I detailed why this bug happens here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1518457/comments/126
this appears to be fixed by Mel Gorman's patch series to change memory reclaim from "per zone" to "per node": https://marc.info/?l=linux-mm&m=146797052519026
So this bug should be fixed with the latest kernel.
I detailed why this bug happens here: /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1518457/ comments/ 126
https:/
this appears to be fixed by Mel Gorman's patch series to change memory reclaim from "per zone" to "per node": /marc.info/ ?l=linux- mm&m=1467970525 19026
https:/
So this bug should be fixed with the latest kernel.