Ran out of RAM for cloud builds - Google generally does not use virtual memory for anything in the cloud, because it leads to unpredictable, massive delays which can cause cascading failures in services.<p>It was still &quot;possible&quot; to build on your workstation, but the locality patterns in linking and subsequent thrashing made this extremely an extremely small value of &quot;possible&quot;.  I recall once during this period I kicked off a local debug build on my workstation on Friday afternoon, went home for the weekend, and it was still running when I got into work on Monday morning.  By Tuesday, I had given up and killed it.