[Bug 233277] Panic when receiving incremental ZFS send (solaris assert: db->db_buf == ((void *)0))

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233277

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: mav
Date: Wed Nov 21 18:18:57 UTC 2018
New revision: 340737
URL: https://svnweb.freebsd.org/changeset/base/340737

Log:
  Revert r340096: 9952 Block size change during zfs receive drops spill block

  It was reported, and I easily reproduced it, that this change triggers panic
  when receiving replication stream with enabled embedded blocks, when short
  file compressing into one embedded block changes its block size.  I am not
  sure that the problem is in this particuler patch, not just triggered by it,
  but since investigation and fix will take some time, I've decided to revert
  this for now.

  PR:           198457, 233277

Changes:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_send.c

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