Before testing mainline, can you see if this bug exists in 4.13.0-21, which does not have the PTI patches? It can be downloaded from:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/13870500
Notes, you need to install both the linux-image and linux-image-extra .deb packages to test the kernel.
Before testing mainline, can you see if this bug exists in 4.13.0-21, which does not have the PTI patches? It can be downloaded from:
https:/ /launchpad. net/~canonical- kernel- team/+archive/ ubuntu/ ppa/+build/ 13870500
Notes, you need to install both the linux-image and linux-image-extra .deb packages to test the kernel.