netdev - Re: Fw: [Bug 84991] New: Adding a gre tunnel causes a kernel panic

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Date:	Mon, 22 Sep 2014 10:09:27 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <stephen@...workplumber.org>
Cc:	netdev@...r.kernel.org
Subject: Re: Fw: [Bug 84991] New: Adding a gre tunnel causes a kernel panic

On Mon, 2014-09-22 at 09:02 -0700, Stephen Hemminger wrote:
> Not good, and user did bisection.
> 
> using git bisect, the below commit introduced the above bug.
> 
> [7d442fab0a6777fd7612cfcada32ea859553d370] ipv4: Cache dst in tunnels
> 
> 
> commit 7d442fab0a6777fd7612cfcada32ea859553d370
> Author: Tom Herbert <therbert@...gle.com>
> Date:   Thu Jan 2 11:48:26 2014 -0800
> 
>     ipv4: Cache dst in tunnels
> 
>     Avoid doing a route lookup on every packet being tunneled.
> 
>     In ip_tunnel.c cache the route returned from ip_route_output if
>     the tunnel is "connected" so that all the rouitng parameters are
>     taken from tunnel parms for a packet. Specifically, not NBMA tunnel
>     and tos is from tunnel parms (not inner packet).
> 
>     Signed-off-by: Tom Herbert <therbert@...gle.com>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> 
> Begin forwarded message:
> 
> Date: Sun, 21 Sep 2014 16:56:08 -0700
> From: "bugzilla-daemon@...zilla.kernel.org" <bugzilla-daemon@...zilla.kernel.org>
> To: "stephen@...workplumber.org" <stephen@...workplumber.org>
> Subject: [Bug 84991] New: Adding a gre tunnel causes a kernel panic
> 
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=84991
> 
>             Bug ID: 84991
>            Summary: Adding a gre tunnel causes a kernel panic
>            Product: Networking
>            Version: 2.5
>     Kernel Version: 3.17.0-rc5 #82 SMP PREEMPT
>           Hardware: x86-64
>                 OS: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: high
>           Priority: P1
>          Component: IPV4
>           Assignee: shemminger@...ux-foundation.org
>           Reporter: joe9mail@...il.com
>         Regression: No

Thanks, I'll send a fix.


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