Re: [Xen-devel] Internal error during live migration saving

[Nathan March <nathan@xxxxxx>]

On 9/14/2011 10:53 AM, Shriram Rajagopalan wrote:
> On Tue, Sep 13, 2011 at 2:01 PM, Nathan March<nathan@xxxxxx>  wrote:
> > Just wondering if this is a known bug?
> >
> > Trying to migrate the VM off to a diff dom0 results in the below error.
> > Other VMs migrated off fine (started at around the same time as this vm) and
> > I've tried a few different target servers, all resulting in the same thing.
> Were other domains linux 3.0.3 as well ?
All the dom0's are 3.0.3 and all the domU's are 2.6.32.27 (w/ grsec).

I did a cold reboot of the VM and now it migrates properly.

> > [2011-09-13 13:48:24 3996] DEBUG (XendCheckpoint:124) [xc_save]:
> > /usr/lib/xen/bin/xc_save 29 77 0 0 1
> > [2011-09-13 13:48:24 3996] INFO (XendCheckpoint:423) xc_save: failed to get
> > the suspend evtchn port
> > [2011-09-13 13:48:24 3996] INFO (XendCheckpoint:423)
> > [2011-09-13 13:49:03 3996] DEBUG (XendCheckpoint:394) suspend
> > [2011-09-13 13:49:03 3996] DEBUG (XendCheckpoint:127) In saveInputHandler
> > suspend
> > [2011-09-13 13:49:03 3996] DEBUG (XendCheckpoint:129) Suspending 77 ...
> > [2011-09-13 13:49:03 3996] DEBUG (XendDomainInfo:524)
> > XendDomainInfo.shutdown(suspend)
> > [2011-09-13 13:49:03 3996] DEBUG (XendDomainInfo:1881)
> > XendDomainInfo.handleShutdownWatch
> > [2011-09-13 13:50:06 3996] DEBUG (XendDomainInfo:1881)
> > XendDomainInfo.handleShutdownWatch
> > [2011-09-13 13:50:06 3996] INFO (XendCheckpoint:423) xc: error: Suspend
> > request failed: Internal error
> > [2011-09-13 13:50:06 3996] INFO (XendCheckpoint:423) xc: error: Domain
> > appears not to have suspended: Internal error
> > [2011-09-13 13:50:06 3996] ERROR (XendCheckpoint:185) Save failed on domain
> > globish (77) - resuming.
> > Traceback (most recent call last):
> >   File "/usr/lib64/python2.6/site-packages/xen/xend/XendCheckpoint.py", line
> > 146, in save
> >     forkHelper(cmd, fd, saveInputHandler, False)
> >   File "/usr/lib64/python2.6/site-packages/xen/xend/XendCheckpoint.py", line
> > 395, in forkHelper
> >     inputHandler(line, child.tochild)
> >   File "/usr/lib64/python2.6/site-packages/xen/xend/XendCheckpoint.py", line
> > 131, in saveInputHandler
> >     dominfo.waitForSuspend()
> >   File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line
> > 2998, in waitForSuspend
> >     raise XendError(msg)
> > XendError: Timeout waiting for domain 77 to suspend
> > [2011-09-13 13:50:06 3996] DEBUG (XendDomainInfo:3135)
> > XendDomainInfo.resumeDomain(77)
> >
> > xend-debug.log and the target dom0 logs don't show anything of value.
> >
> > This is xen 4.1.1 on linux 3.0.3
> Did you try xm save -c (or the xl equivalent) ? This should be
> activating the same
> code path where this error seems to appear.
>
> Also, make sure you have CONFIG_XEN_SAVE_RESTORE enabled.
Unfortunately I didn't think to try it. I do have that set on both dom0 
and domu.
- Nathan

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