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

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Date:   Fri, 7 Feb 2020 17:08:06 +0000
From:   Arnd Bergmann <arnd@...db.de>
To:     Christian Zigotzky <chzigotzky@...osoft.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 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