The Fedora QA folks have run into a regression with aacraid in the 4.16 rc kernels. This is not an issue with 4.15.x kernels. Essentially things just do not work unless 'aac_sync_mode=1' is passed on the command line. The failures show logs of aacraid: Host adapter abort request aacraid: Outstanding commands on (adapter) The reset request shows outstanding command : firmware-2 More details and logs are available in the Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=1557659 Thanks, Justin