netdev - Re: [PATCH] ipv4: fix a race in ip4_datagram_release

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Message-ID: <1402448128.3645.437.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 10 Jun 2014 17:55:28 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	dormando <dormando@...ia.net>
Cc:	Alexey Preobrazhensky <preobr@...gle.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	David Miller <davem@...emloft.net>, paulmck@...ux.vnet.ibm.com,
	netdev@...r.kernel.org, Kostya Serebryany <kcc@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Lars Bull <larsbull@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Bruce Curtis <brutus@...gle.com>,
	Maciej Żenczykowski <maze@...gle.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [PATCH] ipv4: fix a race in ip4_datagram_release_cb()

On Tue, 2014-06-10 at 17:32 -0700, dormando wrote:

> >
> 
> This is neat. So just confirming that I understand (thanks for re-cc'ing
> me btw <3):
> 
> Because of the UDP glitch, it can cause either the kernel panic in the UDP
> code, but also elsewhere in the TCP stack based on if it's fiddling with
> the same DST being hosed by a UDP packet?
> 
> Unfortunately we're observing a pretty severe sintr cpu increase under
> 3.14, so I'm going to try this on 3.10.latest. Any potential issues there?
> 
> Thankfully it seems like our udpkill utility will reproduce it quickly.
> Lets see how it goes!

This is a start, because we have other bugs of the same kind.

I was working on follow up



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