18:03:46 + git checkout -f refs/remotes/jenkins_tmp
18:03:46 fatal: Unable to create '/home/iojs/build/workspace/node-test-binary-arm/.git/index.lock': File exists.
18:03:46 
18:03:46 Another git process seems to be running in this repository, e.g.
18:03:46 an editor opened by 'git commit'. Please make sure all processes
18:03:46 are terminated then try again. If it still fails, a git process
18:03:46 may have crashed in this repository earlier:
18:03:46 remove the file manually to continue.
18:03:46 Build step 'Execute shell' marked build as failure