[PATCH v2 1/2] nvme: switch to RCU freeing the namespace

[Keith Busch]

On Tue, May 17, 2016 at 02:09:34PM -0700, Ming Lin wrote:
> On Tue, May 17, 2016 at 2:07 PM, Keith Busch <keith.busch at intel.com> wrote:
> > Great, thanks. I was getting good results with this as well.
> 
> Thanks for the fix. Could you send the patch formally?

Will do. Sending shortly.

> > Bummer. Is your controller using sparse namespaces? The kernel message
> > before the bug appears to indicate that.
> 
> No. Only 1 namespace.

Something must be corrupt then. The below line shows an unallocated
namespace is failing to identify itself, but if you only report 1 ns,
we shouldn't have been able to get here from a simple nvme reset.

I think your resets are occuring faster than we anticipated and you've
uncovered another bug. It looks like these may cause trouble if reset
occurs during active scan work.

> >> [   44.985454] block (null): nvme_revalidate_disk: Identify failure