmattson@...gle.com, joro@...tes.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, mlevitsk@...hat.com, pbonzini@...hat.com,
        seanjc@...gle.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, vkuznets@...hat.com, wanpengli@...cent.com,
        x86@...nel.org
Subject: Re: [syzbot] WARNING in nested_vmx_vmexit

syzbot has bisected this issue to:

commit c8607e4a086fae05efe5bffb47c5199c65e7216e
Author: Maxim Levitsky <mlevitsk@...hat.com>
Date:   Mon Sep 13 14:09:53 2021 +0000

    KVM: x86: nVMX: don't fail nested VM entry on invalid guest state if !from_vmentry

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10f21e3ab00000
start commit:   f80ef9e49fdf Merge tag 'docs-5.16-3' of git://git.lwn.net/..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=12f21e3ab00000
console output: https://syzkaller.appspot.com/x/log.txt?x=14f21e3ab00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7d5e878e3399b6cc
dashboard link: https://syzkaller.appspot.com/bug?extid=f1d2136db9c80d4733e8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1603533ab00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=175b5f3db00000

Reported-by: syzbot+f1d2136db9c80d4733e8@...kaller.appspotmail.com
Fixes: c8607e4a086f ("KVM: x86: nVMX: don't fail nested VM entry on invalid guest state if !from_vmentry")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection