::arc_compression_stats generates errors

Review Request #2527 - Created March 3, 2020 and submitted

Information
Jason King
illumos-gate
12279
Reviewers
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.

Jerry Jelinek
Jason King
Review request changed

Status: Closed (submitted)

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