On Fri, May 02, 2014 at 12:22:30PM -0400, Vince Weaver wrote:
> 
> I'll try the patch next.
> 
> Meanwhile, can polling on a closed event cause problems with the reference 
> count?
> 
> In my various failure traces there's always been a poll() active at the 
> time of crash, and I added some trace_printk()s and it looks like poll is 
> at least attempting to poll on the closed file descriptor that's causing 
> us problems.

In principle the vfs file refcounting should be responsible for that.
But I'll go over it in a bit.