Review Request: JDK-8228671: Fastdebug VM throws InternalError when is used to resolve a member

Mandy Chung mandy.chung at
Sat Jul 27 21:33:54 UTC 2019

On 7/26/19 11:51 PM, Alan Bateman wrote:
> On 26/07/2019 22:12, Mandy Chung wrote:
>> Debug VM checks if a class is accessible to the lookup class except 
>> if the lookup class is java.lang.Object (which was the lookup class 
>> of publicLookup previously). WithJDK-8173978, Lookup::in has changed 
>> and it can be used to create a new public Lookup on a different 
>> lookup class.
>> A quick fix for this bug is to pass Object.class for resolution for a 
>> Lookup object with UNCONDITIONAL mode as previously.  The lookup 
>> class and allowed modes are used to check if the resolved member is 
>> accessible to this Lookup object.  We should re-examine this area in 
>> particular publicLookup (see JDK-8173977).
> Looks okay as a quick fix, surprised it is only caught with tier5 or 6 
> testing.

It was a surprise that this was not caught in our tier1-3 testing. We 
shall revisit and expand tier1-3 to execute certain tests such as 
jdk_lang group in fastdebug mode.

> I assume JDK-8173977 will need a priority boost.

It may be time to revisit this together with loader constraints 
(although they are orthogonal).


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