[Bug 216586] zfs panic: sa.sa_magic == 0x2F505A in zfs_space_delta_cb()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216586

--- Comment #4 from johannes at jo-t.de ---
Thanks Andriy.

There are indeed lots of (very) old files there. I had an earlier snapshot from
a few years ago (that refs all these files). Deleted all files in the fs, and
rsync'd everything anew. No panic.

I've also tried (first rolling back to the old snapshot with all old files
present) rsync with either --xattrs present or not. Panics for both cases.
But the time until panic varies a lot. So looks like a race condition.

Question is now, is there bogus data (old format that wasn't properly upgraded
on-the-fly) with the correct checksum on the disk, and the current code trips
over it.
Or is the race condition still present when it tries to on-the-fly-upgrade old
files?

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