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

From Vineeth Remanan Pillai <vineethp@amazon.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and OOM
Date 2017-01-30 18:20 +0100
Message-ID <t5nMu-6G1-33@gated-at.bofh.it> (permalink)
References <t1nUK-3Tq-13@gated-at.bofh.it> <t1nUK-3Tq-11@gated-at.bofh.it> <t56Vj-4UH-7@gated-at.bofh.it> <t5nt8-6kA-13@gated-at.bofh.it> <t5nCN-6CL-3@gated-at.bofh.it>
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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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[PATCH v2] xen-netfront: Fix Rx stall during network stress and OOM Vineeth Remanan Pillai <vineethp@amazon.com> - 2017-01-19 17:40 +0100
  Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress  and OOM David Miller <davem@davemloft.net> - 2017-01-19 18:20 +0100
    Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress  and OOM David Miller <davem@davemloft.net> - 2017-01-19 19:20 +0100
    Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and  OOM Vineeth Remanan Pillai <vineethp@amazon.com> - 2017-01-19 19:30 +0100
  Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress  and OOM David Miller <davem@davemloft.net> - 2017-01-20 20:10 +0100
  Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and  OOM Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-01-30 00:20 +0100
    Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and  OOM Vineeth Remanan Pillai <vineethp@amazon.com> - 2017-01-30 18:00 +0100
      Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and  OOM Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2017-01-30 18:10 +0100
        Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and  OOM Vineeth Remanan Pillai <vineethp@amazon.com> - 2017-01-30 18:20 +0100
      Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and  OOM Vineeth Remanan Pillai <vineethp@amazon.com> - 2017-01-31 18:00 +0100

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