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The /var/lib/containerd/io.containerd.grpc.v1.introspection/uuid file stores a UUID to identify the particular containerd daemon responding to requests. The file should either exist with a UUID, or not exist. However, it has been observed that the file can be truncated with 0 bytes, which will then fail to be parsed as a valid UUID. As a defensive practice, detect a 0-length file and overwrite with a new UUID rather than failing. Fixes: https://github.com/containerd/containerd/issues/10491 Signed-off-by: Samuel Karp <samuelkarp@google.com>