Possible runner system failure: "ERROR: Job failed: canceled"

Several jobs in several pipelines have failed with the message:

ERROR: Job failed: canceled

E.g.:

• https://gitlab.com/gitlab-org/gitlab-ce/pipelines/80086522/failures
• https://gitlab.com/gitlab-org/gitlab-ee/pipelines/80086564/failures
• https://gitlab.com/gitlab-org/gitlab-ee/pipelines/80081479/failures
• https://gitlab.com/gitlab-org/gitlab-ee/pipelines/80084357/failures