A DESCRIPTION OF THE PROBLEM :
This code executes normally, although it shouldn't:

Linker linker = Linker.nativeLinker();
var padding = MemoryLayout.paddingLayout(1024).withByteAlignment(1024);
var sequence = MemoryLayout.sequenceLayout(4, padding);
var struct = MemoryLayout.structLayout(sequence);
var fd = FunctionDescriptor.of(struct, struct);
linker.downcallHandle(fd);

I think that's the problem here:
https://github.com/openjdk/jdk/blob/a8f143c6abe7669c232cabda3a4e8df726de036e/src/java.base/share/classes/jdk/internal/foreign/abi/AbstractLinker.java#L216
Because there are no additional checks on what is inside the SequenceLayout.

I highly recommend checking all the linker code related to SequenceLayout, because it seems for example for aarch64 the homogenous FP aggregate is incorrectly defined if ValueLayout are inside SequenceLayout



FREQUENCY : always