Hi!
Can you share how you’re calling init_process_group, which initialization method you’re using, etc? If you get the first error on one machine and the second error on another, it is possible that the second error is caused by the first process crashing.
I’m asking because the read: Bad address error makes me think there is something going on with the TCP store. If you’re using the TCP initialization method, and try to use an IP that is no longer valid, for example, this is the type of error that could happen.