From: Cong Wang <>
Date: Fri, 11 Aug 2017 14:06:31 -0700

> On Fri, Aug 11, 2017 at 1:32 PM, Florian Westphal <> wrote:
>> Cong Wang <> wrote:
>>> On Thu, Aug 10, 2017 at 2:31 AM, Konstantin Khlebnikov
>>> <> wrote:
>>> > In previous API tcf_destroy_chain() could be called several times and
>>> > some schedulers like hfsc and atm use that. In new API tcf_block_put()
>>> > frees block but leaves stale pointer, second call will free it once again.
>>> Which call path do we call tcf_block_put() for multiple times on
>>> the same block? Please be specific, it is not obvious.
>> you can use tools/testing/selftests/net/ to reproduce this
>> (kernel panics on delete of root qdisc).
> I am sure this is not how changelog works. We have enough space
> in changelog to describe a bug, don't have to leave details in a
> following-up email which will almost surely be lost in history.

Yeah, the more information in the commit log message the better.

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