in case anyone's interested, the upstream fix is:
commit c4f9c701f9b44299e6adbc58d1a4bb2c40383494 Author: Huang Ying <email address hidden> Date: Thu Oct 15 20:06:07 2020 -0700 mm: fix a race during THP splitting
in case anyone's interested, the upstream fix is:
commit c4f9c701f9b4429 9e6adbc58d1a4bb 2c40383494
Author: Huang Ying <email address hidden>
Date: Thu Oct 15 20:06:07 2020 -0700
mm: fix a race during THP splitting