linux-kernel - Re: [syzbot] WARNING in x86_emulate

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Message-ID: <CACT4Y+YDtBf1GebeAA=twsfuv9e0HN+w7Lt5ZqDJhMJ5-PWYXQ@mail.gmail.com>
Date:   Mon, 7 Jun 2021 12:34:30 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Wanpeng Li <kernellwp@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        syzkaller <syzkaller@...glegroups.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        syzbot <syzbot+71271244f206d17f6441@...kaller.appspotmail.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, jarkko@...nel.org,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kan.liang@...ux.intel.com,
        kvm <kvm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-sgx@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sean Christopherson <seanjc@...gle.com>, steve.wahl@....com,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [syzbot] WARNING in x86_emulate_instruction

On Fri, May 28, 2021 at 2:34 AM Wanpeng Li <kernellwp@...il.com> wrote:
>
> On Fri, 28 May 2021 at 08:31, Thomas Gleixner <tglx@...utronix.de> wrote:
> >
> > On Fri, May 28 2021 at 01:21, Paolo Bonzini wrote:
> > > On 28/05/21 00:52, Thomas Gleixner wrote:
> > >>
> > >> So this is stale for a week now. It's fully reproducible and nobody
> > >> can't be bothered to look at that?
> > >>
> > >> What's wrong with you people?
> > >
> > > Actually there's a patch on list ("KVM: X86: Fix warning caused by stale
> > > emulation context").  Take care.
> >
> > That's useful, but does not change the fact that nobody bothered to
> > reply to this report ...
>
> Will do it next time. Have a nice evening, guys!

There was an idea to do this automatically by syzbot:

dashboard/app: notify bug report about fix patches
https://github.com/google/syzkaller/issues/1574

Namely: if syzbot discovers a fix anywhere (by the hash), it could
send a notification email to the bug report email thread.
The downside is that the robot sends even more emails, so I am not
sure how it will be accepted. Any opinions?