Waiting for services to be up and running...
Pulling docker image docker:stable ...
Using docker image sha256:fd7e073eb60f300c2e6c7e4035e23fff313c3a72f73c704a52095f0db736e62e for docker:stable ...
section_start:1540468523:prepare_script
Running on runner-a334e492-project-1975139-concurrent-0 via runner-a334e492-gitlab-runner-autoscale-1540468223-0601b32d...
section_end:1540468525:prepare_script
section_start:1540468525:get_sources
Cloning repository...
Cloning into '/builds/BuildStream/buildstream'...
Checking out 9a9a61f0 as jennis/patch_remote_cache_docs...
fatal: reference is not a tree: 9a9a61f04c4fd3a8b937b054da6f652527b47d4c
section_end:1540468530:get_sources
section_start:1540468530:upload_artifacts_on_failure
section_end:1540468532:upload_artifacts_on_failure
ERROR: Job failed: exit code 1