netdev - Re: 3.14 tc oops

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Date:	Mon, 07 Apr 2014 11:08:47 +0200
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
CC:	Kelly Anderson <kelly@...ka.com>,
	LKML <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: 3.14 tc oops

[Kelly, please also cc netdev]

On 04/07/2014 07:56 AM, Cong Wang wrote:
> On Thu, Apr 3, 2014 at 9:24 AM, Cong Wang <xiyou.wangcong@...il.com> wrote:
>> On Wed, Apr 2, 2014 at 7:24 AM, Kelly Anderson <kelly@...ka.com> wrote:
>>> Hi,
>>>
>>> I hit a kernel oops when starting traffic control on my armv7 router, I don't
>>> think the architecture is related, the same tc code worked perfectly with
>>> earlier kernel versions, i.e. 3.13.x.
>>>
>>> I also attached an object dump with line numbers to make identifying the
>>> problem a bit easier.
>>>
>>> Please cc me to keep me in the loop, I can test patches.
>>
>>
>> Thanks for the report! Looks like it is caused by one of my patches,
>> I will look into this shortly.
>>
>
> Which tc filter are you using on that htb qdisc? (tc filter show dev ....)
>
> I suspect it's tcindex filter, if so please try the following patch:
>
> diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
> index eed8404..14618cc 100644
> --- a/net/sched/cls_tcindex.c
> +++ b/net/sched/cls_tcindex.c
> @@ -298,8 +298,10 @@ tcindex_set_parms(struct net *net, struct
> tcf_proto *tp, unsigned long base,
>          tcf_exts_change(tp, &cr.exts, &e);
>
>          tcf_tree_lock(tp);
> -       if (old_r && old_r != r)
> +       if (old_r && old_r != r) {
>                  memset(old_r, 0, sizeof(*old_r));
> +               tcf_exts_init(&old_r->exts, TCA_TCINDEX_ACT,
> TCA_TCINDEX_POLICE);
> +       }
>
>          memcpy(p, &cp, sizeof(cp));
>          memcpy(r, &cr, sizeof(cr));
> --
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