The tag was temporarily added to jstests/core/crud_ops_do_not_throw_locktimeout.js to unblock progress, but must be revisited. That test runs a find cmd and expects it to block on a collection MODE_X lock, which can't happen with lock-free reads. We probably need to remove the find cmd testing from that JS test, as global MODE_X locks are only held for shutdown, startup and rollback operations, none of which we can provoke to run concurrently with find cmds.