hi,

> > This means that I/O on the vnd block device expect to be called from
> > a process context, while the xbd backend calls it from interrupt  
> > context.
> > And obvious way to fix this would be to add a kernel thread to the  
> > xbd backend
> > to do this. But maybe this needs a closer look:
> 
> This is really a known problem.  The vnd driver needs to be rewritten  
> badly.  It needs to queue up requests and defer everything to a  
> kthread that actually does the work.
> 
> -- thorpej

do you really think VOP_STRATEGY should be usable from interrupt context?

YAMAMOTO Takashi