Comment 4 for bug 1938269

I've been trying to gather some more data on this, and here's what I have so far...
I added a config for eth0 in /etc/systemd/network so that the test (which replaces eth netplan config with wifi config temporarily) doesn't leave us without the ability to reconnect.

Testing with dawson-uc18-m7-20190122-10 and stock uc18 after a snap refresh with current pc-kernel, it seems to sometimes work, sometimes crash and I can never reconnect, and sometimes it boots back up and I can ssh in again (and see 0m uptime)

Using the current stable image, I get the same behavior though... it's pretty random, so it's hard to say when this started happening:
pc-kernel 4.15.0-151.157 805 18/stable canonical kernel

Reverting the kernel to the one that was on the image for the dawson-uc18 image:
pc-kernel 4.15.0-44.47 182 18/stable canonical kernel
...This one is very old, I know, but after about 50 attempts, I haven't been able to reproduce it with this kernel.

Using the current stable kernel again, and reverting core18 to rev 1081 (which was on the image originally), I was somehow (maybe dumb luck?) about to still reproduce a problem, but it was in a state where I could still ssh to it. I could not run snap, ps, or almost anything else, but I could at least find this oops in dmesg: https://pastebin.canonical.com/p/jsctQmJZGc/