Re: KASAN: use-after-free Read in psi_task_change

syzbot has bisected this bug to:

commit e9db4ef6bf4ca9894bb324c76e01b8f1a16b2650
Author: John Fastabend [off-list ref]
Date:   Sat Jun 30 13:17:47 2018 +0000

     bpf: sockhash fix omitted bucket lock in sock_close

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10f4840c600000
start commit:   bed38c3e Merge tag 'powerpc-5.3-2' of git://git.kernel.org..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=12f4840c600000
console output: https://syzkaller.appspot.com/x/log.txt?x=14f4840c600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9aec8cb13b5f7389
dashboard link: https://syzkaller.appspot.com/bug?extid=f17ba6f9b8d9cc0498d0
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10dc7b34600000

Reported-by: syzbot+f17ba6f9b8d9cc0498d0@syzkaller.appspotmail.com
Fixes: e9db4ef6bf4c ("bpf: sockhash fix omitted bucket lock in sock_close")

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