RFR(T): 8239503: FieldLayout/OldLayoutCheck.java fails due to "RuntimeException: Misplaced int field: expected 24 to equal 12"

[David Holmes]

On 21/02/2020 6:38 am, Daniel D. Daugherty wrote:
> Greetings,
> 
> We have a Tier3 failure that's causing a bit of noise in the CI.
> 
> Per has determined that the test in question should not run with ZGC

This seems a temporary workaround. Obviously there are issues with the 
new field layout code and interaction with ZGC that have not been 
accounted for. The underlying problem presumably needs to be addressed 
and now we won't have an open bug for that. I would have treated this 
like a "problem listing" and created a sub-task.

Cheers,
David
-----

> and added a patch to the bug report. I'm testing that patch with a
> Tier3 test run right now...
> 
> Here's what it looks like:
> 
> $ hg diff
> diff -r 38fc3785784a 
> test/hotspot/jtreg/runtime/FieldLayout/OldLayoutCheck.java
> --- a/test/hotspot/jtreg/runtime/FieldLayout/OldLayoutCheck.java Thu Feb 
> 20 20:04:15 2020 +0000
> +++ b/test/hotspot/jtreg/runtime/FieldLayout/OldLayoutCheck.java Thu Feb 
> 20 15:20:47 2020 -0500
> @@ -28,7 +28,7 @@
>    * @library /test/lib
>    * @modules java.base/jdk.internal.misc
>    *          java.management
> - * @requires vm.bits == "64"
> + * @requires vm.bits == "64" & vm.gc != "Z"
>    * @run main/othervm -XX:+UseCompressedClassPointers 
> -XX:-UseEmptySlotsInSupers OldLayoutCheck
>    */
> 
> 
> Thanks, in advance, for any comments, questions or suggestions.
> 
> Dan
>