[Xen-bugs] [Bug 947] New: [LM] live migrate 2 guests between to machines in the opposite direction at the same time will lead to one guest restore quite slowly or even fail to restore

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=947

           Summary: [LM] live migrate 2 guests between to machines in the
                    opposite direction at the same time will lead to one
                    guest restore quite slowly or even fail to restore
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: fan.zhao@xxxxxxxxx


Environment:
------------
Service OS (ia32/ia32e/IA64): ia32pae
Guest OS (ia32/ia32e/IA64): ia32/ia32pae
Change Set: 14687


Bug detailed description:
--------------------------
I have two physical machines A and B, each with a guest running on it. Then I
migrate the guest 
running on machine A to machine B, and migrate the guest on machine B to
machine A at nearly the 
same time. Then the guest which is migrated from machine B to A need quite a
long time(unaccepted, 
several mins) to restore on machine A successfully. The qemu window will not
pop up for a long 
time, or even not pop up at all. Its status show as paused before the qemu
window pop up. 


Reproduce steps:
----------------
1) xm create a guest on machine A
2) xm create a guest on machine B
3) xm migrate the guest on machine A to machine B
4) xm migrate the guest on machine B to machine A
Conduct 3) and 4) at nearly the same time


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