Subject: Re: [ppdev] sysfs warning on qemu boot
To: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
References: <0039c5ca-0a77-968c-7356-07977242474b@redhat.com>
 <58235726.6000903@codethink.co.uk>
 <0d71c0da-d888-85b0-2e77-ad5064c5e0bb@redhat.com> <5826349F.80408@gmail.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        gregkh@linuxfoundation.org
From: Joe Lawrence <joe.lawrence@redhat.com>
Organization: Red Hat
Message-ID: <80647f01-bf8e-56c6-4933-c161bbce3fc6@redhat.com>
Date: Fri, 11 Nov 2016 17:16:08 -0500
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On 11/11/2016 04:14 PM, Sudip Mukherjee wrote:
> Hi Joe,
> 
> On Wednesday 09 November 2016 06:41 PM, Joe Lawrence wrote:
>> On 11/09/2016 12:04 PM, Sudip Mukherjee wrote:
>>> Hi Joe,
>>>
>>> On 09/11/16 16:00, Joe Lawrence wrote:
>>>> Hi Sudip,
>>>>
>>>> I hit a sysfs_warn_dup inside QEMU running 4.9.0-rc4 (I suspect earlier
>>>> versions as well, but this is the first upstream I've run in a while).
>>>> This warning looks like something the kernel test robot ran into a few
>>>> months ago:
>>>
>>> Yes, 0day reported, but I was unable to reproduce it with the config
>>> file that was given. Can you please send me your .config file and I will
>>> try to reproduce this on my setup, and if I am not able to then i will
>>> have to disturb you for debugging and testing.
> 
> Can you please test the attached patch and try to reproduce the error...
> Sorry I could not test it as i could not build using your .config, I
> guess its time for me to upgrade gcc.

FWIW, my versino of gcc:

  gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-4)

I gave the patch a quick test and it loaded without any warnings on
boot. I also gave it a few rmmod / modprobe cycles and didn't see any
further warnings.

Thanks!

Tested-by: Joe Lawrence <joe.lawrence@redhat.com>

-- Joe