netdev - Re: 2.6.34: Problem with UDP traffic on lo + poll(?)

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Message-ID: <1283895544.2634.256.camel@edumazet-laptop>
Date:	Tue, 07 Sep 2010 23:39:04 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Krzysztof Olędzki <ole@....pl>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: 2.6.34: Problem with UDP traffic on lo + poll(?)

Le mardi 07 septembre 2010 à 23:28 +0200, Krzysztof Olędzki a écrit :

> With the above patch I'm no longer able to reproduce the problem. Thanks!
> 
> Tested-by: Krzysztof Piotr Oledzki <ole@....pl>
> 

Thanks a lot !

> BTW: why it takes so long to trigger this bug and it is only possible 
> over a loopback interface?

Its a bit tricky : You need at least 10 sockets linked in a particular
hash chain.

To check this, you can :

cat /proc/net/udp

maybe you have many sockets on port 123 or 53 ?

And about loopback, I have no idea... I am pretty sure I can trigger the
bug with other interfaces.



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