syzbot has bisected this issue to:
commit 167dcfc08b0b1f964ea95d410aa496fd78adf475
Author: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Date: Tue Dec 15 20:56:41 2020 +0000
x86/mm: Increase pgt_buf size for 5-level page tables
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13fe3ea8d00000
start commit: a99163e9 Merge tag 'devicetree-for-5.12' of git://git.kern..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=10013ea8d00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17fe3ea8d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=49116074dd53b631
dashboard link: https://syzkaller.appspot.com/bug?extid=42a71c84ef04577f1aef
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=141f3f04d00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17de4f12d00000
Reported-by: syzbot+42a71c84ef04577f1aef@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 167dcfc08b0b ("x86/mm: Increase pgt_buf size for 5-level page tables")
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
