[CRIU] failure dumping nginx in docker container

[Ross Boucher]

I'm continuing to work on getting criu support in docker, and someone in
the pull request tried checkpointing an nginx container but was unable to.
I tried and got the same result, here's the log:

https://gist.github.com/boucher/0db7cb44e90f7d3c62bc

The relevant line is:

(00.120390) Error (proc_parse.c:404): Can't handle non-regular mapping on
16462's map 7f41597a7000

Any ideas?

-Ross

Here's the pull request, for the record:
https://github.com/docker/docker/pull/13602
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