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:1544608866:prepare_script
Running on runner-a334e492-project-1975139-concurrent-0 via runner-a334e492-gitlab-runner-autoscale-1544608610-a3cb2b53...
section_end:1544608868:prepare_script
section_start:1544608868:get_sources
Cloning repository...
Cloning into '/builds/BuildStream/buildstream'...
Checking out 5b6d52a6 as phil/source-checkout-options...
fatal: reference is not a tree: 5b6d52a601c10556ffe7ad1c7387cf5f4ae0c6e9
section_end:1544608874:get_sources
section_start:1544608874:upload_artifacts_on_failure
section_end:1544608875:upload_artifacts_on_failure
ERROR: Job failed: exit code 1