RFR 8226690: SIGSEGV in MetadataOnStackClosure::do_metadata

[coleen.phillimore at oracle.com]

Thanks Serguei!  I removed the replay code.
Coleen

On 9/25/19 8:54 PM, serguei.spitsyn at oracle.com wrote:
> Hi Coleen,
>
> It looks pretty good to me.
> I'm not aware much about reply.
>
> Thanks,
> Serguei
>
>
> On 9/25/19 2:29 PM, coleen.phillimore at oracle.com wrote:
>> Adding serviceability-dev.
>> Coleen
>>
>> On 9/25/19 10:33 AM, coleen.phillimore at oracle.com wrote:
>>> Summary: Dont create nmethod if classes have been redefined since 
>>> compilation start.
>>>
>>> The bug was caused by a new nmethod created with an old Method in 
>>> the metadata section.  Added verification (which hit on windows) and 
>>> NSV in the other place where the method can be replaced in the 
>>> nmethod metadata section.
>>>
>>> There are some jvmci changes (to vmStructs_jvmci.cpp) that might be 
>>> needed also in the graal compiler.
>>>
>>> Tested with tier1-6 and failing test 100 times.
>>>
>>> open webrev at 
>>> http://cr.openjdk.java.net/~coleenp/2019/8226690.01/webrev
>>> bug link https://bugs.openjdk.java.net/browse/JDK-8226690
>>>
>>> Thanks,
>>> Coleen
>>
>