Started by upstream project "CE_gpkit_PR_pylint" build number 2445
originally caused by:
 GitHub pull request #1566 of commit e9c4333e75336a69bc9284a9697b386c8b352dfc, no merge conflicts.
Running as SYSTEM
[EnvInject] - Loading node environment variables.
Building remotely on macys in workspace /Users/jenkins/workspace/CE_gpkit_PR_pylint/buildnode/macys
Running Prebuild steps
Run condition [Execution node ] enabling prebuild for step [Execute shell]
[Execution node] check if [macys] is in [[macys, macys_VM]]
Run condition [Execution node ] enabling perform for step [Execute shell]
[macys] $ /bin/bash -xe /var/folders/xs/_fh4l1p54zqcl6mbk4zclcfr0000gp/T/jenkins3225844713008824789.sh
+ sleep 1s
Success build fororg.jenkinsci.plugins.conditionalbuildstep.singlestep.SingleConditionalBuilder@411a2553
The recommended git tool is: NONE
using credential 3614a4cf-01de-4393-97de-73734b7dd5a2
Wiping out workspace first.
Cloning the remote Git repository
Cloning repository https://github.com/convexengineering/gpkit
 > git init /Users/jenkins/workspace/CE_gpkit_PR_pylint/buildnode/macys # timeout=10
Fetching upstream changes from https://github.com/convexengineering/gpkit
 > git --version # timeout=10
 > git --version # 'git version 2.30.1 (Apple Git-130)'
using GIT_SSH to set credentials 
 > git fetch --tags --force --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
using GIT_SSH to set credentials 
 > git fetch --tags --force --progress -- https://github.com/convexengineering/gpkit +refs/pull/*:refs/remotes/origin/pr/* +refs/heads/master:refs/remotes/origin/master # timeout=10
Merging Revision ce5f77d8dd5ac1d3431992fe2f698456f8a407be (refs/remotes/origin/pr/1566/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 remote # timeout=10
 > git config --get remote.origin.url # timeout=10
using GIT_SSH to set credentials 
 > git merge --ff ce5f77d8dd5ac1d3431992fe2f698456f8a407be # timeout=10
 > git config core.sparsecheckout # timeout=10
 > git checkout -f ce5f77d8dd5ac1d3431992fe2f698456f8a407be # timeout=3
FATAL: Could not checkout ce5f77d8dd5ac1d3431992fe2f698456f8a407be
hudson.plugins.git.GitException: Command "git checkout -f ce5f77d8dd5ac1d3431992fe2f698456f8a407be" returned status code 128:
stdout: 
stderr: fatal: reference is not a tree: ce5f77d8dd5ac1d3431992fe2f698456f8a407be

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:2671)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.access$1100(CliGitAPIImpl.java:84)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:2989)
Also:   hudson.remoting.Channel$CallSiteStackTrace: Remote call to macys
		at hudson.remoting.Channel.attachCallSiteStackTrace(Channel.java:1797)
		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:143)
		at sun.reflect.GeneratedMethodAccessor879.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$CommandInvocationHandler.invoke(RemoteGitImpl.java:129)
		at com.sun.proxy.$Proxy131.execute(Unknown Source)
		at hudson.plugins.git.extensions.impl.PreBuildMerge.decorateRevisionToBuild(PreBuildMerge.java:93)
		at hudson.plugins.git.GitSCM.determineRevisionToBuild(GitSCM.java:1164)
		at hudson.plugins.git.GitSCM.checkout(GitSCM.java:1303)
		at hudson.scm.SCM.checkout(SCM.java:505)
		at hudson.model.AbstractProject.checkout(AbstractProject.java:1213)
		at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:637)
		at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:85)
		at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:509)
		at hudson.model.Run.execute(Run.java:1888)
		at hudson.matrix.MatrixRun.run(MatrixRun.java:153)
		at hudson.model.ResourceController.execute(ResourceController.java:99)
		at hudson.model.Executor.run(Executor.java:432)
Caused: hudson.plugins.git.GitException: Could not checkout ce5f77d8dd5ac1d3431992fe2f698456f8a407be
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl$9.execute(CliGitAPIImpl.java:3013)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$GitCommandMasterToSlaveCallable.call(RemoteGitImpl.java:158)
	at org.jenkinsci.plugins.gitclient.RemoteGitImpl$CommandInvocationHandler$GitCommandMasterToSlaveCallable.call(RemoteGitImpl.java:151)
	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$0(InterceptingExecutorService.java:78)
	at java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
	at java.lang.Thread.run(Thread.java:831)
[Pylint] Skipping execution of recorder since overall result is 'FAILURE'
[WS-CLEANUP] Deleting project workspace...
[WS-CLEANUP] Deferred wipeout is used...
[WS-CLEANUP] done
Finished: FAILURE