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[Xen-bugs] [Bug 1759] New: Xen 4.0.1 live migration restore over-writes

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Subject: [Xen-bugs] [Bug 1759] New: Xen 4.0.1 live migration restore over-writes new hypervisor's boot-time record (a.k.a. bug 1282 is back)
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Date: Mon, 11 Apr 2011 14:47:41 -0700
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           Summary: Xen 4.0.1 live migration restore over-writes new
                    hypervisor's boot-time record (a.k.a. bug 1282 is back)
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: major
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: bugs@xxxxxxxxxxxxxx

I am having the exact problem described in bug 1282. The RedHat 5 errata for
Xen 3 describes the problem nicely so I will quote it:

xen calculates its running time by adding the hypervisor's up-time to the
hypervisor's boot-time record. In live migrations of para-virtualized
guests, however, the guest would over-write the new hypervisor's boot-time
record with the boot-time of the previous hypervisor. This caused
time-dependent processes on the guests to fail 

This bug was apparently fixed in 3.1.1
(http://xenbits.xen.org/hg/xen-unstable.hg/rev/359707941ae8) but I am having
the issue now with Xen 4.0.1 on Debian Squeeze.

Did something change with the migrate/restore process so the previous fix no
longer applies?

Thanks in advance for any help

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