On Thu, 3 Aug 2023 12:06:33 GMT, Alan Bateman <[email protected]> wrote:
>> Hi @AlanBateman , >> >> I ran the Jtreg tests on **jdk17** and observed the following tests passed >> unexpectedly when I set the **VM_OPTIONS to >> `-Djdk.net.usePlainDatagramSocketImpl=true`** >> >> 1. java/net/MulticastSocket/B6427403.java >> 2. java/net/MulticastSocket/NoLoopbackPackets.java >> 3. java/net/MulticastSocket/SetLoopbackMode.java >> 4. java/net/MulticastSocket/Test.java >> >> I am curious about how setting the `jdk.net.usePlainDatagramSocketImpl` >> property impacts their behavior. I would like to understand why they pass >> with this configuration and whether it has any implications. >> >> Could you please share your insights on this matter? I appreciate your >> assistance in understanding this behavior and ensuring the correctness of >> the tests. >> >> Thank you. > >> I am curious about how setting the `jdk.net.usePlainDatagramSocketImpl` >> property impacts their behavior. I would like to understand why they pass >> with this configuration and whether it has any implications. >> >> Could you please share your insights on this matter? I appreciate your >> assistance in understanding this behavior and ensuring the correctness of >> the tests. > > I think this issue needs an authoritative summary on what AIX supports and > doesn't support. The observations reported conflict with some of the comments > so I don't think I can say definitely if there are code or test changes > required. > > For a long time, Net.canJoin6WithIPv4Group() has returned "false" on AIX so > there is no attempt to join IPv4 multicast groups with a dual IPv4/IPv6 > socket. DatagramChannel has supported multicasting since JDK 7 (2011) so if > there were issues or test failures on AIX then surely they would have been > noticed before now, or maybe all the test were excluded, or maybe the testing > was done with IPv6 disabled. > > The old DatagramSocketImpl implementation didn't have a setting/configuration > to say if a dual IPv4/IPv6 socket could join an IPv4 multicast group, it just > attempted it. Your results suggests that it works, which is surprising. Does > AIX have the equivalent of strace to trace system calls? It might be useful > to confirm that the socket is actually IPv6 and that it joining IPv4 > multicast groups. > > @AlanBateman , is it possible if there is a central place where the change > > could me made for fixing all of the multicast test cases? ... > For the networking and NIO tests then you probably should look at > jdk.test.lib.NetworkConfiguration. That has a number of AIX specific comments > that may be out of date. ... Created https://bugs.openjdk.org/browse/JDK-8315651 to address jdk.test.lib.NetworkConfiguration. ------------- PR Comment: https://git.openjdk.org/jdk/pull/14142#issuecomment-1705474529
