We are seeing the bug originally described in JENKINS-62181. Remote agents hang on launch. This is using a supposedly patched release.

In our experience, we are seeing a correct launch of this agent the first time after Jenkins is rebooted. Then, after the agent times out (in-demand delay 1, idle delay 5) and goes down, it cannot be restarting, it deadlocks on launch.

It hangs here:

<===[JENKINS REMOTING CAPACITY]===>channel started
Remoting version: 4.3
This is a Unix agent

I don't know how to put in a test for Java deadlocks. Please advise. This is blocking usage.