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[Xen-devel] Snapshot fail, when snapshot a vm the second time. (already

To: xen-users@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Snapshot fail, when snapshot a vm the second time. (already update to xen-4.0.1 and kernel-
From: huang.shuangqing@xxxxxxxxxx
Date: Fri, 26 Nov 2010 15:34:38 +0800
Delivery-date: Thu, 25 Nov 2010 23:49:32 -0800
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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- Today I update to  xen-4.0.1 and kernel-, 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        

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
  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.
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