[Xen-users] VM migration problem: server 1 to server 2 is ok, but does not work if from server 2 to server 1

[Ming Chen <kingming0811@xxxxxxxxx>]

Hello,

I have a problem of migration between two servers. 

Both servers use xen 3.3.1 which is compiled on fc7. I used one single VM. If I create VM on server 1, and migrate it from server 1 to server 2 is OK, and it is also OK to migrate it back to server 1.  However, if I create the VM on server 2 and migrate it to server 1, the VM always disappears. When it fails, the log message on server 1 is as follows:

[2010-01-20 10:39:18 12474] DEBUG (XendCheckpoint:264) [xc_restore]: /usr/lib/xen/bin/xc_restore 34 29 1 2 0 0 0
[2010-01-20 10:39:18 12474] INFO (XendCheckpoint:403) xc_domain_restore start: p2m_size = 10800
[2010-01-20 10:39:18 12474] INFO (XendCheckpoint:403) Reloading memory pages:   0%
[2010-01-20 10:39:44 12474] INFO (XendCheckpoint:403) Received all pages (0 races)
[2010-01-20 10:39:44 12474] INFO (XendCheckpoint:403) ERROR Internal error: Failed to pin batch of 47 page tables
[2010-01-20 10:39:44 12474] INFO (XendCheckpoint:403) Restore exit with rc=1
[2010-01-20 10:39:44 12474] DEBUG (XendDomainInfo:2402) XendDomainInfo.destroy: domid=29
[2010-01-20 10:39:44 12474] ERROR (XendDomainInfo:2416) XendDomainInfo.destroy: domain destruction failed.
Traceback (most recent call last):
  File "//usr/lib/python/xen/xend/XendDomainInfo.py", line 2409, in destroy
    xc.domain_pause(self.domid)
Error: (3, 'No such process')
[2010-01-20 10:39:44 12474] DEBUG (XendDomainInfo:1944) No device model
[2010-01-20 10:39:44 12474] DEBUG (XendDomainInfo:1946) Releasing devices
[2010-01-20 10:39:44 12474] DEBUG (XendDomainInfo:1959) Removing vif/0
[2010-01-20 10:39:44 12474] DEBUG (XendDomainInfo:910) XendDomainInfo.destroyDevice: deviceClass = vif, device = vif/0
[2010-01-20 10:39:45 12474] DEBUG (XendDomainInfo:1959) Removing vbd/51713
[2010-01-20 10:39:45 12474] DEBUG (XendDomainInfo:910) XendDomainInfo.destroyDevice: deviceClass = tap, device = vbd/51713
[2010-01-20 10:39:45 12474] DEBUG (XendDomainInfo:1959) Removing vbd/51714
[2010-01-20 10:39:45 12474] DEBUG (XendDomainInfo:910) XendDomainInfo.destroyDevice: deviceClass = tap, device = vbd/51714
[2010-01-20 10:39:45 12474] DEBUG (XendDomainInfo:1959) Removing console/0
[2010-01-20 10:39:45 12474] DEBUG (XendDomainInfo:910) XendDomainInfo.destroyDevice: deviceClass = console, device = console/0
[2010-01-20 10:39:46 12474] ERROR (XendDomain:1145) Restore failed
Traceback (most recent call last):
  File "//usr/lib/python/xen/xend/XendDomain.py", line 1143, in domain_restore_fd
    return XendCheckpoint.restore(self, fd, paused=paused, relocating=relocating)
  File "//usr/lib/python/xen/xend/XendCheckpoint.py", line 268, in restore
    forkHelper(cmd, fd, handler.handler, True)
  File "//usr/lib/python/xen/xend/XendCheckpoint.py", line 391, in forkHelper
    raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib/xen/bin/xc_restore 34 29 1 2 0 0 0 failed

Could you pls give me some hints to solve this problem? Thanks a lot.
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