PROBLEM:        (DMO100204, HPXQ974C9)  (Patch ID: OSF375-350293)
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Processes such as wall or ntalkd, when connected to LAT terminal devices,
are hanging when attempting to close, possibly because the LAT sessions
have been disconnected abnormally.

A tstack trace in dbx of a hung process should look similar to this:

   0 thread_block()
   1 mpsleep()
   2 streams_mpsleep()
   3 latsclose()
   4 close_wrapper()
   5 csq_protect()
   6 osr_pop_subr()
   7 osr_close_subr()
   8 pse_close()
   9 speclose()
  10 clearalias()
  11 exit()
  12 rexit()
  13 syscall()
  14 _Xsyscall()