Text stacks not returning properly in some cases

[mihirmanna]

Using this PAM config file (example_config):

# sshd: auth account password session
auth       optional       pam_krb5.so use_kcminit
auth       optional       pam_ntlm.so try_first_pass
auth       optional       pam_mount.so try_first_pass
auth       required       pam_opendirectory.so try_first_pass
account    required       pam_nologin.so
account    required       pam_sacl.so sacl_service=ssh
account    required       pam_opendirectory.so
password   required       pam_opendirectory.so
session    required       pam_launchd.so
session    optional       pam_mount.so

Running the following command:

% python pam_parser.py -s -t session example_config

Yields this:

[Exit stack]
---------------------

Even though we should be seeing both session modules in the stack.