(In reply to Christian König from comment #5)
> (In reply to Mike Lothian from comment #4)
> > When this happens my machine just freezes, the only way to continue is to
> > press and hold the power button but that doesn't cleanly unmount the disks
> 
> Yeah, that is clearly a bug when the driver unloads.
> 
> Probably rather hard to reproduce, we should add a test case which loads and
> unloads the driver multiple times while there is load.

Maybe we shall avoid to use fence for vmid, instead using LRU list.