The gcm module uses the local request lib from utils/request.js
This lib auto retries the connection and has no limitation on retries.

Example: If there is some snake oil in the network or on the host machine like an "endpoint protection" which injects ssl certs this will be retried with something like "Error: SSL Cert self signed certificate in certificate chain" but will NEVER raise any exception or give up retrying.

I guess this would finally fail after round about 10-11 days with Maximum call stack size exceeded (max stack size default in node 984, 15 seconds wait time ... you do the math).