Docker conflict, "already in use by container"

Hello !

Since I upgrade to the latest Gitlab CE, my pipelines are failing with those kinds of errors :

ERROR: Preparation failed: Error response from daemon: Conflict. The container name "/runner-465639a0-project-44-concurrent-3-build" is already in use by container "109a38a9e6ef215f4518992c652e04572e5977b5bfbef72d038a0cf1bb662946". You have to remove (or rename) that container to be able to reuse that name.

It happens when I push to a branch with an already running pipeline. To resolve that, I have to cancel my already running build and relaunch my latest commit pipeline that failed.

I am using Gitlab CE 9.4.3 and Gitlab-multi-runner 9.4.

Anyone have seen this ?

Thank you very much !

Main tracking issue is at gitlab-runner#4327 (closed)