netdev - Re: [PATCH] Revert "net: do not allow changing SO_REUSEADDR/SO

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Date:   Tue, 12 Jun 2018 10:13:16 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Bart Van Assche <bart.vanassche@....com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org,
        Maciej Żenczykowski <maze@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH] Revert "net: do not allow changing
 SO_REUSEADDR/SO_REUSEPORT on bound sockets"



On 06/12/2018 10:05 AM, Bart Van Assche wrote:
> Revert the patch mentioned in the subject because it breaks at least
> the Avahi mDNS daemon. That patch namely causes the Ubuntu 18.04 Avahi
> daemon to fail to start:
> 
> Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: Successfully called chroot().
> Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: Successfully dropped remaining capabilities.
> Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: No service file found in /etc/avahi/services.
> Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: SO_REUSEADDR failed: Structure needs cleaning
> Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: SO_REUSEADDR failed: Structure needs cleaning
> Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: Failed to create server: No suitable network protocol available
> Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: avahi-daemon 0.7 exiting.
> Jun 12 09:49:24 ubuntu-vm systemd[1]: avahi-daemon.service: Main process exited, code=exited, status=255/n/a
> Jun 12 09:49:24 ubuntu-vm systemd[1]: avahi-daemon.service: Failed with result 'exit-code'.
> Jun 12 09:49:24 ubuntu-vm systemd[1]: Failed to start Avahi mDNS/DNS-SD Stack.
> 
> Fixes: f396922d862a ("net: do not allow changing SO_REUSEADDR/SO_REUSEPORT on bound sockets")
> Cc: Maciej Żenczykowski <maze@...gle.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Bart Van Assche <bart.vanassche@....com>
> ---
>  net/core/sock.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)

Yes, this change probably broke a lot of applications, unfortunately.

Acked-by: Eric Dumazet <edumazet@...gle.com>