netdev - Re: iproute2 4.14.1 tc class add come to kernel-panic

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Message-ID: <992E917AA62349519EA5C7AC46D8AF55@ROLANDAMD64>
Date:   Wed, 31 Jan 2018 08:46:54 +0100
From:   "Roland Franke" <fli4l@...nke-prem.de>
To:     "Cong Wang" <xiyou.wangcong@...il.com>
Cc:     "Stephen Hemminger" <stephen@...workplumber.org>,
        "Eric Dumazet" <eric.dumazet@...il.com>,
        "Linux Kernel Network Developers" <netdev@...r.kernel.org>
Subject: Re: iproute2 4.14.1 tc class add come to kernel-panic

Hello,

> On Tue, Jan 30, 2018 at 9:46 AM, Roland Franke <fli4l@...nke-prem.de> 
> wrote:
>> Hello,
>>
>>> Well, not min_qdisc things, but it should be resolved by:
>>
>>> commit efbf78973978b0d25af59bc26c8013a942af6e64
>>> Author: Cong Wang <xiyou.wangcong@...il.com>
>>> Date:   Mon Dec 4 10:48:18 2017 -0800
>>
>>>     net_sched: get rid of rcu_barrier() in tcf_block_put_ext()
>>
>>
>> Against what kernel-version was this be made?
>> patch from https://patchwork.ozlabs.org/patch/844372/
>> will not fit against kernel 4.14.15
>>

> It is merged during 4.15 window, it was to address a performance
> issue, I don't realize it fixes any bug until you report this.

> If you need, we can ask DaveM to queue it for stable, but it may
> need some other commit too.

It is not for me. It is a general question, if tc schould work with
the requested function general not with the kernel-line 4.14 (As
i was thinking that this should be come to a very long support.
(As i was suggest to read in an german page for computers; but
it may be a mistake from my side)
Or if the 4.14 series come to a "short end" and then it take no
matter when the function not work.

Best regards.