CI can't clone after 8.0 migration

I recentrly upgraded my gitlab server to 8.0, migrated my CI data using the CI migration guide, and push some commits, but now all my builds failed because it cannot fetch data.

docker runner states :

Cloning repository...
Cloning into '/builds/ns/project'...
fatal: Authentication failed for 'https://gitlab-ci-token:d33[...]a6@git.geekwu.org/ns/project.git/'

ERROR: Build failed with: exit code 128

I've tried to re-register runners but got no more success

I've tried to change the CI token without success

git clone the url fails too, as intended

NB: the projects are private, but was built with gitlab 7.x