PROBLEM: (93503, BCGML25N2) (PATCH ID: OSF440-872)
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Terminal code may block when allocating a buffer.   If a simple_lock is
held when blocking, a "simple lock owned" or "mcs_lock: lock already owned
by cpu" panic may occur.
A representative stack trace:

  panic
  simple_lock_fault
  mcs_lock_state_violation
  ptrselect
  spec_select
  vn_select
  undo_scan
  do_scan
  select
  syscall
  _Xsyscall