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4168 ztest assertion failure in dbuf_undirty 4169 verbatim import causes zdb to segfault 4170 zhack leaves pool in ACTIVE state Reviewed by: Adam Leventhal <ahl@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Matthew Ahrens <mahrens@delphix.com> Approved by: Dan McDonald <danmcd@nexenta.com> References: https://www.illumos.org/issues/4168 https://www.illumos.org/issues/4169 https://www.illumos.org/issues/4170 illumos/illumos-gate@7fdd916c47 Ported-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #1775