netdev - Re: Null pointer dereference in tg3_poll

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Message-ID: <CAO7SqHB5rLKGoVKAifiggDEA1itQNmy7qPVyYht47AYqvNdN6A@mail.gmail.com>
Date:   Tue, 28 Mar 2017 15:12:43 -0700
From:   Salam Noureddine <noureddine@...sta.com>
To:     Michael Chan <michael.chan@...adcom.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        "michael.chan@...adcom.com" <mchan@...adcom.com>,
        "prashant.sreedharan@...adcom.com" <prashant@...adcom.com>,
        Siva Reddy Kallam <siva.kallam@...adcom.com>
Subject: Re: Null pointer dereference in tg3_poll_work running linux-3.4

On Tue, Mar 28, 2017 at 11:53 AM, Michael Chan
<michael.chan@...adcom.com> wrote:

> I don't remember any bug fixes related to this logic.  One possibility
> is that there is DMA corruption and we are getting a bad opaque value.
> If you have the core dump, it will be useful to look at the receive
> completion ring.   These opaque values are simple index values and
> should be in sequence.

Unfortunately I don't have a core dump, this has happened around 5
times on boxes that have been up between 2 and 7 months. So it
seems extremely rare. So far, the only information I have is the
stack trace.