linux-kernel - Re: [3.1] Divide by zero in __tcp_select

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Message-ID: <20111114204438.GC11668@hostway.ca>
Date:	Mon, 14 Nov 2011 12:44:38 -0800
From:	Simon Kirby <sim@...tway.ca>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, tglx@...utronix.de, netdev@...r.kernel.org,
	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	davej@...hat.com, schwidefsky@...ibm.com, mingo@...e.hu
Subject: Re: [3.1] Divide by zero in __tcp_select_window()

On Mon, Nov 14, 2011 at 03:36:08PM -0500, David Miller wrote:

> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Tue, 08 Nov 2011 22:23:25 +0100
> 
> > OK, it seems we let a timer running while we free the socket (same error
> > path than your previous bug report, because of the NULL route)
> > 
> > We arm this keepalive timer in tcp_create_openreq_child()
> > 
> > net/ipv4/tcp_minisocks.c:513
> > 	if (sock_flag(newsk, SOCK_KEEPOPEN))
> > 		inet_csk_reset_keepalive_timer(newsk,
> > 			keepalive_time_when(newtp));
> > 
> > I would try to add a call to tcp_clear_xmit_timers() as well
> > 
> > Please try following patch :
> 
> We've been waiting quite some time to get some testing validation on
> this patch, but I think it's correct.
> 
> Eric can you formally submit this?  Thanks!

Sorry, I'm still testing slowly, with the "crash into the new kernel"
method. :) I'll reboot the rest shortly, but so far no recurrences on
boxes running with this fix, and no other problems noted with it applied.

Simon-
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