RFR(S) 8205105: VM crashes with "assert(Universe::heap()->is_in_reserved(start + words - 1)) failed: not in heap

[Vladimir Kozlov]

On 6/20/18 3:22 PM, Igor Veresov wrote:
> 
> 
>> On Jun 20, 2018, at 3:20 PM, Vladimir Kozlov <vladimir.kozlov at oracle.com> wrote:
>>
>> Why Graal is affected even when LOHP is not used?
> 
> LOHP is dynamically turned on by JVMTI.

Okay. In other world we can't use fast TLAB refill because JVMTI can 
switch on LOHP at any time. Got it.

I still did not get why GC tests which do not use LOHP still fail with 
Graal. And how these changes fix it?

Thanks,
Vladimir

> 
>>
>> I don't see changes which mapped new TLAB fields added by Low-Overhead Heap Profiling.
>>
>> I don't see your answers to Stefan's comment in bug report about Graal's code which is not fixed for _allocation_end.
>>
>> Does Graal still use fast TLAB refill as default mode?
> 
> You cannot use TLAB refill with LOHP at all.
> 
>>
>> FastTLABRefill was deprecated by 8194084: "Obsolete FastTLABRefill and remove the related code":
>>
>> http://hg.openjdk.java.net/jdk/jdk/rev/9010e596f391
>>
>> Should we remove it from Graal too?
>>
> 
> Not for JDKs <11.
> 
> igor
> 
>> Thanks,
>> Vladimir
>>
>> On 6/20/18 2:47 PM, Igor Veresov wrote:
>>> Low-Overhead Heap Profiling is not compatible with fast TLAB refill. It needs to be disabled.
>>> Webrev: http://cr.openjdk.java.net/~iveresov/8205105/webrev/
>>> Thanks,
>>> igor
>