Worker occasionally dies with "UpdateForWorker stream closed early"

  2026-01-21T20:58:46.749339Z ERROR nativelink_worker::running_actions_manager: RunningActionImpl did not cleanup. This is a violation of the requirements, will attempt to do it in the background., operation_id: 9c671a53-b7fc-4c2b-ba51-5639f1b064b5
    at nativelink-worker/src/running_actions_manager.rs:1415
    in nativelink_worker::local_worker::worker_start_action
    in nativelink_worker::local_worker::worker_start_action_ctx with operation_id: "9c671a53-b7fc-4c2b-ba51-5639f1b064b5", digest_function: BLAKE3
    in nativelink_worker::local_worker::run with shutdown_rx: broadcast::Receiver
    in nativelink::worker with name: "worker_0"

  2026-01-21T20:58:46.749389Z ERROR nativelink_worker::running_actions_manager: RunningActionImpl did not cleanup. This is a violation of the requirements, will attempt to do it in the background., operation_id: 6cac1188-bff7-4038-996f-4612bb138fe2
    at nativelink-worker/src/running_actions_manager.rs:1415
    in nativelink_worker::local_worker::worker_start_action
    in nativelink_worker::local_worker::worker_start_action_ctx with operation_id: "6cac1188-bff7-4038-996f-4612bb138fe2", digest_function: BLAKE3
    in nativelink_worker::local_worker::run with shutdown_rx: broadcast::Receiver
    in nativelink::worker with name: "worker_0"

  2026-01-21T20:58:59.487142Z ERROR nativelink_worker::local_worker: ERROR_MSG: "Actions in transit did not reach zero before we disconnected from the scheduler"
    at nativelink-worker/src/local_worker.rs:701
    in nativelink_worker::local_worker::run with shutdown_rx: broadcast::Receiver
    in nativelink::worker with name: "worker_0"


thread 'main' (24873374) panicked at src/bin/nativelink.rs:702:9:
Error { code: Internal, messages: ["UpdateForWorker stream closed early", "Actions in transit did not reach zero before we disconnected from the scheduler"] }

Start with nativelink-worker/src/local_worker.rs:701 and running_actions_manager.rs:1415, then trace the UpdateForWorker stream handling up to src/bin/nativelink.rs:702. Reproduce the worker disconnect using the reported logs and determine why actions in transit do not reach zero before the stream closes; done means the failure is understood and the worker no longer exits unexpectedly.