In SAML either the Assertion or the SAML message (i.e. Request, Response) can be signed. When the SP receives a PAOS response it checks the signature in lasso_login_process_paos_response_msg(). As long as the signature was on the Response everything worked as expected. But if it was the Assertion that was signed instead of the response then lasso_login_process_paos_response_msg() incorrectly responds with the LASSO_DS_ERROR_SIGNATURE_NOT_FOUND error.
Upstream bug (there is no bug tracker for this bug database) https://dev.entrouvert.org/issues/26828
Problem first reported by OpenStack Keystone team when testing K2K. See https://bugs.launchpad.net/keystone/+bug/1794726
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