Re: [Xen-devel] broken live migration in xen 4.3 (release)

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Campbell writes ("Re: [Xen-devel] broken live migration in xen 4.3 
(release)"):
> On Mon, 2014-03-17 at 16:28 +0400, Vasiliy Tolstov wrote:
> > Hello all. I'm try to test xen 4.3 release
> 
> Please can you confirm with the latest 4.3.x (which is .2 I think).
> 
> Is this migration between two 4.3 hosts or from a 4.2 host to a 4.3 one?
...
> > migration target: Transfer complete, requesting permission to start domain.
> > migration receiver stream contained unexpected data instead of ready message
> > (command run was: exec ssh ib-xen12 xl migrate-receive )
> 
> Since the stream is encrypted it's hard to debug. Perhaps you could add
> debugging to migrate_read_fixedmessage in xl_cmdimpl.c to print the
> expected and actual messages?

That is a good idea.

If you say
   ssh ib-xen12 echo hi
does it print anything except just "hi" ?

If so then that is the problem.

> My vague guess is that the unexpected data will say something like
> "Segmentation Fault".

That would go to stderr.

> > libxl: error: libxl_utils.c:393:libxl_read_exactly: file/stream
> > truncated reading GO message from migration stream
> > migration target: Failure, destroying our copy.
> > migration child [20864] not exiting, no longer waiting (exit status
> > will be unreported)
> > Migration failed, resuming at sender.
> > 
> > Guest domain kernel panics (timekeeping errors).
> > What can i check? Live migration to localhost also fails.

That the abortive migration breaks the guest is probably a bug in the
guest.

Ian.

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