Minor I am launching JNLP slave in tests and wants to kill it once done. In same cases the testsuite can get stuck in following situation:
master:
"main" prio=10 tid=0x00007f2628008800 nid=0x7f70 in Object.wait() [0x00007f26302e1000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x000000008745d530> (a java.lang.UNIXProcess) at java.lang.Object.wait(Object.java:503) at java.lang.UNIXProcess.waitFor(UNIXProcess.java:263) - locked <0x000000008745d530> (a java.lang.UNIXProcess) at hudson.Proc$LocalProc.join(Proc.java:319) at hudson.Proc$LocalProc.kill(Proc.java:372) at jenkins.plugins.openstack.PluginTestRule$3.evaluate(PluginTestRule.java:227) at org.junit.rules.RunRules.evaluate(RunRules.java:20) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:264) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124) at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:200) at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103)
slave:
"main" prio=10 tid=0x00007fda4c009000 nid=0x2ba waiting on condition [0x00007fda559d7000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at hudson.remoting.Launcher.parseJnlpArguments(Launcher.java:338) at hudson.remoting.Launcher.run(Launcher.java:218) at hudson.remoting.Launcher.main(Launcher.java:192)
LocalProc.join waits forever, though it is enough to send kill -15 to the slave to recover.