The first step on a multibranch pipeline is a checkout by the master to get the Jenkinsfile.
This checkout is made by something like a pseudo agent on master, even if the master have no executor available.
When you start a branch indexation on the multibranch job, it starts a build for each branch with a new commit (and it's what I like), but, if there is 20 branches needed to be builded, the master is starting 20 checkouts in parallel. And in some environments, it fails with a Git EOF error.
I need to limit the number of parallel git fetch on master for that, but there is no option.