Debugging failing shepherd startup

[maya]

Hi,

I have an issue with my Guix configuration. From a certain update my
system fails to boot. It successfully boots into kernel and starts
shepherd. But after that shepherd fails to activate some necessary
service and the system is softlocked.

The problem is that I can't neither control the system in the booted
state at that point nor I can check the logs, as logd wasn't started
yet, so kernel messages are only preserved in memory and on the screen.

But I cannot scroll the screen, and can't interact with the system in
any way. I can at least display some of them with disabling silent
kernel, but the issue is the root cause is scrolled away too fast to be
read.

My question is, is there a way to debug this? I mostly need help with
identifying the failing service, once I have it, I think I can sort it
out.

Best regards,
Maya

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