Having issue in update the latest version of GitLAB.

Gitlab update failed in db migration. The exception trace is given below for your reference,

2017-11-19T05:56:34.673873000Z Migrating database...
2017-11-19T05:56:48.807180000Z Missing Rails.application.secrets.jws_private_key for production environment. The secret will be generated and stored in config/secrets.yml.
2017-11-19T05:56:50.217117000Z rake aborted!
2017-11-19T05:56:50.217417000Z StandardError: An error has occurred, all later migrations canceled:
2017-11-19T05:56:50.217937000Z namespace directory cannot be moved
2017-11-19T05:56:50.218209000Z /home/git/gitlab/app/models/concerns/storage/legacy_namespace.rb:20:in block in move_dir' 2017-11-19T05:56:50.218459000Z /home/git/gitlab/app/models/concerns/storage/legacy_namespace.rb:11:in each'
2017-11-19T05:56:50.218705000Z /home/git/gitlab/app/models/concerns/storage/legacy_namespace.rb:11:in move_dir' 2017-11-19T05:56:50.218976000Z /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:432:in block in make_lambda'
2017-11-19T05:56:50.219234000Z /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/activesupport-4.2.8/lib/active_support/callbacks.rb:228:in block in halting_and_conditional' 2017-11-19T05:56:50.232695000Z /home/git/gitlab/vendor/bundle/ruby/2.3.0/gems/rake-12.0.0/exe/rake:27:in <top (required)>'
2017-11-19T05:56:50.232922000Z Gitlab::UpdatePathError: namespace directory cannot be moved

@solidnerd Kindly help me to resolve this issue.

Start with app/models/concerns/storage/legacy_namespace.rb, especially move_dir, and review the database migration output showing “namespace directory cannot be moved.” Reproduce the GitLab update migration and identify the storage condition causing the failure; done means the migration completes without the Gitlab::UpdatePathError.