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Subject: Re: Latest Git kernel: avahi-daemon[2410]: ioctl(): Inappropriate
 ioctl for device
To:     Michael Ellerman <mpe@ellerman.id.au>,
        Jakub Kicinski <kuba@kernel.org>
Cc:     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>
References: <20200203095325.24c3ab1c@cakuba.hsd1.ca.comcast.net>
 <C11859E1-BE71-494F-81E2-9B27E27E60EE@xenosoft.de>
 <87tv441gg1.fsf@mpe.ellerman.id.au>
From:   Christian Zigotzky <chzigotzky@xenosoft.de>
Message-ID: <f438e4ed-7746-1d80-6d72-455281884a1e@xenosoft.de>
Date:   Thu, 6 Feb 2020 15:28:20 +0100
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On 06 February 2020 at 05:35 am, Michael Ellerman wrote:
> Christian Zigotzky <chzigotzky@xenosoft.de> writes:
>> Kernel 5.5 PowerPC is also affected.
> I don't know what you mean by that. What sha are you talking about?
>
> I have a system with avahi running and everything's fine.
>
>    # grep use- /etc/avahi/avahi-daemon.conf
>    use-ipv4=yes
>    use-ipv6=yes
>    
>    # systemctl status -l --no-pager avahi-daemon
>    ● avahi-daemon.service - Avahi mDNS/DNS-SD Stack
>       Loaded: loaded (/lib/systemd/system/avahi-daemon.service; enabled; vendor preset: enabled)
>       Active: active (running) since Thu 2020-02-06 14:55:34 AEDT; 38min ago
>     Main PID: 1884 (avahi-daemon)
>       Status: "avahi-daemon 0.7 starting up."
>       CGroup: /system.slice/avahi-daemon.service
>               ├─1884 avahi-daemon: running [mpe-ubuntu-le.local]
>               └─1888 avahi-daemon: chroot helper
>    
>    Feb 06 14:55:34 mpe-ubuntu-le avahi-daemon[1884]: Registering new address record for fe80::5054:ff:fe66:2a19 on eth0.*.
>    Feb 06 14:55:34 mpe-ubuntu-le avahi-daemon[1884]: Registering new address record for 10.61.141.81 on eth0.IPv4.
>    Feb 06 14:55:34 mpe-ubuntu-le avahi-daemon[1884]: Registering new address record for ::1 on lo.*.
>    Feb 06 14:55:34 mpe-ubuntu-le avahi-daemon[1884]: Registering new address record for 127.0.0.1 on lo.IPv4.
>    Feb 06 14:55:34 mpe-ubuntu-le systemd[1]: Started Avahi mDNS/DNS-SD Stack.
>    Feb 06 14:55:35 mpe-ubuntu-le avahi-daemon[1884]: Server startup complete. Host name is mpe-ubuntu-le.local. Local service cookie is 3972418141.
>    Feb 06 14:55:38 mpe-ubuntu-le avahi-daemon[1884]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::5054:ff:fe66:2a19.
>    Feb 06 14:55:38 mpe-ubuntu-le avahi-daemon[1884]: Joining mDNS multicast group on interface eth0.IPv6 with address fd69:d75f:b8b5:61:5054:ff:fe66:2a19.
>    Feb 06 14:55:38 mpe-ubuntu-le avahi-daemon[1884]: Registering new address record for fd69:d75f:b8b5:61:5054:ff:fe66:2a19 on eth0.*.
>    Feb 06 14:55:38 mpe-ubuntu-le avahi-daemon[1884]: Withdrawing address record for fe80::5054:ff:fe66:2a19 on eth0.
>    
>    # uname -r
>    5.5.0-gcc-8.2.0
>
>
> The key question is what ioctl is it complaining about. You should be
> able to find that via strace.
>
> cheers
>
Hello Michael,

Sorry it isn't true that the kernel 5.5 is also affected. A Power Mac G5 
user told me that but this isn't correct. I compiled and tested the 
stable kernel 5.5.1 and 5.5.2 today and both kernels don't have the 
issue with the avahi daemon.
Could you please also test the latest Git kernel?

strace /usr/sbin/avahi-daemon

...
poll([{fd=4, events=POLLIN}, {fd=16, events=POLLIN}, {fd=15, 
events=POLLIN}, {fd=14, events=POLLIN}, {fd=13, events=POLLIN}, {fd=12, 
events=POLLIN}, {fd=11, events=POLLIN}, {fd=10, events=POLLIN}, {fd=9, 
events=POLLIN}, {fd=8, events=POLLIN}, {fd=6, events=POLLIN}], 11, 65) = 
2 ([{fd=12, revents=POLLIN}, {fd=9, revents=POLLIN}])
ioctl(12, FIONREAD, 0xffba6f24)         = -1 ENOTTY (Inappropriate ioctl 
for device)
write(2, "ioctl(): Inappropriate ioctl for"..., 39ioctl(): Inappropriate 
ioctl for device) = 39
write(2, "\n", 1
)                       = 1
...

Thanks,
Christian