syzbot has bisected this issue to:
commit 449325b52b7a6208f65ed67d3484fd7b7184477b
Author: Alexei Starovoitov <ast@xxxxxxxxxx>
Date: Tue May 22 02:22:29 2018 +0000
umh: introduce fork_usermode_blob() helper
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10fc4b00900000
start commit: 9e50b94b Add linux-next specific files for 20200703
git tree: linux-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=12fc4b00900000
console output: https://syzkaller.appspot.com/x/log.txt?x=14fc4b00900000
kernel config: https://syzkaller.appspot.com/x/.config?x=f99cc0faa1476ed6
dashboard link: https://syzkaller.appspot.com/bug?extid=4c50ac32e5b10e4133e1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1111fb6d100000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1218fa1f100000
Reported-by: syzbot+4c50ac32e5b10e4133e1@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 449325b52b7a ("umh: introduce fork_usermode_blob() helper")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
