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From: Matt Turner <mattst88@gmail.com>
Date: Sat, 9 Dec 2017 13:03:42 -0800
Message-ID: <CAEdQ38H+jUF3OXpe13Vfm=QZE3iHa=B7PpXkpbek1PnY2E1u5w@mail.gmail.com>
Subject: Re: NFS corruption, fixed by echo 1 > /proc/sys/vm/drop_caches --
 next debugging steps?
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>,
        "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>,
        linux-nfs@vger.kernel.org, Paolo Abeni <pabeni@redhat.com>,
        Hannes Frederic Sowa <hannes@stressinduktion.org>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@kernel.org>,
        Manuel Lauss <manuel.lauss@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>,
        netdev <netdev@vger.kernel.org>
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Sender: linux-nfs-owner@vger.kernel.org

On Fri, Dec 8, 2017 at 1:16 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> On Fri, 2017-12-08 at 12:26 -0800, Matt Turner wrote:
>>
>> Thanks for the quick reply!
>>
>> I tried the patch on top of master, but unfortunately the corruption
>> still occurs.
>
> You might try replacing in sbdma_add_rcvbuffer()
>
> sb_new = netdev_alloc_skb(dev, size);
>
> by
>
> sb_new = alloc_skb(size, GFP_ATOMIC);
>
> Maybe the device does not like having a frame spanning 2 pages.

No such luck. I also gave changing the page size from 16K to 4K a shot
without success.