Does this issue reproduce with the latest release?
What operating system and processor architecture are you using (go env)?
I've seen intermittent failures on the golang build page for the ppc64 column, (never ppc64le) and the logs show that the failures are due to hangs when testing the runtime pkg. I have never been able to reproduce this, but I suspect it is due to the timeout value not being high enough because of its intermittent nature. It must be close to the limit and sometimes goes over due to other factors on the system.
I'm not sure what the preferred way to increase the timeout for ppc64 testing in this case to see if that will resolve this problem. I can make the change if someone tells me what it should be.