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 protected]>
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.


** Attachment added: "dmesg from 4.18.0-25-generic panic"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1895563/+attachment/5414734/+files/dmesg.202009261751

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https://bugs.launchpad.net/bugs/1895563

Title:
  Kernel Oops: Rsyncing to bcache device w/o backing cache kernel panic

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