ADDITIONAL SYSTEM INFORMATION :
Debian i386

A DESCRIPTION OF THE PROBLEM :
having this structure:
struct s_i8_i64 {
    int8_t _0_i8;
    int16_t _1_i16;
    int8_t _2_i8;
    int32_t _3_i32;
    int8_t _4_i8;
    int64_t _5_i64;
    int8_t _6_i8;
    int64_t _7_i64;
    int8_t _8_i8;
    int32_t _9_i32;
    int8_t _10_i8;
    int16_t _11_i16;
    int8_t _12_i8;
};

the starting offset is 28 on i386, so it is aligned at the 4 boundary.

So accessing this field in memory I got:
java.lang.IllegalArgumentException: Misaligned access at address: 1683619964
at java.base/java.lang.invoke.VarHandleSegmentViewBase.newIllegalArgumentExceptionForMisalignedAccess(VarHandleSegmentViewBase.java:57)
at java.base/java.lang.invoke.VarHandleSegmentAsLongs.offsetNoVMAlignCheck(VarHandleSegmentAsLongs.java:100)
at java.base/java.lang.invoke.VarHandleSegmentAsLongs.set(VarHandleSegmentAsLongs.java:121)
at java.base/java.lang.foreign.MemorySegment.set(MemorySegment.java:1383)



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
access a memory address as JAVA_LONG with the alignment 4.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No IllegalArgumentException thrown
ACTUAL -
IllegalArgumentException

---------- BEGIN SOURCE ----------
    @Test
    public void testInt64_tAt4() {
        MemorySegment mem = MemorySegment.allocateNative(16, 4, MemorySession.openImplicit());
        assertEquals(16, mem.byteSize());
        byte b = mem.get(ValueLayout.JAVA_BYTE, 0);
        System.out.println("b: " + b);
        long l = mem.get(ValueLayout.JAVA_LONG, 4);
        System.out.println("l: " + l);
    }

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
none that I know of.

FREQUENCY : always