Just caught it in SSH Slaves plugin tests on my local machine:
Caused by: java.lang.NullPointerException
at com.trilead.ssh2.Connection.getReasonClosedCause(Connection.java:1556)
at hudson.plugins.sshslaves.SSHLauncher.reportTransportLoss(SSHLauncher.java:1420)
at hudson.plugins.sshslaves.SSHLauncher.afterDisconnect(SSHLauncher.java:1343)
at hudson.slaves.SlaveComputer$3.run(SlaveComputer.java:603)
at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Tirlead code does not check whether "this.tm" field is null before returning getReasonClosedCause from "this.tm". Just a minor defect
Bug
Minor