[Bug 214721] [geom] [panic] graid panic: g_read_data: invalid length 262144

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214721

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: cem
Date: Thu Jan 12 06:58:32 UTC 2017
New revision: 311964
URL: https://svnweb.freebsd.org/changeset/base/311964

Log:
  g_raid: Prevent tasters from attempting excessively large reads

  Some g_raid tasters attempt metadata reads in multiples of the provider
  sectorsize.  Reads larger than MAXPHYS are invalid, so detect and abort
  in such situations.

  Spiritually similar to r217305 / PR 147851.

  PR:           214721
  Sponsored by: Dell EMC Isilon

Changes:
  head/sys/geom/raid/md_ddf.c
  head/sys/geom/raid/md_promise.c

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