+++ This bug was initially created as a clone of Bug #492978 +++ The problem appears in the guest system while compiling app-emulation/virtualbox-guest-additions-4.2.18. Tried 2 times and got the same error. Buildlog attached. Host system: Gentoo amd64. Guest system: Gentoo amd64. Guest configuration: 1024 MB memory, 2048 MB swap, VT-x/AMD-V enabled, Nested Paging disabled (it was very slow with Nested Paging enabled). I've got no problem with memory on the host system and on another (x86) guest systems. This case could be related: http://forums-lb.gentoo.org/viewtopic-p-7395278.html?sid=7904ea3cfe04367039bcd09a5845edb1 Reproducible: Always Steps to Reproduce: 1. emerge -v virtualbox-guest-additions