Stuck builds on arm64 and ppc64le

recently, our builds on these platforms seem to get stuck without any error. Could you please provide some information whether there is (or soon will be) a fix or we should change these platforms to allow failures for now?

It seems it is working today. However, it is quite possible the cause was a problem with one of our tests because when I was looking into the build, it again got stuck on the same output as before until the whole build was completed successfully when all the output appeared all at once. So, the only issue seems to be with updating the log during the build.