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...m> date: Mon Sep 13 17:00:10 2010 +0100 files: xen/common/page_alloc.c description: page_alloc: Check neighbouring chunks belong to same NUMA node before merging in free_heap_pages(). (the latter being the fix for http://mid.gmane.org/BAY121-W4629FE3344480F9671824CDA850 at phx.gbl which Bastian referred to earlier.) Is there any chance that you could try with the Xen packages from Wheezy and see if this issue has been fixed. Thanks, Ian.

Package: xen-hypervisor-4.0-amd64 Version: 4.0.1-1 Severity: grave Tags: squeeze sid Justification: causes non-serious data loss Live migration of a guest (running CentOS 5.5, Paravirtualized) crashes the target-host (Hardware: Dell R610, 2x Xeon 5620, 16Gb RAM, Perc/700-Raid) (XEN) ----[ Xen-4.0.1 x86_64 debug=n Not tainted ]---- (XEN) CPU: 9 (XEN) RIP: e008:[<ffff82c4801151f6>]