netdev - Re: [PATCH net 1/3] ipv6: Avoid creating RTF_CACHE from a rt that is not managed by fib6 tree

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Message-Id: <20151112220101.47E8B7A080D@apps0.cs.toronto.edu>
Date:	Thu, 12 Nov 2015 17:01:01 -0500
From:	Chris Siebenmann <cks-rhbugzilla@...toronto.edu>
To:	Martin KaFai Lau <kafai@...com>
cc:	netdev <netdev@...r.kernel.org>, Kernel Team <kernel-team@...com>,
	Chris Siebenmann <cks-rhbugzilla@...toronto.edu>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net 1/3] ipv6: Avoid creating RTF_CACHE from a rt that is not managed by fib6 tree

> The original bug report:
> https://bugzilla.redhat.com/show_bug.cgi?id=1272571
> 
> The setup has a IPv4 GRE tunnel running in a IPSec.  The bug
> happens when ndisc starts sending router solicitation at the gre
> interface.  The simplified oops stack is like:
[...]
> Reported-by: Chris Siebenmann <cks-rhbugzilla@...toronto.edu>

 For what it's worth, this change appears to fix my issue in preliminary
testing. I haven't actually brought it up on a production machine with a
GRE tunnel that actually works, but the sequence of operations on my
test machine that used to reliably oops no longer does so.

(I tested this against both a quite recent upstream git pull and the
current Fedora 22 kernel source with this patch blindly shoved in on top
by just running 'patch'.)

	- cks
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