Re: [syzbot] WARNING in ex_handler_fprestore

From: Andy Lutomirski
Date: Tue May 25 2021 - 20:33:32 EST

On 5/24/21 1:51 AM, syzbot wrote:
> Hello,
> syzbot found the following issue on:
> HEAD commit: 45af60e7 Merge tag 'for-5.13-rc2-tag' of git://git.kernel...
> git tree: upstream
> console output:
> kernel config:
> dashboard link:
> compiler: Debian clang version 11.0.1-2
> syz repro:

Hi syz people and x86 people-

I entirely believe that this bug is real and that syzbot bisected it
correctly, but I'm puzzled by the reproducer. It says:

ptrace$setregs(0xd, r0, 0x0, &(0x7f0000000080))

I would really, really expect this to result from PTRACE_SETREGSET or

Am I missing something really obvious here?