linux-kernel - Re: general protection fault in vmx_vcpu

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Date:   Tue, 23 Feb 2021 15:17:07 -0800
From:   syzbot <syzbot+42a71c84ef04577f1aef@...kaller.appspotmail.com>
To:     bp@...en8.de, bp@...e.de, dave.hansen@...el.com, hpa@...or.com,
        jmattson@...gle.com, joro@...tes.org,
        kirill.shutemov@...ux.intel.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, lstoakes@...il.com, mingo@...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: general protection fault in vmx_vcpu_run (2)

syzbot has bisected this issue to:

commit 167dcfc08b0b1f964ea95d410aa496fd78adf475
Author: Lorenzo Stoakes <lstoakes@...il.com>
Date:   Tue Dec 15 20:56:41 2020 +0000

    x86/mm: Increase pgt_buf size for 5-level page tables

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13fe3ea8d00000
start commit:   a99163e9 Merge tag 'devicetree-for-5.12' of git://git.kern..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10013ea8d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17fe3ea8d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=49116074dd53b631
dashboard link: https://syzkaller.appspot.com/bug?extid=42a71c84ef04577f1aef
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=141f3f04d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17de4f12d00000

Reported-by: syzbot+42a71c84ef04577f1aef@...kaller.appspotmail.com
Fixes: 167dcfc08b0b ("x86/mm: Increase pgt_buf size for 5-level page tables")

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