When I ran the following command, I always got stuck when updating the etcd-incubator. Any idea? I tried on multiple machines and they all hang at the same place. Is it possible that this is a problem in github?

The console info is:
prompt> ./update

===> Uncommitted submodules changes will be clobbered <===


===> Unversioned changes will be clobbered <===

+ has_upstream
+ git rev-parse '@{u}'
+ git pull
Already up-to-date.
+ git submodule sync
+ git submodule foreach --recursive 'git submodule sync; git clean -d --force --force'
+ git submodule update --init --recursive
Submodule 'shared' (https://github.com/cloudfoundry/shared-release-packages.git) registered for path 'shared'
Submodule 'src/cloud_controller_ng' (https://github.com/cloudfoundry/cloud_controller_ng.git) registered for path 'src/cloud_controller_ng'
Submodule 'src/collector' (https://github.com/cloudfoundry/collector.git) registered for path 'src/collector'
Submodule 'src/dea_next' (https://github.com/cloudfoundry/dea_ng.git) registered for path 'src/dea_next'
Submodule 'src/etcd-metrics-server' (https://github.com/cloudfoundry-incubator/etcd-metrics-server.git) registered for path 'src/etcd-metrics-server'
Submodule 'src/etcd-release' (https://github.com/cloudfoundry-incubator/etcd-release.git) registered for path 'src/etcd-release'
Submodule 'src/github.com/cloudfoundry-incubator/routing-api' (https://github.com/cloudfoundry-incubator/routing-api.git) registered for path 'src/github.com/cloudfoundry-incubator/routing-api'
Submodule 'src/github.com/cloudfoundry/cf-acceptance-tests' (https://github.com/cloudfoundry/cf-acceptance-tests) registered for path 'src/github.com/cloudfoundry/cf-acceptance-tests'
Submodule 'src/github.com/cloudfoundry/gorouter' (https://github.com/cloudfoundry/gorouter) registered for path 'src/github.com/cloudfoundry/gorouter'
Submodule 'src/gnatsd' (https://github.com/apcera/gnatsd.git) registered for path 'src/gnatsd'
Submodule 'src/hm9000' (https://github.com/cloudfoundry/hm-workspace.git) registered for path 'src/hm9000'
Submodule 'src/loggregator' (https://github.com/cloudfoundry/loggregator) registered for path 'src/loggregator'
Submodule 'src/smoke-tests' (https://github.com/cloudfoundry/cf-smoke-tests) registered for path 'src/smoke-tests'
Submodule 'src/statsd-injector' (https://github.com/cloudfoundry/statsd-injector.git) registered for path 'src/statsd-injector'
Submodule 'src/uaa' (https://github.com/cloudfoundry/uaa.git) registered for path 'src/uaa'
Submodule 'src/warden' (https://github.com/cloudfoundry/warden.git) registered for path 'src/warden'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/shared/.git/
remote: Counting objects: 1560, done.
remote: Total 1560 (delta 0), reused 0 (delta 0), pack-reused 1560
Receiving objects: 100% (1560/1560), 380.81 KiB, done.
Resolving deltas: 100% (589/589), done.
Submodule path 'shared': checked out '87112bae91127792ffbed7fc6c76ac7088708ace'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/cloud_controller_ng/.git/
remote: Counting objects: 66064, done.
remote: Compressing objects: 100% (107/107), done.
remote: Total 66064 (delta 26), reused 0 (delta 0), pack-reused 65955
Receiving objects: 100% (66064/66064), 17.75 MiB | 4.32 MiB/s, done.
Resolving deltas: 100% (45227/45227), done.
Submodule path 'src/cloud_controller_ng': checked out 'ff442527f0bee06cb6ea6baa22175905a92fc718'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/collector/.git/
remote: Counting objects: 2488, done.
remote: Total 2488 (delta 0), reused 0 (delta 0), pack-reused 2488
Receiving objects: 100% (2488/2488), 9.19 MiB | 5.23 MiB/s, done.
Resolving deltas: 100% (1411/1411), done.
Submodule path 'src/collector': checked out 'c38732735b36ed3ee9e44ee9bf91dce07bedd63b'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/dea_next/.git/
