Upgrade to 26.1.3 hung on startup at ">>> Invoking import script 'importer'"

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After upgrading from 26.1.2_5 to 26.1.3 my system hangs after reboot at

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>>> Invoking import script 'importer'
I tried booting into my previous boot environment, and got the same error, so there was no recovery with that.  Eventually I just pressed CTRL+C at the

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>>> Invoking import script 'importer' log message, and then, unexpectedly, the boot process proceeded past that, seemingly with no error (see screnshots below). 

After the system booted, most things work, except my monit and unbound services won't start.  I found the logs for monit and it won't start due to a syntax error in the config:

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/usr/local/etc/monitrc:39: syntax error 'httpscheck'
monit exiting due to parsing errors in the configuration file.
And for unbound:

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unbound-checkconf /var/unbound/unbound.conf
[1773169580] unbound-checkconf[19639:0] error: pythonmod: can't open file unbound-dnsbl/dnsbl_module.py for reading
[1773169580] unbound-checkconf[19639:0] fatal error: bad config during init for python module
I haven't been able to determine what the importer script does.  Something to do with loading or upgrading the config file?  Perhaps my monit service is failing because it wasn't able to make necessary changes for new syntax?

I also ran into this problem once with a different set of hardware, and wound up replacing the hardware due to unrelated changes I needed to make, so I don't think it's an issue with my hardware.  zpool status, dmesg, and memtest are clean.

Searching around I've not seen others with this issue, so it's definitely perplexing.  Certainly I need to figure out why my monit and unbound services aren't working, and prevent this from happening during the next upgrade.  Also, post-upgrade if I reboot I still have to CTRL+C out of the importer script.

[franco]

Can you press CTRL+T while it hangs and show what it says? It's likely probing disks and hanging there, which I haven't seen before.


Cheers,
Franco

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