A couple of unrelated issues:

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libNativeAccess.c has some build warnings due to casting from a 32-bit pointer to a 64-bit signed jlong:

/home/nicgas01/jdk/test/jdk/java/foreign/libNativeAccess.c: In function 'Java_TestNative_getByteRaw':
/home/nicgas01/jdk/test/jdk/java/foreign/libNativeAccess.c:30:18: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
     jbyte *arr = (jbyte*)addr;

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java/foreign/TestArrays.java testTooBigForArray() crashes the VM because it tries to allocate a Integer.MAX_VALUE * 2 byte buffer. When this is aligned up to HeapWordSize it overflows a 32-bit size_t.

# Java VM: OpenJDK Server VM (fastdebug 15-internal+0-adhoc.nicgas01.jdk, mixed mode, sharing, g1 gc, linux-arm)
# Problematic frame:
# V [libjvm.so+0x4b5926] Copy::fill_to_memory_atomic(void*, unsigned int, unsigned char)+0xc

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java/foreign/TestByteBuffer.java fails on 32-bit Arm due to unaligned accesses.

test TestByteBuffer.testResizeRoundtripHeap(TestByteBuffer$$Lambda$69/0xd1ae9438@151acc1, TestByteBuffer$$Lambda$62/0xd1a9a638@1296ffe, [100:B64]): failure
java.lang.IllegalStateException: Misaligned access at address: 12