netdev - Re: [lkp] [net] af1fee9821: BUG:spinlock_trylock_failure_on_UP_on

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Message-ID: <20161107095532.GD16599@microsemi.com>
Date:   Mon, 7 Nov 2016 10:55:32 +0100
From:   "Allan W. Nielsen" <allan.nielsen@...rosemi.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     kernel test robot <xiaolong.ye@...el.com>,
        Raju Lakkaraju <Raju.Lakkaraju@...rosemi.com>,
        "David S. Miller" <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <lkp@...org>
Subject: Re: [lkp] [net]  af1fee9821:
 BUG:spinlock_trylock_failure_on_UP_on_CPU

Hi,

I'm quite surprised too.

I asked Raju to see if he can re-produce, and then try again with the
microsemi_phy disabled and see it that makes a difference.

If Raju gets stuck on this, then I will try to help our during the after-noon.

/Allan

On 07/11/16 10:31, Andrew Lunn wrote:
> EXTERNAL EMAIL
> 
> 
> On Mon, Nov 07, 2016 at 10:26:28AM +0800, kernel test robot wrote:
> >
> > FYI, we noticed the following commit:
> >
> > https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
> > commit af1fee98219992ba2c12441a447719652ed7e983 ("net: phy: Add support for Microsemi VSC 8530/40 Fast Ethernet PHY")
> 
> Humm, interesting. I've no idea how this patch can trigger such a
> warning. The USB gadget does not have an Ethernet PHY, let alone a
> Microsemi 8530/40 Fast Ethernet PHY this patch adds.
> 
> However, it seems nicely documented how to reproduce this. Allan, can
> you setup such a system? Reproduce it, then revert the change and see
> if it still happens.
> 
>    Andrew