Started by upstream project "gpkit_PullRequest_Models" build number 403
originally caused by:
 GitHub pull request #1431 of commit 43241f0a0c40c4c7ccbd46299905cbd2d6758931, no merge conflicts.
Running as SYSTEM
[EnvInject] - Loading node environment variables.
Building remotely on macys in workspace /Users/jenkins/workspace/gpkit_PullRequest_Models/buildnode/macys/optimizer/cvxopt
No credentials specified
Wiping out workspace first.
Cloning the remote Git repository
Cloning repository https://github.com/convexengineering/gpkit
 > git init /Users/jenkins/workspace/gpkit_PullRequest_Models/buildnode/macys/optimizer/cvxopt # timeout=10
Fetching upstream changes from https://github.com/convexengineering/gpkit
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/convexengineering/gpkit +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://github.com/convexengineering/gpkit # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://github.com/convexengineering/gpkit # timeout=10
Fetching upstream changes from https://github.com/convexengineering/gpkit
 > git fetch --tags --progress https://github.com/convexengineering/gpkit +refs/pull/*:refs/remotes/origin/pr/* +refs/heads/master:refs/remotes/origin/master # timeout=10
Merging Revision c30371cb51588a6e88f2a257d8d806bbbe00ded5 (refs/remotes/origin/pr/1431/merge) to origin/master, UserMergeOptions{mergeRemote='origin', mergeTarget='master', mergeStrategy='DEFAULT', fastForwardMode='FF'}
 > git rev-parse origin/master^{commit} # timeout=10
 > git config core.sparsecheckout # timeout=10
 > git checkout -f origin/master # timeout=3
 > git merge --ff c30371cb51588a6e88f2a257d8d806bbbe00ded5 # timeout=10
 > git config core.sparsecheckout # timeout=10
 > git checkout -f c30371cb51588a6e88f2a257d8d806bbbe00ded5 # timeout=3
FATAL: Could not checkout c30371cb51588a6e88f2a257d8d806bbbe00ded5
hudson.plugins.git.GitException: Command "git checkout -f c30371cb51588a6e88f2a257d8d806bbbe00ded5" returned status code 128:
stdout: 
stderr: fatal: reference is not a tree: c30371cb51588a6e88f2a257d8d806bbbe00ded5

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2318)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$900(CliGitAPIImpl.java:81)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2627)
Also:   hudson.remoting.Channel$CallSiteStackTrace: Remote call to macys
		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.GeneratedMethodAccessor295.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$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
		at com.sun.proxy.$Proxy117.execute(Unknown Source)
		at hudson.plugins.git.extensions.impl.PreBuildMerge.decorateRevisionToBuild(PreBuildMerge.java:88)
		at hudson.plugins.git.GitSCM.determineRevisionToBuild(GitSCM.java:1083)
		at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1176)
		at hudson.scm.SCM.checkout(SCM.java:504)
		at hudson.model.AbstractProject.checkout(AbstractProject.java:1208)
		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:1818)
		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 c30371cb51588a6e88f2a257d8d806bbbe00ded5
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2651)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$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$1.call(InterceptingExecutorService.java:72)
	at java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.lang.Thread.run(Thread.java:844)
INFO: Starting to record.
INFO: Processing JUnit
ERROR: Step ‘Publish xUnit test result report’ failed: [JUnit] - No test report file(s) were found with the pattern '**/test_reports/*.xml, **/test_reports_nounits/*.xml' relative to '/Users/jenkins/workspace/gpkit_PullRequest_Models/buildnode/macys/optimizer/cvxopt' for the testing framework 'JUnit'.
Did you enter a pattern relative to (and within) the workspace directory?
Did you generate the result report(s) for 'JUnit'?"
[WS-CLEANUP] Deleting project workspace...
[WS-CLEANUP] Deferred wipeout is used...
[WS-CLEANUP] done
Finished: FAILURE