[Bug 259093] [zfs] [panic] NULL pointer dereference on "zfs send --raw" of encrypted filesystem.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259093

--- Comment #1 from Peter Jeremy <peterj@FreeBSD.org> ---
I've modified my kernel to return an error, instead of panicing, and done some
investigating:
* The problem affects 3 (out of 81) filesystems I have.
* Those 3 filesystems don't have any unusual configuration.
* The encrypted pool reports no errors on a scrub.
* I still have the original pool (from before I did the encryption) and I can
do a "zfs send" of those filesystems from that pool without error.
* I created a third pool, with encryption enabled, and copied/encrypted those 3
filesystems from the original pool to the third pool.  Doing a send from that
pool fails in the same way.
* The error reports that it can't send an intermediate snapshot within the
filesystem (the snapshots are different for each filesystem).  If I delete the
snapshot that reports the error then the error moves to the next most recent
snapshot.
* Creating the third pool with a different encryption key has no effect
(unsurprising but I thought I'd check).

I'm doing a scrub of the original pool but would be surprised if it reports any
errors.

At this point, it looks like there's something in the original filesystems that
doesn't cause any issue with an unencrypted filesystem but breaks once that
filesystem is encrypted.

If anyone wants to investigate, I'm happy to share send streams from 2 of the
filesystems - with xz, one shrinks to 39.5MB and the other to 35.8MB.

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