On Mon, 4 Jul 2022 10:33:05 +0900 Naoya Horiguchi <naoya.horiguchi@xxxxxxxxx> wrote: > Originally copy_hugetlb_page_range() handles migration entries and hwpoisoned > entries in similar manner. But recently the related code path has more code > for migration entries, and when is_writable_migration_entry() was converted > to !is_readable_migration_entry(), hwpoison entries on source processes got > to be unexpectedly updated (which is legitimate for migration entries, but > not for hwpoison entries). This results in unexpected serious issues like > kernel panic when forking processes with hwpoison entries in pmd. > > Separate the if branch into one for hwpoison entries and one for migration > entries. > > ... > > Cc: <stable@xxxxxxxxxxxxxxx> # 5.18 It's unusual to have a cc:stable patch in the middle of a series like this. One would expect the fix to be a standalone thing against current -linus. As presented, this patch won't get into mainline until after 5.20-rc1. If that's OK then OK. Otherwise I can shuffle things around and stage this patch in mm-hotfixes?
