Testnet halted; Core Dump provided

Overnight the Irona testnet came to a halt, with a provided core-dump. This core-dump is currently being evaluated, while more investigation is ongoing to the server this test net was deployed on.

Restarting the witness brings it back online for a few minutes, until it crashes again. Its possible to restart the chain from scratch, but without finding the reason for the halt; we will experience the same in the future..