[8u-dev] Review request : JDK-8062904: TEST_BUG: Tests java/lang/invoke/LFCaching fail when run with -Xcomp option

[Vladimir Ivanov]

Konstantin,

 >> I'd like to get an answer to my previous question:
 >> "How reliable the test is if it ignores NoSuchMethodException &
 >> VirtualMachineError? Are there other manifestations of the problem?"
 >>
 >> Most notably, have you seen VM crashes w/ -Xcomp running that test?
 > I have seen no crashes with -Xcomp in our tests results base, only
 > NoSuchMethodException and VirtualMachineError.
Good. Thanks for the info.

 > This failure does not occur with JDK 9 on -Xcomp, I used the same random
 > seeds (-Dseed), and the problem exists only with JDK 8u, not JDK 9.
 >
 > Because there is no failure with JDK 9 I can suppose there could be a
 > product issue in JDK 8u.
That's strange. There should be no difference in MethodHandle stub 
management between 8u & 9 now (once allocated they stay forever). 9 has 
segmented code cache feature and it can lead to observable differences 
in behavior.

How many iterations does the test perform on 8u & 9? What if you 
increase the number? Also, I'd suggest you to monitor code cache usage 
during the run and when the test finishes.

Best regards,
Vladimir Ivanov