RFR: 8255343: Problemlist java/util/stream/SpliteratorTest.java on 32-bit platforms until JDK-8254162

[Maurizio Cimadamore]

On Fri, 23 Oct 2020 14:26:07 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> It currently fails on x86_32 with `java.lang.IllegalStateException: Misaligned access at address: 12`. I checked that once JDK-8254162 integrates, that issue is gone. Until then, having clean x86_32 testing is beneficial for other work.
>> 
>> Testing:
>>  - [x] Affected test on Linux x86_64 (still passes)
>>  - [x] Affected test on Linux x86_32 (now ignored)
>
> I'm not sure I get as to why the test fails on 32 bits - in the sense that it does not seem to rely on platform specific assumptions (at least on a quick look). On top of my head I'm not aware of what might have caused this to start working again in JDK-8254162, so maybe some more investigation is required?
> 
> At the very least we should only disable the problematic spliterator test, which is, I believe "testSegmentSpliterator" - and leave the other running, which is useful, as this is an important stress test for spliterators.

Ok - I understand at least why JDK-8254162 fixed it - JDK-8254162 uses a new API to access memory (MemoryAccess) which disables alignment checks, so that's why the issue doesn't happen. But that means that there could be a latent issue in the test. Looking deeper.

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PR: https://git.openjdk.java.net/jdk/pull/836