[Bug 297439] netmap: pipe peer teardown leaves a NULL kring array in netmap_monitor_stop()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297439

--- Comment #6 from 王雪阳 <[email protected]> ---
Reproducer dependency
  =====================

  The minimized reproducer uses the local syzkaller suffix
  ioctl$NIOCCTRL_SAFE. I have attached the exact FreeBSD netmap syscall
  description and constants needed to parse and rebuild this target.

  The base syzkaller source revision was:

      9f74d39908454b73546eaf1b8211b48b66e5c0fe

  NIOCCTRL_SAFE uses the normal kernel NIOCCTRL command. The suffix only
  selects the locally defined bounded nmreq_header_safe and
  nmreq_register_safe argument types.

  The successful execution settings remain:

      -threaded=1
      -repeat=0
      -procs=6
      -sandbox=none

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