RFR: JDK-8311261: [AIX] TestAlwaysPreTouchStacks.java fails due to java.lang.RuntimeException: Did not find expected NMT output

[Tyler Steele]

On Fri, 21 Jul 2023 12:21:58 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

>>> [1.083s][info][os,thread] Thread "Unknown thread" started (pthread id: 5143, attributes: stacksize: 2112k, guardsize: 0k, detached). 
>>> [1.084s][info][os,thread] Thread is alive (tid: 5143, kernel thread id: 81528083, stack [0x0000000116a10000 - 0x0000000116c1d888 (2102k using 64k pages)).
>>> [1.291s][info][os,thread] Thread "Unknown thread" started (pthread id: 5656, attributes: stacksize: 4096k, guardsize: 0k, detached). 
>>> [1.291s][info][os,thread] Thread is alive (tid: 5656, kernel thread id: 84280773, stack [0x0000000116c30000 - 0x000000011702d888 (4086k using 64k pages)).
>> 
>> @tstuefe It is already 64K aligned and the test is failing with  `-XX:-Use64KPages`
>
>> > [1.083s][info][os,thread] Thread "Unknown thread" started (pthread id: 5143, attributes: stacksize: 2112k, guardsize: 0k, detached).
>> > [1.084s][info][os,thread] Thread is alive (tid: 5143, kernel thread id: 81528083, stack [0x0000000116a10000 - 0x0000000116c1d888 (2102k using 64k pages)).
>> > [1.291s][info][os,thread] Thread "Unknown thread" started (pthread id: 5656, attributes: stacksize: 4096k, guardsize: 0k, detached).
>> > [1.291s][info][os,thread] Thread is alive (tid: 5656, kernel thread id: 84280773, stack [0x0000000116c30000 - 0x000000011702d888 (4086k using 64k pages)).
>> 
>> @tstuefe It is already 64K aligned and the test is failing with `-XX:-Use64KPages`
> 
> No idea then. You'd need to investigate.

Thanks @tstuefe. Seems like there is something else going on that makes this test unsuitable on AIX.

Thanks @varada1110 for investigating.

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PR Comment: https://git.openjdk.org/jdk/pull/14923#issuecomment-1648149163