The self-hosted runner: tt-metal-ci-vm-42 lost communication with the server. Verify the machine is running and has a healthy network connection. Anything in your workflow that terminates the runner process, starves it for CPU/Memory, or blocks its network access can cause this error.

Tenstorrent cards seem to be in use. Killing PIDs and exiting unsuccessfully. This can happen if a test hung and is normally an issue with the test, rather than infra.