Racy code in 'Once-Only Initialization' section

[denpeshkov]

This code contains a race:

var initialized atomic.Int32

func maybeInit() {
    if initialized.CompareAndSwap(0, 1) {
        // initialize resources
    }
}

After the CAS operation succeeds - the initialized flag indicated that the resource is initialized, even when in reality it's still in progress of being initialized. If the other goroutine checks the initialized flag it can access an uninitialized object