syzbot has bisected this bug to:
commit fb041bb7c0a918b95c6889fc965cdc4a75b4c0ca
Author: Will Deacon <will@xxxxxxxxxx>
Date: Thu Nov 21 11:59:00 2019 +0000
locking/refcount: Consolidate implementations of refcount_t
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=117e9e91e00000
start commit: 2c523b34 Linux 5.6-rc5
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=137e9e91e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=157e9e91e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a5295e161cd85b82
dashboard link: https://syzkaller.appspot.com/bug?extid=cea71eec5d6de256d54d
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164b5181e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166dd70de00000
Reported-by: syzbot+cea71eec5d6de256d54d@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: fb041bb7c0a9 ("locking/refcount: Consolidate implementations of refcount_t")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
