Gitlab::Git::CommandError: 13:GarbageCollect: cmd wait: exit status 128

https://sentry.gitlab.net/gitlab/gitlabcom/issues/739461/

GRPC::Internal: 13:GarbageCollect: cmd wait: exit status 128
  grpc/generic/active_call.rb:31:in `check_status'
    fail GRPC::BadStatus.new_status_exception(
  grpc/generic/active_call.rb:181:in `attach_status_results_and_complete_call'
    recv_status_batch_result.check_status
  grpc/generic/active_call.rb:377:in `request_response'
    attach_status_results_and_complete_call(batch_result)
  grpc/generic/client_stub.rb:178:in `block in request_response'
    c.request_response(req, metadata: metadata)
  grpc/generic/interceptors.rb:170:in `intercept!'
    return yield if @interceptors.none?
...
(53 additional frame(s) were not displayed)

Gitlab::Git::CommandError: 13:GarbageCollect: cmd wait: exit status 128
  git_garbage_collect_worker.rb:84:in `rescue in gitaly_call'
    raise Gitlab::Git::CommandError.new(e)
  git_garbage_collect_worker.rb:62:in `gitaly_call'
    def gitaly_call(task, repository)
  git_garbage_collect_worker.rb:29:in `perform'
    gitaly_call(task, project.repository.raw_repository)
  sidekiq/processor.rb:192:in `execute_job'
    worker.perform(*cloned_args)
  sidekiq/processor.rb:165:in `block (2 levels) in process'
    execute_job(worker, cloned(job_hash['args']))
...
(45 additional frame(s) were not displayed)

13:GarbageCollect: cmd wait: exit status 128