On Sat 19-01-19 08:09:34, Michal Hocko wrote: [...] > Fixes: 5e9d834a0e0c ("oom: sacrifice child with highest badness score for parent") So I've double checked and I was wrong blaming this commit. Back then it was tasklist_lock to protect us from releasing the task. It's been only since 6b0c81b3be11 ("mm, oom: reduce dependency on tasklist_lock") that we rely on the reference counting and unless I am missing something this is also the commit which has introduced this bug. > Cc: stable -- Michal Hocko SUSE Labs