Comment 29 for bug 1895563

groovy: 20.10: 5.8.0-19-generic: incremental, no dry-run: Success (no panic).

Kernel version bisection:

cosmic: 18.10: 4.18.0-25-generic: incremental, dry-run: panic
disco: 19.04: 5.0.0-13-generic: incremental, dry-run: success. 105m19s (*insanely* fast).

Attempted revision bisection

Within disco tree:

git checkout -b mybisect origin/master
git bisect start
git bisect good Ubuntu-4.18.0-12.13
git bisect bad Ubuntu-5.0.0-10.11

This set my HEAD to:

commit 94710cac0ef4ee177a63b5227664b38c95bbf703 (HEAD, tag: v4.18)
Author: Linus Torvalds <email address hidden>
Date: Sun Aug 12 13:41:04 2018 -0700

    Linux 4.18

I then did a 'Kernel made' e.g.

cp -a /boot/config-`uname -r` .config
make oldconfig
make clean
custom=bbb01
make -j $(nproc) deb-pkg LOCALVERSION=-${custom}

The resulting kernel would boot but I could not ssh to it. systemctl would return error about not being able to connect to dbus.

I assumed there are Ubuntu specific bits to the kernel which systemctl requires so aborted.