I can confirm having seen this (no time to debug). One method of recovery is to jump the node back into the ring with auto_bootstrap set to false and an appropriate token set, after deleting system tables. That assumes you're willing to have the node take a few bad reads until you're able to disablegossip and make other nodes not send requests to it. disabling thrift would also be advised, or even firewalling it prior to restart.
-- / Peter Schuller (@scode, http://worldmodscode.wordpress.com)
