processes stuck in vmo_de state

[Robert Watson]

On Tue, 11 Mar 2014, Xin Li wrote:

> I have recently upgraded my home storage box (Avoton based board running 
> FreeBSD/amd64) from 10.0-RELEASE (patched with some ZFS changes) to 
> -CURRENT.  It looks like the system would easily hang when I start 
> 'buildworld', when this happens, I saw sh process stuck in 'vmo_de' state 
> and procstat -kk would give me EBUSY:

I recently updated my 11-CURRENT development VM and am encountering the same 
problem while doing buildworld.

Robert