linux-kernel - Re: Latest Git kernel: avahi-daemon[2410]: ioctl(): Inappropriate ioctl for device

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Date:   Sat, 8 Feb 2020 17:08:40 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Jakub Kicinski <kuba@...nel.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        DTML <devicetree@...r.kernel.org>,
        Darren Stevens <darren@...vens-zone.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...abs.org, "contact@...on.com" <contact@...on.com>,
        "R.T.Dickinson" <rtd2@...a.co.nz>, Christoph Hellwig <hch@....de>,
        mad skateman <madskateman@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Christian Zigotzky <info@...osoft.de>
Subject: Re: Latest Git kernel: avahi-daemon[2410]: ioctl(): Inappropriate
 ioctl for device

On 08 February 2020 at 07:59 am, Christian Zigotzky wrote:
>
>> On 7. Feb 2020, at 18:08, Arnd Bergmann <arnd@...db.de> wrote:
>>
>> On Fri, Feb 7, 2020 at 3:34 PM Christian Zigotzky
>> <chzigotzky@...osoft.de> wrote:
>>> Hello Arnd,
>>>
>>> We regularly compile and test Linux kernels every day during the merge
>>> window. Since Thursday last week we have very high CPU usage because of
>>> the avahi daemon on our desktop Linux systems (Ubuntu, Debian etc). The
>>> avahi daemon produces a lot of the following log message. This generates
>>> high CPU usage.
>>>
>>> Error message: avahi-daemon[2410]: ioctl(): Inappropriate ioctl for device
>>>
>>> strace /usr/sbin/avahi-daemon:
>>>
>> Thanks a lot for the detailed analysis, with this I immediately saw
>> what went wrong in my
>> original commit and I sent you a fix. Please test to ensure that this
>> correctly addresses
>> the problem.
>>
>>         Arnd
> Hi Arnd,
>
> Thanks a lot for your patch! I will test it as soon as possible.
>
> Cheers,
> Christian

Hi Arnd,

I successfully compiled the latest Git kernel with your patch today. The 
avahi daemon works fine now. That means your patch has solved the avahi 
issue.

Thanks for your patch and have a nice weekend!

Cheers,
Christian