[Bug 289204] Numa with 4 domains often fails to boot (zfs related)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289204

--- Comment #5 from Konstantin Belousov <kib@FreeBSD.org> ---
(In reply to Mark Johnston from comment #4)
Not clearing TDP_GEOM from the exiting thread is arguably the bug.
Why should a code be allowed to trigger event and then forget about it
if the thread is exiting, but forced to wait for idle if thread is returning
to userspace?  It is rather arbitrary.

Might be the wait for idle should occur earlier, indeed.  I think it must
happen in the running context of the thread before it is no longer runnable
due to exit.

https://reviews.freebsd.org/D52421

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