[Bug gdb/19494] hang killing unfollowed fork children

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19494

--- Comment #2 from Pedro Alves <palves at redhat dot com> ---
Specifically, this:

static void
linux_nat_kill (struct target_ops *ops)
{
  struct target_waitstatus last;
  ptid_t last_ptid;
  int status;

  /* If we're stopped while forking and we haven't followed yet,
     kill the other task.  We need to do this first because the
     parent will be sleeping if this is a vfork.  */

  get_last_target_status (&last_ptid, &last);

  if (last.kind == TARGET_WAITKIND_FORKED
      || last.kind == TARGET_WAITKIND_VFORKED)
    {
      ptrace (PT_KILL, ptid_get_pid (last.value.related_pid), 0, 0);
      wait (&status);

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