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

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Message-ID: <CADnJP=thexf2sWcVVOLWw14rpteEj0RrfDdY8ER90MpbNN4-oA@mail.gmail.com>
Date:   Mon, 22 Jul 2019 13:11:50 +0200
From:   Lars Persson <lists@...h.nu>
To:     Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        Jon Hunter <jonathanh@...dia.com>,
        "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 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