::arc_compression_stats generates errors

Review Request #2527 — Created March 3, 2020 and submitted — Latest diff uploaded

jbk
illumos-gate
12279
general

The dcmd can induce mdb_ctf_vread() to read unmapped memory in the target due to the way arc_buf_hdr_ts are allocated, causing errors or failures of the dcmd.

With changes, dcmd no longer fails.

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