netdev - Re: [BUG] Kernel recieves DNS reply, but doesn't deliver it to a waiting application

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Message-ID: <1359991267.30177.143.camel@edumazet-glaptop>
Date:	Mon, 04 Feb 2013 07:21:07 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andrew Savchenko <bircoph@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [BUG] Kernel recieves DNS reply, but doesn't deliver it to a
 waiting application

On Mon, 2013-02-04 at 17:39 +0400, Andrew Savchenko wrote:

> With 16-days uptime system works fine.
> 
> Also I was able to reproduce this bug on another box: an embedded
> system running openwrt with 3.7.5 kernel with openl2tpd client and
> dnsmasq server. Due to limited memory resources this bug happened to
> be easily reproducible: several thousands of dns queries were
> sufficient to reproduce this bug. Full debug on embedded box was not
> possible due to constrained resources, but bug appearance was the same
> and /proc/net/udp is apparently broken (see attached log).
> 
> I applied your patch on openwrt's 3.7.5 kernel and it fixed the bug
> on this box too.
> 
> So we've found a solution and I'm looking forward for it in the main
> kernel :)

Thanks a lot for testing, I'll send the official patch asap.


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