linux-kernel - Re: WARNING in do_syscall

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Message-ID: <CALCETrXreVrWEsBBYX8KS=-DFW=5RB7SAKcgcdPtzJtML6n7UQ@mail.gmail.com>
Date:   Sun, 19 Jul 2020 08:12:45 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     syzbot <syzbot+29454675f5fe94137999@...kaller.appspotmail.com>
Cc:     Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        syzkaller-bugs@...glegroups.com,
        Thomas Gleixner <tglx@...utronix.de>, X86 ML <x86@...nel.org>
Subject: Re: WARNING in do_syscall_64

On Sun, Jul 19, 2020 at 12:42 AM syzbot
<syzbot+29454675f5fe94137999@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    e9919e11 Merge branch 'for-linus' of git://git.kernel.org/..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11dca4cf100000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e944500a36bc4d55
> dashboard link: https://syzkaller.appspot.com/bug?extid=29454675f5fe94137999
> compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
>
> Unfortunately, I don't have any reproducer for this issue yet.

On a brief inspection, the only way I can see this happening is if the
syscall flags msr got corrupted.  There's not much code between the
actual hardware entry and this warning.

--Andy