Started by upstream project "bcc-pr" build number 439
originally caused by:
 GitHub pull request #2856 of commit 683f139d0ac984cd8485dbf1cf9039d383168033, no merge conflicts.
Running as SYSTEM
Building remotely on ubuntu1710-slave-d2f (ubuntu1710) in workspace /home/iovisor/jenkins/workspace/bcc-pr/label/ubuntu1710
No credentials specified
Cloning the remote Git repository
Cloning repository https://github.com/iovisor/bcc.git
 > git init /home/iovisor/jenkins/workspace/bcc-pr/label/ubuntu1710 # timeout=10
Fetching upstream changes from https://github.com/iovisor/bcc.git
 > git --version # timeout=10
 > git fetch --tags --progress -- https://github.com/iovisor/bcc.git +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://github.com/iovisor/bcc.git # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://github.com/iovisor/bcc.git # timeout=10
Fetching upstream changes from https://github.com/iovisor/bcc.git
 > git fetch --tags --progress -- https://github.com/iovisor/bcc.git +refs/pull/*:refs/remotes/origin/pr/* # timeout=10
JENKINS-19022: warning: possible memory leak due to Git plugin usage; see: https://wiki.jenkins.io/display/JENKINS/Remove+Git+Plugin+BuildsByBranch+BuildData
Checking out Revision 66fc8f06e5b284f351c65431f586415004f55fc4 (refs/remotes/origin/pr/2856/merge)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 66fc8f06e5b284f351c65431f586415004f55fc4 # timeout=10
FATAL: Could not checkout 66fc8f06e5b284f351c65431f586415004f55fc4
hudson.plugins.git.GitException: Command "git checkout -f 66fc8f06e5b284f351c65431f586415004f55fc4" returned status code 128:
stdout: 
stderr: fatal: reference is not a tree: 66fc8f06e5b284f351c65431f586415004f55fc4

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2372)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$1000(CliGitAPIImpl.java:80)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2681)
Also:   hudson.remoting.Channel$CallSiteStackTrace: Remote call to ubuntu1710-slave-d2f
		at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1743)
		at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:357)
		at hudson.remoting.Channel.call(Channel.java:957)
		at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:146)
		at sun.reflect.GeneratedMethodAccessor348.invoke(Unknown Source)
		at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
		at java.lang.reflect.Method.invoke(Method.java:498)
		at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
		at com.sun.proxy.$Proxy174.execute(Unknown Source)
		at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1195)
		at hudson.scm.SCM.checkout(SCM.java:504)
		at hudson.model.AbstractProject.checkout(AbstractProject.java:1209)
		at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:574)
		at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
		at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:499)
		at hudson.model.Run.execute(Run.java:1816)
		at hudson.matrix.MatrixRun.run(MatrixRun.java:153)
		at hudson.model.ResourceController.execute(ResourceController.java:97)
		at hudson.model.Executor.run(Executor.java:429)
Caused: hudson.plugins.git.GitException: Could not checkout 66fc8f06e5b284f351c65431f586415004f55fc4
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2705)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$GitCommandMasterToSlaveCallable.call(RemoteGitImpl.java:161)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$GitCommandMasterToSlaveCallable.call(RemoteGitImpl.java:154)
	at hudson.remoting.UserRequest.perform(UserRequest.java:212)
	at hudson.remoting.UserRequest.perform(UserRequest.java:54)
	at hudson.remoting.Request$2.run(Request.java:369)
	at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
	at java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:844)
Finished: FAILURE