syzbot has bisected this bug to:
commit c22397888f1eed98cd59f0a88f2a5f6925f80e15
Author: Chanho Min <chanho.min@xxxxxxx>
Date: Mon Nov 12 03:54:45 2018 +0000
exec: make de_thread() freezable
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14ee6217200000
start commit: c2239788 exec: make de_thread() freezable
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=16ee6217200000
console output: https://syzkaller.appspot.com/x/log.txt?x=12ee6217200000
kernel config: https://syzkaller.appspot.com/x/.config?x=73e2bc0cb6463446
dashboard link: https://syzkaller.appspot.com/bug?extid=b70f2aabc707c69c9239
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c9e26d400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14e1234d400000
Reported-by: syzbot+b70f2aabc707c69c9239@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: c2239788 ("exec: make de_thread() freezable")
