netdev - Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page Pool

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Date:   Mon, 22 Jul 2019 13:05:38 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>, Lars Persson <lists@...h.nu>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH net-next 3/3] net: stmmac: Introducing support for Page
 Pool


On 22/07/2019 12:39, Jose Abreu wrote:
> From: Lars Persson <lists@...h.nu>
> Date: Jul/22/2019, 12:11:50 (UTC+00:00)
> 
>> On Mon, Jul 22, 2019 at 12:18 PM Ilias Apalodimas
>> <ilias.apalodimas@...aro.org> wrote:
>>>
>>> On Thu, Jul 18, 2019 at 07:48:04AM +0000, Jose Abreu wrote:
>>>> From: Jon Hunter <jonathanh@...dia.com>
>>>> Date: Jul/17/2019, 19:58:53 (UTC+00:00)
>>>>
>>>>> Let me know if you have any thoughts.
>>>>
>>>> Can you try attached patch ?
>>>>
>>>
>>> The log says  someone calls panic() right?
>>> Can we trye and figure were that happens during the stmmac init phase?
>>>
>>
>> The reason for the panic is hidden in this one line of the kernel logs:
>> Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>>
>> The init process is killed by SIGSEGV (signal 11 = 0xb).
>>
>> I would suggest you look for data corruption bugs in the RX path. If
>> the code is fetched from the NFS mount then a corrupt RX buffer can
>> trigger a crash in userspace.
>>
>> /Lars
> 
> 
> Jon, I'm not familiar with ARM. Are the buffer addresses being allocated 
> in a coherent region ? Can you try attached patch which adds full memory 
> barrier before the sync ?

TBH I am not sure about the buffer addresses either. The attached patch
did not help. Same problem persists.

Jon

-- 
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