[Bug 220472] 11.1-RC1 kernel panic (zfs recv)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220472

--- Comment #1 from John Kennedy <warlock at phouka.net> ---
So I've done a bunch of I/O trying to narrow this down.  Between 20170526 and
20170528 on a system where I thought some SSD drives were failing (recoverable
checksum errors), I zfs sent | zfs recv the root disk (pool zroot) to a
different disk, which I then moved to a different (current) box.  Now I'm
trying to move it again, and running into problems.

It looks like I probably installed from installation media (11.0-RELEASE-p1 #0
r306420) and upgraded to -p10 after using beadm (possibly with some CMOS clock
offset looking at the timestamps, but that should all just be relative time). 
I was running FreeBSD 11.0-RELEASE-p10 #0 r317487+8c96ad701987(releng/11.0)
during the time that the bad snapshot I've done similar things before (and
similar things after) with no problems.  I can send|recv data from that
filesystem up to a point (@20170526) without issues, but kernel panic after
that.

Right now, it seems to be isolated to the "zroot" since I can receive
incrementals below that (ROOT, var, usr, etc).  I'm trying to narrow it down
some more.

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