Rancher Server 1.2.1 produces plenty amount of log messages

Hey there!

I use Rancher Server 1.2.1 running on Docker 1.12.3 and have found that it produces plenty amount of log messages to stdout/stderr. Almost all of them look like this:

2016-12-18 21:16:53,987 ERROR [6737f80e-579b-4496-9371-b52eb62cc7ba:217067] [volumeStoragePoolMap:2142] [volumestoragepoolmap.remove] [] [cutorService-15] [c.p.e.p.i.DefaultProcessInstanceImpl] Agent error for [storage.volume.remove.reply;agent=2338]: Error response from daemon: Unable to remove filesystem for 21dd818d886b05616dfe421f4b58cd6da23e7c878ee21248816eac6fa2771744: remove /var/lib/docker/containers/21dd818d886b05616dfe421f4b58cd6da23e7c878ee21248816eac6fa2771744/shm: device or resource busy

So my questions are:

  1. Is it something critical and I should check and fix Rancher/Docker configuration? What could be wrong with my setup in this case?
  2. If that isn’t critical how can suppress it?

Thank you!