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

From: Boris Ostrovsky
Date: Mon Jan 30 2017 - 12:07:34 EST

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?