Comment 45 for bug 1768139

Using the lp:~ubuntu-kernel/ubuntu/+source/linux/+git/unstable repository, I was able to narrow the issue down to between two tags: Ubuntu-4.15.0-0 (issue present) and Ubuntu-4.14.0-17.20 (ubuntu-bionic, no issue present). I also tried Ubuntu-4.14.0-11.13 from the unstable branch which doesn't have the issue.

I tried bisecting in unstable, but as soon as I got a few commits back from Ubuntu-4.15.0-0 the build started failing.