Library and Version

PhysX v5.6.0

Operating System

Centos 7

Steps to Trigger Behavior

More than OverlapFilterTask::MaxPairs (64 right now) overlaps should be created by broadphase and some of them should be filtered during NPhaseCore::runOverlapFilters e.g. by returning PxFilterFlag::eKILL from filter shader.

In Sc::Scene::preallocateContactManagers filtered overlaps are being gathered/compacted inside AABBManagerBase::mCreatedOverlaps.
It is incorrectly done with PxMemCopy instead of PxMemMove, since pairs/OverlapFilterTask::mPairs are spans in mCreatedOverlaps and therefore may overlap.

Expected Behavior

No overlaps are lost/duplicated.

Actual Behavior

Due to different memcpy implementations handling overlapping regions differently, actual behavior is undefined.
Issue happens for me on very old libc provided by Centos 7: it fills dest with multiple copies of ~64byte sized region, or something like that.
It is still incorrect to memcpy overlapping regions though!