Repository Mirror: Remote Upstream Failed, No Such Device or Address

Two of my repositories are now inexplicably failing Repo Sync’s.

Could anybody assist in what do I do to fix this?

You might be affected by this issue: https://gitlab.com/gitlab-org/gitlab-ce/issues/59053

this means if a user attempts to import enough repositories, mirroring will fail for some repositories.

Our engineer suggested a workaround:

Workaround: Go into the Repository settings, delete the pull mirror, and re-add credentials with a personal access token.

Hopefully that helps.