[Xen-devel] Snapshot fail, when snapshot a vm the second time. (already update to xen-4.0.1 and kernel-2.6.32.25)

[huang.shuangqing@xxxxxxxxxx]

Hello, 

When I snapshot a vm( hvm centos ) the
first time, it succeed. There is a snapshot file on disk and the vm is
 running.  But when I do it the second time, it fail for timeout.

what's wrong with it? 

This error happened when I used xen-4.0.1-rc5
and  kernel-2.6.31.13. Today I update to  xen-4.0.1 and kernel-2.6.32.25,
it is with the same wrong.

Error message: 
[root@localhost ~]# xm save -c 2 snap1
Error: Timeout waiting for domain 2
to suspend
Usage: xm save [-c] <Domain> <CheckpointFile>

Save a domain state to restore later.
  -c, --checkpoint    
          Leave domain running after creating
       
           
                     snapshot

           
                     
xend.log : 
[2010-11-26 15:39:48 5411] DEBUG (XendCheckpoint:124)
[xc_save]: /usr/lib64/xen/bin/xc_save 4 2 0 0 4
[2010-11-26 15:39:48 5411] INFO (XendCheckpoint:423)
xc_save: failed to get the suspend evtchn port
[2010-11-26 15:39:48 5411] INFO (XendCheckpoint:423)
[2010-11-26 15:39:48 5411] DEBUG (XendCheckpoint:394)
suspend
[2010-11-26 15:39:48 5411] DEBUG (XendCheckpoint:127)
In saveInputHandler suspend
[2010-11-26 15:39:48 5411] DEBUG (XendCheckpoint:129)
Suspending 2 ...
[2010-11-26 15:39:48 5411] DEBUG (XendDomainInfo:519)
XendDomainInfo.shutdown(suspend)
[2010-11-26 15:39:48 5411] DEBUG (XendDomainInfo:1891)
XendDomainInfo.handleShutdownWatch
[2010-11-26 15:40:49 5411] DEBUG (XendDomainInfo:1891)
XendDomainInfo.handleShutdownWatch
[2010-11-26 15:40:49 5411] INFO (XendCheckpoint:423)
ERROR Internal error: Suspend request failed
[2010-11-26 15:40:49 5411] INFO (XendCheckpoint:423)
ERROR Internal error: Domain appears not to have suspended
[2010-11-26 15:40:49 5411] INFO (XendCheckpoint:423)
Save exit rc=1
[2010-11-26 15:40:49 5411] ERROR (XendCheckpoint:178)
Save failed on domain ide_CGSL_v3.02 (2) - resuming.
Traceback (most recent call last):
  File "usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line 146, in save
    forkHelper(cmd, fd, saveInputHandler,
False)
  File "usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line 395, in forkHelper
    inputHandler(line, child.tochild)
  File "usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py",
line 131, in saveInputHandler
    dominfo.waitForSuspend()
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 2980, in waitForSuspend
    raise XendError(msg)
XendError: Timeout waiting for domain
2 to suspend
[2010-11-26 15:40:49 5411] DEBUG (XendDomainInfo:3117)
XendDomainInfo.resumeDomain(2)

Thanks a lot.
John
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