A significant kernel side-channel attack vulnerability has been identified; patches should be available soon. Users should be aware that once patches are available, it will be necessary to take machines down to patch this significant security vulnerability. This includes Crane and Anvil, and possibly Tusker and Sandhills. We anticipate this maintenance will happen as soon as tomorrow morning.
More details will be sent as they become available.
Happy New Year ...
We realize an unexpected shutdown is never preferred, but since classes start next week and all clusters were subject to well-known exploits, it was not possible to give more notice. We ourselves were waiting on the release of a patched kernel, which was fortunately released days earlier than originally anticipated.
All jobs that were killed will be rescheduled. This patch may cause performance degradation on Intel processors (Crane, Anvil). Please let us know asap if you notice a significant slowing of your application, and we will work to mitigate this wherever possible.