On 08 February 2020 at 07:59 am, Christian Zigotzky wrote:

quoted

On 7. Feb 2020, at 18:08, Arnd Bergmann [off-list ref] wrote:

On Fri, Feb 7, 2020 at 3:34 PM Christian Zigotzky
[off-list ref] wrote:

quoted

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