[jdk17] RFR: JDK-8265369 [macos-aarch64] java/net/MulticastSocket/Promiscuous.java failed with "SocketException: Cannot allocate memory" [v2]

[Daniel Fuchs]

On Wed, 16 Jun 2021 22:10:56 GMT, Mark Sheppard <msheppar at openjdk.org> wrote:

>> JDK-8265369 [macos-aarch64] java/net/MulticastSocket/Promiscuous.java failed with "SocketException: Cannot allocate memory"
>> 
>> The test java/net/MulticastSocket/Promiscuous.java has been observed to fail on a regular basis on macosx-aarch.
>> This is typically under heavy test load on a test machine. Analysis of the problem have
>> shown that the setsockopt for joining a multicast group will intermittently fail with ENOMEM.
>> 
>> While analysis of test environment shows significant memory usage and some memory pressure, it is
>> not excessive and as such it is deemed transition or temporary condition, such that a retry of the
>> setsockopt system call, has been seen to mitigate the issue. This adds to the stability of the
>> Promiscuous.java test and reduces test failure noise.
>> 
>> The proposed fix is in open/src/java.base/unix/native/libnet/PlainDatagramSocketImpl.c
>> in the mcast_join_leave function.  That is, if setsockopt to join an mcast group fails, and the errno == ENOMEM, 
>> then re-invoke the setsockopt system call for joining a mcast group.
>> The change has been applied as a conditional compilation.
>> Additionally this change result in the Promiscuous.java test being removed from the
>> ProblemList.txt.
>> 
>> Please oblige and review the changes for a fix of the issue JDK-8265369
>
> Mark Sheppard has updated the pull request incrementally with one additional commit since the last revision:
> 
>   JDK-8265369 [macos-aarch64] java/net/MulticastSocket/Promiscuous.java failed with "SocketException: Cannot allocate memory"
>   amendments as per suggestion from Chris Hegarty

Thanks for the update Mark. It makes the code much easier to follow.

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Marked as reviewed by dfuchs (Reviewer).

PR: https://git.openjdk.java.net/jdk17/pull/44