ThreadError: deadlock; recursive locking

https://sentry.gitlab.net/gitlab/gitlabcom/issues/1173922/

ThreadError: deadlock; recursive locking
  grpc/generic/client_stub.rb:47:in `new'
    Core::Channel.new(host, channel_args, creds)
  grpc/generic/client_stub.rb:47:in `setup_channel'
    Core::Channel.new(host, channel_args, creds)
  grpc/generic/client_stub.rb:102:in `initialize'
    @ch = ClientStub.setup_channel(channel_override, host, creds,
  grpc/generic/service.rb:157:in `initialize'
    super(host, creds, **kw)
  gitlab/gitaly_client.rb:45:in `new'
    klass.new(addr, creds, interceptors: interceptors)
...
(180 additional frame(s) were not displayed)

ThreadError: deadlock; recursive locking