Using Docker executor with image buildstream/testsuite-debian:9-master-123-7ce6581b ...
Pulling docker image buildstream/testsuite-debian:9-master-123-7ce6581b ...
Using docker image sha256:38f4a396dc81ff4b1d932443e9128db24704ff9ffba361dfa0a5b06da096a745 for buildstream/testsuite-debian:9-master-123-7ce6581b ...
section_start:1544021831:prepare_script
Running on runner-a334e492-project-1975139-concurrent-0 via runner-a334e492-gitlab-runner-autoscale-1544021584-cd28ff70...
section_end:1544021832:prepare_script
section_start:1544021832:get_sources
Cloning repository...
Cloning into '/builds/BuildStream/buildstream'...
Checking out 69ef3e5e as raoul/628-RE-flow-optimisation...
fatal: reference is not a tree: 69ef3e5e8885443c12abc4a53e23bb0d308fbedb
section_end:1544021839:get_sources
section_start:1544021839:upload_artifacts_on_failure
section_end:1544021840:upload_artifacts_on_failure
ERROR: Job failed: exit code 1