problems with "success=N" action

I want to run a script when an authentication failure occurs. But, with the
following conf file, authenitcation always fails even when the proper
credentials are supplied.

    auth       [success=1 new_authtok_reqd=ok ignore=ignore default=bad]
pam_unix.so
    auth       optional     pam_exec.so  /usr/bin/log_failure
    password   required     pam_unix.so  md5

Authentication works by changing "success=1" to "success=ok", though
obviously the failure script will always run.

I tried looking through the source code of _pam_dispatch_aux and it doesn't
seem to return the first rule's return when there is no rule to jump to. If
I add another rule so there is something to jump to, everything works.

    auth       [success=1 new_authtok_reqd=ok ignore=ignore default=bad]
 pam_unix.so
    auth       optional     pam_exec.so  /usr/bin/log_failure
    auth       optional     pam_exec.so  /usr/bin/noop
    password   required     pam_unix.so  md5

Am I doing something wrong in my conf file, trying something that shouldn't
work, or is there a problem?

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