> On Jan 1, 2020, at 10:57 PM, Wen Yang <wenyang@xxxxxxxxxxxxxxxxx> wrote: > > This issue was introduced by commit 693108a8a667 (“writeback: make bdi->min/max_ratio handling cgroup writeback aware”). Okay, this needs a Fixes tag then, and Cc the relevant people, i.e., Tejun and Jens at least. > > Finally, we will summarize the above cases and plan to write a general coccinelle rule to check for similar problems.