A bbolt database has a freelist to track all pages that are available for allocation. However writing the list takes some time and reading the list sometimes panics. This commit sets NoFreelistSync true to skipping the freelist entirely, following what etcd does. https://github.com/etcd-io/etcd/blob/v3.5.2/server/mvcc/backend/config_linux.go#L31 Fixes #4838. Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>