Re: 3.14 tc oops

[Daniel Borkmann]

[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@xxxxxxxxx> wrote:
> > On Wed, Apr 2, 2014 at 7:24 AM, Kelly Anderson <kelly@xxxxxxxxx> 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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