[Bug 241808] bhyve e1000 broken after r354288

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241808

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: vmaffione
Date: Tue Nov 26 18:12:13 UTC 2019
New revision: 355117
URL: https://svnweb.freebsd.org/changeset/base/355117

Log:
  MFC r354659

  bhyve: rework mevent processing to fix a race condition

  At the end of both mevent_add() and mevent_update(), mevent_notify()
  is called to wakeup the I/O thread, that will call kevent(changelist)
  to update the kernel.
  A race condition is possible where the client calls mevent_add() and
  mevent_update(EV_ENABLE) before the I/O thread has the chance to wake
  up and call mevent_build()+kevent(changelist) in response to mevent_add().
  The mevent_add() is therefore ignored by the I/O thread, and
  kevent(fd, EV_ENABLE) is called before kevent(fd, EV_ADD), resuliting
  in a failure of the kevent(fd, EV_ENABLE) call.

  PR:     241808
  Reviewed by:    jhb, markj
  Differential Revision:  https://reviews.freebsd.org/D22286

Changes:
_U  stable/12/
  stable/12/usr.sbin/bhyve/mevent.c

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