syzbot has bisected this issue to:
commit 8b401f9ed2441ad9e219953927a842d24ed051fc
Author: Yonghong Song <yhs@xxxxxx>
Date: Thu May 23 21:47:45 2019 +0000
bpf: implement bpf_send_signal() helper
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=123408e7500000
start commit: 7d68e382 bpf: Permit size-0 datasec
git tree: bpf-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=113408e7500000
console output: https://syzkaller.appspot.com/x/log.txt?x=163408e7500000
kernel config: https://syzkaller.appspot.com/x/.config?x=e0c7843b8af99dff
dashboard link: https://syzkaller.appspot.com/bug?extid=fad5d91c7158ce568634
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1224daa4d00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13dfabd0d00000
Reported-by: syzbot+fad5d91c7158ce568634@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 8b401f9ed244 ("bpf: implement bpf_send_signal() helper")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
