Re: [Xen-devel] [PATCH v2] xen-netfront: Fix Rx stall during network stress and OOM

[Vineeth Remanan Pillai <vineethp@xxxxxxxxxx>]

On 01/30/2017 09:06 AM, Boris Ostrovsky wrote:
> On 01/30/2017 11:47 AM, Vineeth Remanan Pillai wrote:
>
> > > 2. It tickles a latent bug during resume where the timer triggers
> > > before we re-connect. The trouble is that we now try to dereference
> > > queue->rx.sring which is NULL since we disconnect in
> > > netfront_resume(). (Curiously, I only observe it with 32-bit guests)
> > I think we may hit this bug after removing the timer as well. We call
> > RING_PUSH_REQUESTS_AND_CHECK_NOTIFY soon after, which also dereference
> > queue->rx.sring.
> If the timer is deleted in xennet_disconnect_backend() then why would
> anyone be pushing anything to the backend after that?
Sorry, I got the ordering wrong. Thanks for the clarification..

Thanks,
Vineeth



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