@GernotS That last panic is quite bizarre, and doesn't appear to be related to
encryption. We have an indirect block (level 1) of a space map, and it's
filled with a pattern like 0xdadada... but every 16th byte is incremented by
0x10. The block is in the L2ARC. Of course, checksums should have ensured
that even if the L2ARC is busted, we fall back on the regular pool data.
Could you check if the block is busted on disk, vs just in memory, by running
`zdb -ddddd zones 219` ?
Also, does the machine running this have ECC RAM?
```
> ffffff0dbe19e898::print dmu_buf_impl_t db_parent->db.db_data | /50J
0xffffff0dbeb82000: dadadadadadadada
dadadadadadadada dadadadadadadaea
dadadadadadadada dadadadadadadafa
dadadadadadadada dadadadadadada0a
dadadadadadadada dadadadadadada1a
dadadadadadadada dadadadadadada2a
dadadadadadadada dadadadadadada3a
dadadadadadadada dadadadadadada4a
dadadadadadadada dadadadadadada5a
dadadadadadadada dadadadadadada6a
dadadadadadadada dadadadadadada7a
dadadadadadadada dadadadadadada8a
dadadadadadadada dadadadadadada9a
dadadadadadadada dadadadadadadaaa
dadadadadadadada dadadadadadadaba
dadadadadadadada dadadadadadadaca
dadadadadadadada dadadadadadadada
dadadadadadadada dadadadadadadaea
dadadadadadadada dadadadadadadafa
dadadadadadadada dadadadadadada0a
dadadadadadadada dadadadadadada1a
dadadadadadadada dadadadadadada2a
dadadadadadadada dadadadadadada3a
dadadadadadadada dadadadadadada4a
dadadadadadadada dadadadadadada5a
dadadadadadadada
```
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