[Bug 286700] Loader kmod loading errors vanish too quickly

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286700

--- Comment #2 from Piotr Smyrak <ps.ports@smyrak.com> ---
(In reply to Alexander Ziaee from comment #1)
Thank you for the suggestion, I was not aware of it. 

There would be caveats to using it though. 1. at this point it is only on
CURRENT. 2. even if it were on 14-STABLE and I was aware, I would be unable to
set this, since the system was unbootable. I am sure it is a great measure to
facilitate porting efforts from which it stemmed from, I believe. Perhaps it
would be worth to auto enable it if some keyboard control is down during boot?

For that matter, I have fixed the problem myself by dissecting and
understanding the 2 problems I observed, unbootable ZFS root and ENOENT when
trying to mount the affected zroot from a system booted with a laptop disk (NB,
laptop boot setup had also been affect by the same broken kernel, but the
laptop OS was unaffected as thankfully it is UFS based, yet it was unable to
hook desktop zroot exiting with ENOENT). 

A lesson learned is perhaps to record a boot environment before doing
installworld/installkernel.

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