[Bug 218911] [uma] Memory corruption with certain item sizes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218911

--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: markj
Date: Wed Sep 13 21:54:38 UTC 2017
New revision: 323564
URL: https://svnweb.freebsd.org/changeset/base/323564

Log:
  Widen uk_pgoff, the slab header offset field.

  16 bits is only wide enough for kegs with an item size of up to 64KB.
  At that size or larger, slab headers are typically offpage because the
  item size is a multiple of the page size, but there is no requirement
  that this be the case.

  We can widen the field without affecting the layout of struct uma_keg
  since the removal of uk_slabsize in r315077 left an adjacent hole.

  PR:           218911
  MFC after:    2 weeks

Changes:
  head/sys/vm/uma_int.h

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