shaka-lab-hub stuck after some kind of network failure

[joeyparrish]

According to our logs, our shaka-lab-hub service got into a bad state. The network may have been down when the job started, leading it to complain that it couldn't bind to a non-localhost IP. However, the job stayed "up" in spite of not being functional. Had the service quit at that error, it would have restarted until it was able to run.

Here are the logs from sudo journalctl -xu shaka-lab-hub:

-- Boot 79734be3001a4c92a2bba28a3f6ad2b6 --
Mar 09 22:47:50 shaka-test-linux systemd[1]: Started Shaka Lab Hub.
░░ Subject: A start job for unit shaka-lab-hub.service has finished successfully
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit shaka-lab-hub.service has finished successfully.
░░ 
░░ The job identifier is 207.
Mar 09 22:47:50 shaka-test-linux start-hub.sh[907]: 22:47:50.933 INFO [GridLauncherV3.parse] - Selenium server version: 3.141.59, revision: e82be7d358
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: 22:47:51.002 INFO [GridLauncherV3.lambda$buildLaunchers$5] - Launching Selenium Grid hub on port 4444
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: 2024-03-09 22:47:51.382:INFO::main: Logging initialized @735ms to org.seleniumhq.jetty9.util.log.StdErrLog
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: Exception in thread "main" java.lang.RuntimeException: Error initializing the hub Could not find a non-loopback ip4 address for this mach>
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: System info: host: 'shaka-test-linux', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '5.15.0-100-generic', java.versio>
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: Driver info: driver.version: unknown
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.grid.web.Hub.initServer(Hub.java:228)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.grid.web.Hub.start(Hub.java:243)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.grid.selenium.GridLauncherV3.lambda$buildLaunchers$5(GridLauncherV3.java:265)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.grid.selenium.GridLauncherV3.lambda$launch$0(GridLauncherV3.java:86)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at java.base/java.util.Optional.map(Optional.java:265)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.grid.selenium.GridLauncherV3.launch(GridLauncherV3.java:86)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.grid.selenium.GridLauncherV3.main(GridLauncherV3.java:70)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: Caused by: org.openqa.selenium.WebDriverException: Could not find a non-loopback ip4 address for this machine
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: System info: host: 'shaka-test-linux', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '5.15.0-100-generic', java.versio>
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]: Driver info: driver.version: unknown
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.selenium.net.NetworkUtils.getIp4NonLoopbackAddressOfThisMachine(NetworkUtils.java:73)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.grid.web.Hub.updateHostToNonLoopBackAddressOfThisMachine(Hub.java:309)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         at org.openqa.grid.web.Hub.initServer(Hub.java:188)
Mar 09 22:47:51 shaka-test-linux start-hub.sh[907]:         ... 6 more
Mar 11 19:11:07 shaka-test-linux systemd[1]: Stopping Shaka Lab Hub...

The service started, failed but didn't die, then stayed like that for two days until I restarted it.