[CRIU] combining pre-copy and post-copy doesn't work anymore

[Andrei Vagin]

On Mon, Jan 16, 2017 at 06:37:21PM +0100, Adrian Reber wrote:
> Hello Mike,
> 
> I just tried lazy migration in combination with pre-dumping. In my tests
> it fails and I wanted to ask if you tested it recently?

As soon as you fix this, I recommend to add a test in
scripts/travis/travis-tests to avoid this sort of surprises in a
future;). Everything what is not covered by tests is already broken
or will be broken soon.

> 
> (46.566404) polling timeout
> (46.566415) lazy-pages: Start handling remaining pages
> (46.566417) pr2 Read b0e000 1 pages
> (46.580431) lazy-pages: 1119: uffd_copy: 0xb0e000/4096
> (46.580447) Error (criu/uffd.c:529): lazy-pages: 1119: UFFDIO_COPY failed: rc:-1 copy:-17
> (46.580452) polling timeout
> (46.580454) pr2 Read dba000 1 pages
> 
> Or is this works as designed as the page is already in the parent
> image? The error message just sounds a bit scary.
> 
> The restore does not work, so something seems wrong. The lazy-pages
> daemon ends with 0 and:
> 
> lazy-pages: Process 1119: with UFFD transferred pages: (1777/1777)
> 
> 		Adrian
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