From: Sean Christopherson <seanjc@google.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Dmitry Vyukov <dvyukov@google.com>,
syzbot <syzbot+42a71c84ef04577f1aef@syzkaller.appspotmail.com>,
Dave Hansen <dave.hansen@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
KVM list <kvm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Lorenzo Stoakes <lstoakes@gmail.com>,
Ingo Molnar <mingo@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
Thomas Gleixner <tglx@linutronix.de>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
wanpengli@tencent.com, the arch/x86 maintainers <x86@kernel.org>
Subject: Re: general protection fault in vmx_vcpu_run (2)
Date: Wed, 24 Feb 2021 10:07:53 -0800 [thread overview]
Message-ID: <YDaV+ThL4c+vTo4e@google.com> (raw)
In-Reply-To: <20210224174936.GG20344@zn.tnic>
On Wed, Feb 24, 2021, Borislav Petkov wrote:
> Hi Dmitry,
>
> On Wed, Feb 24, 2021 at 06:12:57PM +0100, Dmitry Vyukov wrote:
> > Looking at the bisection log, the bisection was distracted by something else.
>
> Meaning the bisection result:
>
> 167dcfc08b0b ("x86/mm: Increase pgt_buf size for 5-level page tables")
>
> is bogus?
Ya, looks 100% bogus.
> > You can always find the original reported issue over the dashboard link:
> > https://syzkaller.appspot.com/bug?extid=42a71c84ef04577f1aef
> > or on lore:
> > https://lore.kernel.org/lkml/0000000000007ff56205ba985b60@google.com/
>
> Ok, so this looks like this is trying to run kvm ioctls *in* a guest,
> i.e., nested. Right?
Yep. I tried to run the reproducer yesterday, but the kernel config wouldn't
boot my VM. I haven't had time to dig in. Anyways, I think you can safely
assume this is a KVM issue unless more data comes along that says otherwise.
next prev parent reply other threads:[~2021-02-24 18:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-05 15:20 general protection fault in vmx_vcpu_run (2) syzbot
2021-02-23 8:56 ` syzbot
2021-02-23 23:17 ` syzbot
2021-02-24 12:27 ` Borislav Petkov
2021-02-24 17:12 ` Dmitry Vyukov
2021-02-24 17:49 ` Borislav Petkov
2021-02-24 18:07 ` Sean Christopherson [this message]
2021-02-25 14:16 ` Dmitry Vyukov
2021-02-25 20:25 ` Sean Christopherson
2021-02-25 14:14 ` Dmitry Vyukov
2023-07-10 22:30 ` Sean Christopherson
2023-07-10 22:50 ` [syzbot] [kvm?] " syzbot
2023-07-10 23:39 ` Sean Christopherson
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