[JIRA] [libvirt-slave] (JENKINS-24654) Using libvirt slave 'Before Job Snapshot' does not work, job starts executing immediately

Thu, 11 Sep 2014 01:44:02 -0700

Checked the Jenkins main log, seems there's a pretty obvious cause:

Sep 11, 2014 10:24:19 AM WARNING hudson.model.listeners.RunListener report
RunListener failed
java.lang.NullPointerException
	at hudson.plugins.libvirt.VirtualMachineSlaveComputer.disconnect(VirtualMachineSlaveComputer.java:59)
	at hudson.plugins.libvirt.LibvirtSnapshotRevertRunListener.revertVMSnapshot(LibvirtSnapshotRevertRunListener.java:85)
	at hudson.plugins.libvirt.LibvirtSnapshotRevertRunListener.onStarted(LibvirtSnapshotRevertRunListener.java:58)
	at hudson.model.listeners.RunListener.fireStarted(RunListener.java:213)
	at hudson.model.Run.execute(Run.java:1702)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:232)

Sep 11, 2014 10:24:19 AM WARNING hudson.model.AbstractBuild$AbstractBuildExecution reportError
Publisher hudson.tasks.junit.JUnitResultArchiver aborted due to exception
hudson.remoting.ChannelClosedException: channel is already closed
	at hudson.remoting.Channel.send(Channel.java:541)
	at hudson.remoting.Request.call(Request.java:129)
	at hudson.remoting.Channel.call(Channel.java:739)
	at hudson.EnvVars.getRemote(EnvVars.java:404)
	at hudson.model.Computer.getEnvironment(Computer.java:912)
	at jenkins.model.CoreEnvironmentContributor.buildEnvironmentFor(CoreEnvironmentContributor.java:29)
	at hudson.model.Run.getEnvironment(Run.java:2221)
	at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:885)
	at hudson.tasks.junit.JUnitResultArchiver.perform(JUnitResultArchiver.java:126)
	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:756)
	at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:720)
	at hudson.model.Build$BuildExecution.post2(Build.java:182)
	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:669)
	at hudson.model.Run.execute(Run.java:1731)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:232)
Caused by: java.io.IOException
	at hudson.remoting.Channel.close(Channel.java:1027)
	at hudson.remoting.Channel.close(Channel.java:1009)
	at hudson.plugins.libvirt.LibvirtSnapshotRevertRunListener.revertVMSnapshot(LibvirtSnapshotRevertRunListener.java:84)
	at hudson.plugins.libvirt.LibvirtSnapshotRevertRunListener.onStarted(LibvirtSnapshotRevertRunListener.java:58)
	at hudson.model.listeners.RunListener.fireStarted(RunListener.java:213)
	at hudson.model.Run.execute(Run.java:1702)
	... 3 more

Sep 11, 2014 10:24:19 AM WARNING hudson.model.AbstractBuild$AbstractBuildExecution reportError
Publisher hudson.tasks.Mailer aborted due to exception
hudson.remoting.ChannelClosedException: channel is already closed
	at hudson.remoting.Channel.send(Channel.java:541)
	at hudson.remoting.Request.call(Request.java:129)
	at hudson.remoting.Channel.call(Channel.java:739)
	at hudson.EnvVars.getRemote(EnvVars.java:404)
	at hudson.model.Computer.getEnvironment(Computer.java:912)
	at jenkins.model.CoreEnvironmentContributor.buildEnvironmentFor(CoreEnvironmentContributor.java:29)
	at hudson.model.Run.getEnvironment(Run.java:2221)
	at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:885)
	at hudson.tasks.Mailer.perform(Mailer.java:134)
	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:756)
	at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:720)
	at hudson.model.Build$BuildExecution.post2(Build.java:182)
	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:669)
	at hudson.model.Run.execute(Run.java:1731)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:232)
Caused by: java.io.IOException
	at hudson.remoting.Channel.close(Channel.java:1027)
	at hudson.remoting.Channel.close(Channel.java:1009)
	at hudson.plugins.libvirt.LibvirtSnapshotRevertRunListener.revertVMSnapshot(LibvirtSnapshotRevertRunListener.java:84)
	at hudson.plugins.libvirt.LibvirtSnapshotRevertRunListener.onStarted(LibvirtSnapshotRevertRunListener.java:58)
	at hudson.model.listeners.RunListener.fireStarted(RunListener.java:213)
	at hudson.model.Run.execute(Run.java:1702)
	... 3 more

The last two log entries aren't useful but included for completeness.

The npe is obvious when you look at the lines LibvirtSnapshotRevertRunListener:59 and LibvirtSnapshotRevertRunListener:85 since cause is always null.
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