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[all variants] Kernel doesn't seem to support more that 64GiB of RAM

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I've been testing KVM-Qemu virtual machines assigning them different ammounts of memory, and everytime booting from .iso files (Lubuntu 14.04 i386, Lubuntu 14.04 amd64, Debian Live 7.5 amd64 CLI, Fedora 20 amd64 Gnome)

In all cases virtual environment starts until the Live boot manager, all distributions and variants boot if RAM is less than 65000 MiB, and in all distributions the Kernel freezes if KVM assigns 65100 MiB or more (tested with 100GiB too).

Hardware host has vmx BIOS extensions enabled and runs Debian GNU/Linux 7.5 (x86_64)

Does anybody know some workaround to Ubuntu works with more than 64GiB (in KVM-Qemu virtual machine or in a real hardware) ?

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