From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cong Wang <xiyou.wangcong@gmail.com>
Subject: Re: Fw: [Bug 60669] Kernel panic when using negative priority for
 HTB class
Date: Fri, 2 Aug 2013 04:50:16 +0000 (UTC)
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References: <20130801211231.1b25c3be@nehalam.linuxnetplumber.net>
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On Fri, 02 Aug 2013 at 04:12 GMT, Stephen Hemminger <stephen@networkplumber.org> wrote:
>
> --- Comment #2 from _Vi <vi0oss@gmail.com> ---
> Reproducible on 3.11.0-rc3
>
> Looks like negative priority value is essential for the kernel panic.
>

There is a check for prio:

                if ((cl->prio = hopt->prio) >= TC_HTB_NUMPRIO)
		                        cl->prio = TC_HTB_NUMPRIO - 1;