Before reporting that you are seeing a duplicate accept in Tomcat please
ensure that:

* You are using a version of Linux with a kernel later than 5.10-rc6.

* You are using a version of Tomcat which is later than Tomcat 9.0.59,
and preferably greater than 9.0.63.

The bug is believed to be fixed with Linux kernel versions later than
5.10-rc6 but some versions of Tomcat prior 9.0.59 to will emit the
"Duplicate accept detected." message in error, even with Linux kernel
versions later than 5.10-RC6.  For more info see:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1924298/comments/27

Once you have verified both the Linux kernel version & the version of
Tomcat you are running, then make a report and be sure to include both
the kernel & Tomcat versions.

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https://bugs.launchpad.net/bugs/1924298

Title:
  accept returns duplicate endpoints under load

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