RFR: 8341027: Crash in java/runtime/Unsafe/InternalErrorTest when runnig with -XX:-UseCompressedClassPointers

[Axel Boldt-Christmas]

On Thu, 26 Sep 2024 13:04:58 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> The JVM crashes in the GC because the destroys the length fields of the array it uses as the destination.
> 
> One example of the failures you see with this:
> 
> # guarantee(p == top()) failed: end of last object must match end of space
> ...
> V [libjvm.so+0x147e054] ContiguousSpace::verify() const+0x1e0 (space.cpp:95)
> V [libjvm.so+0x974118] DefNewGeneration::verify()+0x18 (defNewGeneration.cpp:834)
> V [libjvm.so+0x1448a88] SerialHeap::verify(VerifyOption)+0x78 (serialHeap.cpp:881)
> V [libjvm.so+0x15d9cd0] Universe::verify(VerifyOption, char const*)+0x490 (universe.cpp:1240)
> V [libjvm.so+0x1673890] VM_Exit::doit()+0xa0 (universe.hpp:349) 
> 
> 
> Fix this by changing the hard-coded 16 to the proper array base offset, which changes depending on the value of `UseCompressedClassPointers`.

lgtm.

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Marked as reviewed by aboldtch (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/21208#pullrequestreview-2331320250