IPv6 tests failing on test-docker-ubuntu2204-ppc64le-1

[Haroon-Khel]

ref #2883 (comment)

java/net/Inet6Address/B6206527.java and java/net/ipv6tests/B6521014.java fail on https://ci.adoptium.net/computer/test-docker-ubuntu2204-ppc64le-1/

Latest failures

java/net/Inet6Address/B6206527.java
https://ci.adoptium.net/view/Test_grinder/job/Grinder/6711/console

java/net/ipv6tests/B6521014.java
https://ci.adoptium.net/view/Test_grinder/job/Grinder/6716/console

This static docker container runs on dockerhost-skytap-ubuntu2204-ppc64le-1, which also hosts test-docker-ubuntu2204-ppc64le-2. The tests pass on -2 but fail on -1

Latest pass on -2

java/net/Inet6Address/B6206527.java
https://ci.adoptium.net/view/Test_grinder/job/Grinder/6712/console

java/net/ipv6tests/B6521014.java
https://ci.adoptium.net/view/Test_grinder/job/Grinder/6717/console

On any new ubuntu2204 container created on dockerhost-skytap-ubuntu2204-ppc64le-1 the tests will fail.

I've taken -1 offline and recommend keeping it so until this is resolved

[sxa]

Maybe verify if the parameter that @sophia-guo added recently for the reproducible test comparison makes any difference to this.
Maybe also verify that the correct IPv6 options are on this dockerhost, and confirm that other containers on the host are affected or whether it's specific to Ubuntu 2204 (and later?)

[sophia-guo]

For reproducible tests this is solved by configuring namespaced kernel parameters (sysctls) at runtime (--sysctl). Note Docker does not support changing sysctls inside of a container that also modify the host system. https://github.com/adoptium/temurin-build/pull/4020/files