[Bug 288345] poudriere run, hanging umounts, system fails to reboot due to hanging processes

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288345

--- Comment #22 from Craig Leres <leres@freebsd.org> ---
(In reply to Craig Leres from comment #19)
> Is there a problem with the way I have swap configured on this 
> box that is preventing savecore from working? This server runs
> zfs on six nvme drives.

Survey says YES!

    https://forums.freebsd.org/threads/cant-get-crash-dump.72304/

(As pointed out in this thread, the gmirror man page says dump to a gmirror is
tricky!)

So I think what I need to do is break up the mirror change swap/dump to use
just one of the six drives until I can get a crash dump, then recreate the
mirror.

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