Comment 21 for bug 1711407

We're seeing this on our build servers. These are VMWare virtual machines which run docker containers in privileged mode. Inside the containers are Jenkins agents and a build environment. Part of the build process uses unshare to create these namespaces: ipc uts mount pid net. If you have any questions about this arrangement, I can try to provide more detail and maybe example code.

The kernel is 4.4.0-79-generic x86_64. We are using docker 17.05.0-ce.

In one case, the whole VM hung when this was encountered.

Are there any workarounds for 16.04 users beyond rebooting the host?