Failed to pull mirrored repo | commit-graph-chain.lock' file exists

For days mirroring from github is broken along with the CI. Nothing on the community since April https://forum.gitlab.com/t/pull-mirroring-failed/36656

2:Fetching remote upstream failed: fatal: Unable to create '/var/opt/gitlab/git-data/repositories/@hashed/4a/5c/4a5c32b8f00402007b6f12377a501f6a0fa5a0131e961e95c7ce90633e4b92ee.git/./objects/info/commit-graphs/commit-graph-chain.lock': File exists.

Another git process seems to be running in this repository, e.g.
an editor opened by 'git commit'. Please make sure all processes
are terminated then try again. If it still fails, a git process
may have crashed in this repository earlier:
remove the file manually to continue.

Is there a workaround or mirrors are broken now?