Bugfix: graceful shutdown of old worker processes might be delayed when using HTTP/2.

[Sébastien Rebecchi]

Hi!

We are using nginx a lot in our company for high HTTP/2 workloads.

I saw freenginx has applied a bugfix in their last mainline release 1.27.1,
see https://freenginx.org/en/CHANGES

    *) Bugfix: graceful shutdown of old worker processes might be delayed
       when using HTTP/2.
       Thanks to Kasei Wang.

I wanted to know if there was a plan to apply that fix also in nginx,
cause I see that worker processes are in practise very long to shut
down (12 worker processes, when reload signal is sent then it takes
more than 3 minutes until the last worker is down), which is a problem
in our case.

Thank you

Sébastien
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