Error starting UDP tracker: `Failed to install stop signal: channel closed`

[josecelano]

Parent issue: #582
Relates to: #588

It seems it happens the same as for the API.

$ cargo run
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on build directory
    Finished dev [optimized + debuginfo] target(s) in 0.13s
     Running `target/debug/torrust-tracker`
Loading default configuration file: `./share/default/config/tracker.development.sqlite3.toml` ...
2024-01-09T17:45:32.300323306+00:00 [torrust_tracker::bootstrap::logging][INFO] logging initialized.
2024-01-09T17:45:32.300975932+00:00 [torrust_tracker::servers::udp::server][INFO] Running UDP Tracker on Socket: 0.0.0.0:6969
2024-01-09T17:45:32.300982552+00:00 [torrust_tracker::bootstrap::jobs::http_tracker][INFO] Note: Not loading Http Tracker Service, Not Enabled in Configuration.
2024-01-09T17:45:32.300985452+00:00 [torrust_tracker::bootstrap::jobs][INFO] TLS not enabled
thread 'tokio-runtime-worker' panicked at src/servers/signals.rs:52:25:
Failed to install stop signal: channel closed
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
2024-01-09T17:45:32.301093591+00:00 [API][INFO] API server started on http://127.0.0.1:1212
2024-01-09T17:45:32.301129991+00:00 [torrust_tracker::bootstrap::jobs::health_check_api][INFO] Starting Health Check API server: http://127.0.0.1:1313
2024-01-09T17:45:32.301174821+00:00 [torrust_tracker::bootstrap::jobs::health_check_api][INFO] Torrust Health Check API server started on: http://127.0.0.1:1313
^C2024-01-09T17:45:34.893773699+00:00 [torrust_tracker][INFO] Torrust shutting down..
2024-01-09T17:45:34.893775309+00:00 [torrust_tracker::servers::health_check_api::server][INFO] Stopping Torrust Health Check API server o http://127.0.0.1:1313 ...
2024-01-09T17:45:34.893814429+00:00 [torrust_tracker::servers::signals][INFO] Global shutdown signal processed
2024-01-09T17:45:34.893843209+00:00 [torrust_tracker::servers::signals][INFO] Shutting down tracker API server on socket address: 127.0.0.1:1212
2024-01-09T17:45:34.893846869+00:00 [torrust_tracker::servers::signals][INFO] Sending graceful shutdown signal
!! shuting down in 90 seconds !!
2024-01-09T17:45:34.893859928+00:00 [torrust_tracker::bootstrap::jobs::health_check_api][INFO] Health Check API server on http://127.0.0.1:1313 stopped
2024-01-09T17:45:34.893848648+00:00 [torrust_tracker::bootstrap::jobs::torrent_cleanup][INFO] Stopping torrent cleanup job..
2024-01-09T17:45:34.893902458+00:00 [torrust_tracker][INFO] Torrust successfully shutdown.

[josecelano]

It seems that adding the assert like in the PRs:

• Fix halt channel closed after starting HTTP tracker #593
• Fix broken grateful shutdown for tracker API #589

is not working in this case.

[josecelano]

For the record, @da2ce7 is working on improving how we start the UDP tracker. See #594 (comment)

The current solution does not handle a "gracefully" shutdown.