My distribution is Gentoo Linux. This is a production system. When I upgraded from 5.1.16 to 5.2.1 and following kernels (untested with 5.2.11) the result was an unbootable system. In particular, I asked the datacenter support to connect a KVM console to the server and I watched what happened in the boot process. The result was "the GUID xyz could not be found". I have then checked /dev and nothing disk related was there. The driver is embedded <*> and the 5.1.16 config was taken with --oldconfig. If you need any more info I'll try to provide. See also: https://forums.gentoo.org/viewtopic-t-1099598.html
The issue was related to naming of devices. I'm not sure what really was the issue. Fact is the devices were not there. No /dev/disk/by-uuid/ or similar not even /dev/sda were present. Now I've compiled 5.2.13 and plugged a remote kvm console into the server. Which showed me that the network interface that was named `enp5s0` is now named `p5p1`. So it has to be some combination of kernel 5.2 and systemd 242 or 243rc1 243rc2
Created attachment 284905 [details] dmesg output