zuul-cloner failed to update repo

Zuul cloner fails on testing:

2016-02-22 05:27:01.091 | Traceback (most recent call last):
2016-02-22 05:27:01.092 | File "/usr/zuul-env/bin/zuul-cloner", line 10, in <module>
2016-02-22 05:27:01.092 | sys.exit(main())
2016-02-22 05:27:01.092 | File "/usr/zuul-env/src/zuul/zuul/cmd/cloner.py", line 154, in main
2016-02-22 05:27:01.092 | cloner.main()
2016-02-22 05:27:01.092 | File "/usr/zuul-env/src/zuul/zuul/cmd/cloner.py", line 149, in main
2016-02-22 05:27:01.092 | cloner.execute()
2016-02-22 05:27:01.093 | File "/usr/zuul-env/src/zuul/zuul/lib/cloner.py", line 66, in execute
2016-02-22 05:27:01.093 | self.prepareRepo(project, dest)
2016-02-22 05:27:01.093 | File "/usr/zuul-env/src/zuul/zuul/lib/cloner.py", line 136, in prepareRepo
2016-02-22 05:27:01.093 | repo.reset()
2016-02-22 05:27:01.093 | File "/usr/zuul-env/src/zuul/zuul/merger/merger.py", line 90, in reset
2016-02-22 05:27:01.093 | self.update()
2016-02-22 05:27:01.094 | File "/usr/zuul-env/src/zuul/zuul/merger/merger.py", line 185, in update
2016-02-22 05:27:01.094 | origin.update()
2016-02-22 05:27:01.094 | File "/usr/zuul-env/local/lib/python2.7/site-packages/git/remote.py", line 536, in update
2016-02-22 05:27:01.094 | self.repo.git.remote(scmd, self.name, **kwargs)
2016-02-22 05:27:01.094 | File "/usr/zuul-env/local/lib/python2.7/site-packages/git/cmd.py", line 450, in <lambda>
2016-02-22 05:27:01.095 | return lambda *args, **kwargs: self._call_process(name, *args, **kwargs)
2016-02-22 05:27:01.095 | File "/usr/zuul-env/local/lib/python2.7/site-packages/git/cmd.py", line 902, in _call_process
2016-02-22 05:27:01.095 | return self.execute(make_call(), **_kwargs)
2016-02-22 05:27:01.095 | File "/usr/zuul-env/local/lib/python2.7/site-packages/git/cmd.py", line 695, in execute
2016-02-22 05:27:01.096 | raise GitCommandError(command, status, stderr_value)
2016-02-22 05:27:01.096 | git.exc.GitCommandError: 'git remote update origin' returned with exit code 1
2016-02-22 05:27:01.096 | stderr: 'error: fetch died of signal 15
2016-02-22 05:27:01.096 | error: Could not fetch origin'

Build job: http://logs.openstack.org/32/282932/1/check/gate-anchor-docs/2f04617/console.html