Re: [PATCH net v2] net: do not let defer_count outlive an empty defer_list

[Joseph Kain]

On Thu, Oct 8, 2026 at 3:16 PM <netdev-bot+sinfo@xxxxxxxxxx> wrote:
>
> Hi!
>
> This is an automated message. This series looks like a fix, but its
> commit messages seem to be missing some information:
>
>  - How the issue was discovered, e.g. hit in production, hit during
>    development, syzbot report, manual code inspection, LLM or static
>    analysis tool scan.

  Manual code inspection, LLM-assisted, during a backport -- not hit in
  production.  I hit the heavy contention on sd->defer_lock in
production and had Claude Opus

  The context: an arm64 PREEMPT_RT system hit the sd->defer_lock convoy that
  844c9db7f7f5 removes, where a descheduled lock holder queued every other
  consumer of that NIC's skbs behind it. While backporting that conversion
  to 6.1 I read through the new code and found the absorbing state this
  patch fixes.


>
> Please do not repost the series just to address the above. Instead,
> reply to this email with the missing information, so that reviewers
> can take it into account. If the series needs another revision for
> other reasons, please include the information in the commit messages
> then.
>
> The evaluation is done by an LLM so it may be wrong, if you think
> that is the case please reply and explain.