Started by an SCM change
Running as SYSTEM
[EnvInject] - Loading node environment variables.
Building remotely on workerls21cluster (cluster) in workspace /media/data/jenkins/workspace/isabelle-distributed
$ hg clone --rev default --noupdate https://isabelle.in.tum.de/repos/isabelle/ /media/data/jenkins/workspace/isabelle-distributed
ERROR: Failed to clone https://isabelle.in.tum.de/repos/isabelle/
java.io.IOException: Cannot run program "hg": error=0, Failed to exec spawn helper: pid: 196624, signal: 11
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1143)
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1073)
	at hudson.Proc$LocalProc.<init>(Proc.java:252)
	at hudson.Proc$LocalProc.<init>(Proc.java:221)
	at hudson.Launcher$LocalLauncher.launch(Launcher.java:994)
	at hudson.Launcher$ProcStarter.start(Launcher.java:506)
	at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:1395)
	at hudson.Launcher$RemoteLaunchCallable.call(Launcher.java:1337)
	at hudson.remoting.UserRequest.perform(UserRequest.java:211)
	at hudson.remoting.UserRequest.perform(UserRequest.java:54)
	at hudson.remoting.Request$2.run(Request.java:377)
	at hudson.remoting.InterceptingExecutorService.lambda$wrap$0(InterceptingExecutorService.java:78)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:840)
	Suppressed: hudson.remoting.Channel$CallSiteStackTrace: Remote call to workerls21cluster
		at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1787)
		at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:356)
		at hudson.remoting.Channel.call(Channel.java:1003)
		at hudson.Launcher$RemoteLauncher.launch(Launcher.java:1121)
		at hudson.Launcher$ProcStarter.start(Launcher.java:506)
		at hudson.Launcher$ProcStarter.join(Launcher.java:517)
		at hudson.plugins.mercurial.MercurialSCM.clone(MercurialSCM.java:832)
		at hudson.plugins.mercurial.MercurialSCM.checkout(MercurialSCM.java:602)
		at org.jenkinsci.plugins.multiplescms.MultiSCM.checkout(MultiSCM.java:143)
		at hudson.scm.SCM.checkout(SCM.java:540)
		at hudson.model.AbstractProject.checkout(AbstractProject.java:1248)
		at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:649)
		at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:85)
		at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:521)
		at hudson.model.Run.execute(Run.java:1895)
		at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:44)
		at hudson.model.ResourceController.execute(ResourceController.java:101)
		at hudson.model.Executor.run(Executor.java:442)
Caused by: java.io.IOException: error=0, Failed to exec spawn helper: pid: 196624, signal: 11
	at java.base/java.lang.ProcessImpl.forkAndExec(Native Method)
	at java.base/java.lang.ProcessImpl.<init>(ProcessImpl.java:314)
	at java.base/java.lang.ProcessImpl.start(ProcessImpl.java:244)
	at java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1110)
	... 15 more
ERROR: Failed to clone https://isabelle.in.tum.de/repos/isabelle/
Started calculate disk usage of build
Finished Calculation of disk usage of build in 0 seconds
Started calculate disk usage of workspace
Finished Calculation of disk usage of workspace in 0 seconds
Finished: FAILURE