[Bug 244713] Processes hanging in "nfs" state

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244713

--- Comment #13 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kib
Date: Mon Mar 30 22:13:32 UTC 2020
New revision: 359473
URL: https://svnweb.freebsd.org/changeset/base/359473

Log:
  kern_sendfile.c: fix bugs with handling of busy page states.

  - Do not call into a vnode pager while leaving some pages from the
    same block as the current run, xbusy. This immediately deadlocks if
    pager needs to instantiate the buffer.
  - Only relookup bogus pages after io finished, otherwise we might
    obliterate the valid pages by out of date disk content.  While there,
    expand the comment explaining this pecularity.
  - Do not double-unbusy on error.  Split unbusy for error case, which
    is left in the sendfile_swapin(), from the more properly coded
    normal case in sendfile_iodone().
  - Add an XXXKIB comment explaining the serious bug in the validation
    algorithm, not fixed by this patch series.

  PR:   244713
  Reviewed by:  glebius, markj
  Tested by:    pho
  Sponsored by: The FreeBSD Foundation
  MFC after:    1 week
  Differential revision:        https://reviews.freebsd.org/D24038

Changes:
  head/sys/kern/kern_sendfile.c

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