linux-kernel - Re: [syzbot] WARNING: can't access registers at entry_SYSCALL_64_after

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Message-ID: <CACT4Y+Yq1knodAhoBnUe-Tf6QLrQCrGV5gyWC7An8poQDcfv6g@mail.gmail.com>
Date:   Thu, 16 Feb 2023 16:14:25 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+dac365e3ce07c3d0e496@...kaller.appspotmail.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING: can't access registers at entry_SYSCALL_64_after_hwframe

On Thu, 16 Feb 2023 at 15:13, syzbot
<syzbot+dac365e3ce07c3d0e496@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    9d9019bcea1a Add linux-next specific files for 20230215
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=144edcc8c80000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a64cbb8ad0da425e
> dashboard link: https://syzkaller.appspot.com/bug?extid=dac365e3ce07c3d0e496
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/70f0c6bb5351/disk-9d9019bc.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/7eed8686df34/vmlinux-9d9019bc.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/84bb6da6b00e/bzImage-9d9019bc.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+dac365e3ce07c3d0e496@...kaller.appspotmail.com
>
> WARNING: can't access registers at entry_SYSCALL_64_after_hwframe+0x63/0xcd


This is another splat of reports we started getting recently. Looks
like this may be ORC unwinder related as well.