Re: WARNING in arch_install_hw_breakpoint

[syzbot]

syzbot suspects this bug was fixed by commit:

commit b3e5838252665ee4cfa76b82bdf1198dca81e5be
Author: Christian Brauner <christian@xxxxxxxxxx>
Date:   Wed Mar 27 12:04:15 2019 +0000

    clone: add CLONE_PIDFD

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1268377ae00000
start commit:   fd1f297b Merge tag 'drm-fixes-2019-03-22' of git://anongit..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=9a31fb246de2a622
dashboard link: https://syzkaller.appspot.com/bug?extid=370a6b0f11867bf13515
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15d8bd93200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15439f27200000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: clone: add CLONE_PIDFD

For information about bisection process see: https://goo.gl/tpsmEJ#bisection