Re: [patch, v3] add an aio test which closes the fd before destroying the ioctx

[Dave Chinner <david@fromorbit.com>]

On Wed, Aug 20, 2014 at 07:43:19PM -0400, Jeff Moyer wrote:
> Hi, Dave,
> 
> Dave Chinner <david@fromorbit.com> writes:
> 
> > IOWs, we now have two AIO+DIO tests showing the same symptoms that
> > no other tests show. This tends to point at AIO not being fully
> > cleaned up and completely freed by the time the processes
> > dispatching it have exit()d. This failure generally occurs when
> > there is other load on the system/disks backing the test VM (e.g.
> > running xfstests in multiple VMs at the same time) so I suspect it
> > has to do with IO completion taking a long time.
> 
> Process exit waits for all outstanding I/O, but maybe it's an rcu thing.

Hmmm - __fput()?

> > Can you spend some time trying to reproduce this and getting to the
> > bottom of whatever is triggering the unmount error?
> 
> I can take a look, but not until next week.  Hopefully that's ok?

Yeah, that's fine. I don't have the bandwidth to look at it either
right now, so I'll just expunge the test for the meantime.

Thanks, Jeff!

-Dave.
-- 
Dave Chinner
david@fromorbit.com