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

[Igor Veresov]

> 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. 

> 
> 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