[Box reboots with 2.6.24-openvz from git after Initiating processor 0] Doh! It was indeed descriptors moving in GDT. The following should fix it: git diff v2.6.24.. -- arch/x86/boot/compressed/head_64.S arch/x86/kernel/acpi/wakeup_64.S arch/x86/kernel/head_64.S include/asm-x86/segment_64.h >../1.patch patch -p1 -R <../1.patch