Running just with tgt-boot-test in interactive mode, no user-data and no extra 
disk.
Issue still reproducible with that.

Saving the image to try different modifications while being able to get
back to the current state.

Then I started where Scott already experimented. The timeouts.
I was trying the big hammer first setting all of them.

# Inside:
sudo mount-image-callback --system-mounts disk.img /bin/bash

/etc/fstab:
LABEL=cloudimg-rootfs   /        ext4   
defaults,x-systemd.device-timeout=600,x-systemd.mount-timeout=600,_netdev       
0 0

$ mkdir etc/systemd/user.conf.d
$ echo DefaultTimeoutStartSec=600s > etc/systemd/user.conf.d/longtimeout.conf


I (accidentally) verified that without CPU limit this modified root disk would 
boot fine.
And will now run it with 40% over lunchtime (a bit less to more surely trigger 
it - and since I don't "wait" for it to complete lower % won't hurt).

But that still ran into the issues.
At least I have an emergency shell there interactively now that I can take a 
look before the next tries.
Also not only disk fails but also (probably dependency) Timed out waiting for 
device dev-ttyS0.device.

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https://bugs.launchpad.net/bugs/1732028

Title:
  timeout in iscsi boot fail with overlayroot [open-iscsi autopkg tests
  on LP Infra]

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