linux-kernel - Re: [PATCH 4.19 01/24] bridge: do not add port to router list when receives query with source 0.0.0.0

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Message-ID: <e9423963-c847-0406-4158-1b6f470e8b61@cumulusnetworks.com>
Date:   Wed, 20 Feb 2019 15:11:28 +0200
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Sebastian Gottschall <s.gottschall@...media-net.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Ying Xu <yinxu@...hat.com>, Hangbin Liu <liuhangbin@...il.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linus Lüssing <linus.luessing@...3.blue>
Subject: Re: [PATCH 4.19 01/24] bridge: do not add port to router list when
 receives query with source 0.0.0.0

On 20/02/2019 15:09, Nikolay Aleksandrov wrote:
> On 20/02/2019 14:48, Sebastian Gottschall wrote:
>> *reminder*
>>
> [snip]
>>>>>>    }
>>>>>>    static void br_ip4_multicast_query(struct net_bridge *br,
>>>> Is this also a problem in 4.20?  This patch went into 4.20-rc1, so it
>>>> has been around for a while with no reported issues that I can find.
>>>> Any pointers to the reports?
>>>
>>> i need to check this. i found this patch in 4.9, 4.14 and 4.4
>>> the rest was picked up from the mailinglist. according to the git sources of 4.20 and 5.0 the same code is in there as well
>>>
>>> i just got the report from users today and was able to reproduce it with iptv streams. just by disabling the code it was working again.
>>>
>>> Sebastian
>>>>
>>>> thanks,
>>>>
>>>> greg k-h
>>>>
>>>
> 
> Could you please include more details about the setup that's broken ?
> Note that we were warned[1] of potential breakage from this change
> after it went in and regardless of the suggestion from the RFC we'll
> probably have to revert this patch.
> 
> Ying Xu as author of the patch, any thoughts ?
> 

My bad, it's Hangbin Liu's patch. It was reported by Ying Xu.

> Also adding Linus Lüssing to the CC as he was the one who warned against it.
> Note that the warning was sent as a reply to my breakage fix, but it was intended
> for the original patch.
> 
> Thanks,
>  Nik
> 
> [1] https://www.mail-archive.com/netdev@vger.kernel.org/msg272944.html
>