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To:     syzbot <syzbot+bc9dbf05dcc151e9b972@syzkaller.appspotmail.com>,
        alexandre.chartre@oracle.com, bp@alien8.de, hpa@zytor.com,
        linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com,
        peterz@infradead.org, syzkaller-bugs@googlegroups.com,
        x86@kernel.org, Josh Poimboeuf <jpoimboe@redhat.com>
Subject: Re: WARNING: can't access registers at asm_sysvec_call_function_single
In-Reply-To: <0000000000002b02cf05aed302f3@google.com>
References: <0000000000002b02cf05aed302f3@google.com>
Date:   Sun, 13 Sep 2020 23:05:21 +0200
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On Tue, Sep 08 2020 at 13:16, syzbot wrote:

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    f4d51dff Linux 5.9-rc4
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1455d4f9900000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a9075b36a6ae26c9
> dashboard link: https://syzkaller.appspot.com/bug?extid=bc9dbf05dcc151e9b972
> compiler:       gcc (GCC) 10.1.0-syz 20200507
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+bc9dbf05dcc151e9b972@syzkaller.appspotmail.com
>
> WARNING: can't access registers at asm_sysvec_call_function_single+0x12/0x20 arch/x86/include/asm/idtentry.h:589

That's the ORC unwinder complaining, but I have no idea why...