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Date:	Sun, 6 Apr 2014 22:56:27 -0700
From:	Cong Wang <>
To:	Kelly Anderson <>
Cc:	LKML <>
Subject: Re: 3.14 tc oops

On Thu, Apr 3, 2014 at 9:24 AM, Cong Wang <> wrote:
> On Wed, Apr 2, 2014 at 7:24 AM, Kelly Anderson <> 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);

-       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,
+       }

        memcpy(p, &cp, sizeof(cp));
        memcpy(r, &cr, sizeof(cr));
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