remote: Counting objects: 12737, done.
remote: Compressing objects: 100% (3/3), done.
remote: Total 12737 (delta 0), reused 0 (delta 0), pack-reused 12734
Receiving objects: 100% (12737/12737), 15.25 MiB | 4.26 MiB/s, done.
Resolving deltas: 100% (7014/7014), done.
Submodule path 'src/dea_next': checked out 'b74390b2472a6a929807040f4439a30ecb46e699'
Submodule 'go/src/github.com/cloudfoundry/gosteno' (https://github.com/cloudfoundry/gosteno.git) registered for path 'go/src/github.com/cloudfoundry/gosteno'
Submodule 'go/src/github.com/howeyc/fsnotify' (https://github.com/howeyc/fsnotify.git) registered for path 'go/src/github.com/howeyc/fsnotify'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/dea_next/go/src/github.com/cloudfoundry/gosteno/.git/
remote: Counting objects: 436, done.
remote: Total 436 (delta 0), reused 0 (delta 0), pack-reused 436
Receiving objects: 100% (436/436), 105.20 KiB, done.
Resolving deltas: 100% (222/222), done.
Submodule path 'go/src/github.com/cloudfoundry/gosteno': checked out 'c6379cb7ef097850eec4dc61e1730bbb99a2a2a8'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/dea_next/go/src/github.com/howeyc/fsnotify/.git/
remote: Counting objects: 660, done.
remote: Total 660 (delta 0), reused 0 (delta 0), pack-reused 660
Receiving objects: 100% (660/660), 168.97 KiB, done.
Resolving deltas: 100% (382/382), done.
Submodule path 'go/src/github.com/howeyc/fsnotify': checked out '08040c5a90632bd721465eb8ad74a8e61bd7bf95'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/etcd-metrics-server/.git/
remote: Counting objects: 1658, done.
remote: Total 1658 (delta 0), reused 0 (delta 0), pack-reused 1658
Receiving objects: 100% (1658/1658), 591.04 KiB, done.
Resolving deltas: 100% (757/757), done.
Submodule path 'src/etcd-metrics-server': checked out '90c444c7f93cacb998e45c46f1e06ecf4c8eb9c4'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/etcd-release/.git/
remote: Counting objects: 1546, done.
remote: Total 1546 (delta 0), reused 0 (delta 0), pack-reused 1546
Receiving objects: 100% (1546/1546), 1.50 MiB | 2.22 MiB/s, done.
Resolving deltas: 100% (396/396), done.
Submodule path 'src/etcd-release': checked out '6722dd34e92e760c6e34134224cd3323215c7817'
Submodule 'src/etcd' (https://github.com/coreos/etcd.git) registered for path 'src/etcd'
Submodule 'src/github.com/cloudfoundry-incubator/cf-test-helpers' (http://github.com/cloudfoundry-incubator/cf-test-helpers.git) registered for path 'src/github.com/cloudfoundry-incubator/cf-test-helpers'
Submodule 'src/github.com/coreos/go-etcd' (http://github.com/coreos/go-etcd.git) registered for path 'src/github.com/coreos/go-etcd'
Submodule 'src/github.com/nu7hatch/gouuid' (http://github.com/nu7hatch/gouuid.git) registered for path 'src/github.com/nu7hatch/gouuid'
Submodule 'src/github.com/onsi/ginkgo' (http://github.com/onsi/ginkgo.git) registered for path 'src/github.com/onsi/ginkgo'
Submodule 'src/github.com/onsi/gomega' (http://github.com/onsi/gomega.git) registered for path 'src/github.com/onsi/gomega'
Submodule 'src/github.com/ugorji/go' (http://github.com/ugorji/go.git) registered for path 'src/github.com/ugorji/go'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/etcd-release/src/etcd/.git/
remote: Counting objects: 29815, done.
remote: Compressing objects: 100% (31/31), done.
remote: Total 29815 (delta 6), reused 0 (delta 0), pack-reused 29783
Receiving objects: 100% (29815/29815), 17.07 MiB | 6.59 MiB/s, done.
Resolving deltas: 100% (18339/18339), done.
Submodule path 'src/etcd': checked out '6335fdc595ff03d27007db04e5b545189b9647c6'
Initialized empty Git repository in /local/install/users/cfg/workspace/cf-release/src/etcd-release/src/github.com/cloudfoundry-incubator/cf-test-helpers/.git/
(hang!)