Freshly booted and mounted mirrored vdev of 2 SSDs. Executing a "zpool scrub tank" gets an immediate kernel panic and reboot.
I started scrolling through the other threads here mentioning kernel panics and found the advice to set
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sudo nvram boot-args="kernel_stack_pages=8"
in the thread about zpool import. Gave that a try, and it appears to have worked for me™. So, I strongly suspect the new codebase has some kind of common issue that is macos-version independent.
Additionally, probably apropos of nothing related, the previous version 1.9.? of zfs I was running appeared to have a runaway thread or something. It was spinning a full cpu and heating my house -- only showing up as a "kernel_task" in my explorations ... That had been going on for _months_. I had no clue whatsoever that it was zfs related. I am happy to report that runaway seems to have been vanquished upon installation of 2.0.1. Thank You!!!