package: src:linux version: 4.15.4-1 severity: minor forwarded: https://lkml.org/lkml/2017/12/18/1259 This is a message that shows up a lot in dmesg starting with linux 4.15. See LKML discussion and Ubuntu bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1749202 Best wishes, Mike