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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Fri, 7 Feb 2020 17:08:06 +0000
Message-ID: <CAK8P3a39L5i4aEbKe9CiW6unbioL=T8GqXC007mXxUu+_j84FA@mail.gmail.com>
Subject: Re: Latest Git kernel: avahi-daemon[2410]: ioctl(): Inappropriate
 ioctl for device
To:     Christian Zigotzky <chzigotzky@xenosoft.de>
Cc:     Michael Ellerman <mpe@ellerman.id.au>,
        Jakub Kicinski <kuba@kernel.org>,
        Christophe Leroy <christophe.leroy@c-s.fr>,
        DTML <devicetree@vger.kernel.org>,
        Darren Stevens <darren@stevens-zone.net>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linuxppc-dev@ozlabs.org, "contact@a-eon.com" <contact@a-eon.com>,
        "R.T.Dickinson" <rtd2@xtra.co.nz>, Christoph Hellwig <hch@lst.de>,
        mad skateman <madskateman@gmail.com>,
        "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        Christian Zigotzky <info@xenosoft.de>
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On Fri, Feb 7, 2020 at 3:34 PM Christian Zigotzky
<chzigotzky@xenosoft.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