error: pack-objects died of signal 9

git config pack.windowMemory 10m
git config pack.packSizeLimit 20m

gitlab.rb

omnibus_gitconfig['system'] = { "receive" => ["fsckObjects = true"],
                                "core" => ["packedGitLimit = 40m", "packedGitWindowSize = 40m"],
                                "pack" => ["deltaCacheSize = 40m", "packSizeLimit = 40m", "windowMemory = 40m", "threads = 1"] }

And changes will be propagated to /opt/gitlab/embedded/etc/gitconfig after gitlabctl reconfigure

sudo -u git bash
cd /var/opt/gitlab/git-data/repositories/{namespace}/{repository}.git
git gc --aggressive