[11] RFR(XS) 8202152: test/hotspot/jtreg/runtime/whitebox/WBStackSize.java fails

[David Holmes]

Hi Vladimir,

On 24/04/2018 5:20 AM, Vladimir Kozlov wrote:
> http://cr.openjdk.java.net/~kvn/8202152/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8202152
> 
> After 8198756 changes compiler threads could be released and other Java 
> threads can re-use the same HW threads for which stack size was 
> determined during start. The test WBStackSize.java may fail in such 
> cases because Java thread stack size is set and checked in test.

That does not make sense to me. We don't "re-use HW threads" - I'm not 
even sure what that means. Compiler threads have a different stacksize 
to other Java threads - that seems simple enough.

> For 8198756 changes we added thread name check to workaround the problem 
> [1]. But it seems is not enough.

Why would this test be run in a compiler thread ????

> To avoid this issue I added -XX:CompilerThreadStackSize=512 flag to 
> match Java thread stack size (note, size is in Kb for this flag).

That seems like a workaround of the real problem.

David
-----

> I also reverted changes in test code and instead added thread name print 
> to know in case we still have problem in a future.
> 
> Tier1 testing (which run the test) passed.
>