Started by upstream project "<a href='/csi/job/CE_gpkit_PR_pylint/' class='jenkins-table__link model-link model-link--float'>CE_gpkit_PR_pylint</a>" build number <a href='/csi/job/CE_gpkit_PR_pylint/2383' class='jenkins-table__link model-link model-link--float'>2383</a>
originally caused by:
 GitHub pull request #1527 of commit 6146b2c2317a540a4f34cc75495a079e9d533def, no merge conflicts.
Running as SYSTEM
[EnvInject] - Loading node environment variables.
Building remotely on <a href='/csi/computer/macys_VM' class='jenkins-table__link model-link model-link--float'>macys_VM</a> in workspace /Users/jenkins/workspace/CE_gpkit_PR_pylint/buildnode/macys_VM
Running Prebuild steps
Run condition [Execution node ] enabling prebuild for step [Execute shell]
[Execution node] check if [macys_VM] is in [[macys, macys_VM]]
Run condition [Execution node ] enabling perform for step [Execute shell]
[macys_VM] $ /bin/bash -xe /var/folders/42/s1whb7rd4mddfcnzk96g_d9h0000gp/T/jenkins4247634020591156521.sh
+ sleep 9s
Success build fororg.jenkinsci.plugins.conditionalbuildstep.singlestep.SingleConditionalBuilder@67888c3e
The recommended git tool is: NONE
No credentials specified
Wiping out workspace first.
Cloning the remote Git repository
Cloning repository <a href='https://github.com/convexengineering/gpkit'>https://github.com/convexengineering/gpkit</a>
 &gt; git init /Users/jenkins/workspace/CE_gpkit_PR_pylint/buildnode/macys_VM # timeout=10
Fetching upstream changes from <a href='https://github.com/convexengineering/gpkit'>https://github.com/convexengineering/gpkit</a>
 &gt; git --version # timeout=10
 &gt; git --version # 'git version 2.17.2 (Apple Git-113)'
 &gt; git fetch --tags --progress -- <a href='https://github.com/convexengineering/gpkit'>https://github.com/convexengineering/gpkit</a> +refs/heads/*:refs/remotes/origin/* # timeout=10
 &gt; git config remote.origin.url <a href='https://github.com/convexengineering/gpkit'>https://github.com/convexengineering/gpkit</a> # timeout=10
 &gt; git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 &gt; git config remote.origin.url <a href='https://github.com/convexengineering/gpkit'>https://github.com/convexengineering/gpkit</a> # timeout=10
Fetching upstream changes from <a href='https://github.com/convexengineering/gpkit'>https://github.com/convexengineering/gpkit</a>
 &gt; git fetch --tags --progress -- <a href='https://github.com/convexengineering/gpkit'>https://github.com/convexengineering/gpkit</a> +refs/pull/*:refs/remotes/origin/pr/* +refs/heads/master:refs/remotes/origin/master # timeout=10
Merging Revision 44bf2d5afd03108cbaca99d05baf2853be5cdb99 (refs/remotes/origin/pr/1527/merge) to origin/master, UserMergeOptions{mergeRemote='origin', mergeTarget='master', mergeStrategy='DEFAULT', fastForwardMode='FF'}
 &gt; git rev-parse origin/master^{commit} # timeout=10
 &gt; git config core.sparsecheckout # timeout=10
 &gt; git checkout -f origin/master # timeout=3
 &gt; git remote # timeout=10
 &gt; git config --get remote.origin.url # timeout=10
 &gt; git merge --ff 44bf2d5afd03108cbaca99d05baf2853be5cdb99 # timeout=10
 &gt; git config core.sparsecheckout # timeout=10
 &gt; git checkout -f 44bf2d5afd03108cbaca99d05baf2853be5cdb99 # timeout=3
FATAL: Could not checkout 44bf2d5afd03108cbaca99d05baf2853be5cdb99
hudson.plugins.git.GitException: Command "git checkout -f 44bf2d5afd03108cbaca99d05baf2853be5cdb99" returned status code 128:
stdout: 
stderr: fatal: reference is not a tree: 44bf2d5afd03108cbaca99d05baf2853be5cdb99

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2450)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$1100(CliGitAPIImpl.java:84)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2767)
Also:   hudson.remoting.Channel$CallSiteStackTrace: Remote call to macys_VM
		at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1800)
		at hudson.remoting.UserRequest$ExceptionResponse.retrieve(UserRequest.java:356)
		at hudson.remoting.Channel.call(Channel.java:1001)
		at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler.execute(RemoteGitImpl.java:146)
		at sun.reflect.GeneratedMethodAccessor347.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$CommandInvocationHandler.invoke(RemoteGitImpl.java:132)
		at com.sun.proxy.$Proxy115.execute(Unknown Source)
		at hudson.plugins.git.extensions.impl.PreBuildMerge.decorateRevisionToBuild(PreBuildMerge.java:89)
		at hudson.plugins.git.GitSCM.determineRevisionToBuild(GitSCM.java:1161)
		at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1300)
		at hudson.scm.SCM.checkout(SCM.java:505)
		at hudson.model.AbstractProject.checkout(AbstractProject.java:1204)
		at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:636)
		at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
		at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:508)
		at hudson.model.Run.execute(Run.java:1907)
		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 44bf2d5afd03108cbaca99d05baf2853be5cdb99
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2791)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$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:211)
	at hudson.remoting.UserRequest.perform(UserRequest.java:54)
	at hudson.remoting.Request$2.run(Request.java:376)
	at hudson.remoting.InterceptingExecutorService.lambda$wrap$0(InterceptingExecutorService.java:78)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
[WS-CLEANUP] Deleting project workspace...
[WS-CLEANUP] Deferred wipeout is used...
[WS-CLEANUP] done
Finished: FAILURE