When running runtime/Unsafe/InternalErrorTest.java I hit this assert once.
Setting to runtime as the value should be coming from the interpreter.

# Internal Error (/home/rehn/source/jdk/open/src/hotspot/share/utilities/copy.cpp:75), pid=170046, tid=170127
# assert(is_aligned(byte_count, elem_size)) failed: byte_count 125 must be multiple of element size 2
#
# JRE version: OpenJDK Runtime Environment (23.0) (fastdebug build 23-internal-releaserobbin)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 23-internal-releaserobbin, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-riscv64)
# Problematic frame:
# V [libjvm.so+0x786384] void CopySwap::conjoint_swap_if_needed<false>(void const*, void*, unsigned long, unsigned long) [clone .part.0]+0x18

Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0x786384] void CopySwap::conjoint_swap_if_needed<false>(void const*, void*, unsigned long, unsigned long) [clone .part.0]+0x18 (copy.cpp:75)
V [libjvm.so+0x787808] void CopySwap::conjoint_swap_if_needed<true>(void const*, void*, unsigned long, unsigned long)+0x982 (copy.cpp:73)
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j jdk.internal.misc.Unsafe.copySwapMemory0(Ljava/lang/Object;JLjava/lang/Object;JJJ)V+0 java.base@23-internal
j jdk.internal.misc.Unsafe.copySwapMemory(Ljava/lang/Object;JLjava/lang/Object;JJJ)V+33 java.base@23-internal
j InternalErrorTest.test(Ljava/nio/MappedByteBuffer;Ljdk/internal/misc/Unsafe;JJI)V+66
j InternalErrorTest.main([Ljava/lang/String;)V+231
j java.lang.invoke.LambdaForm$DMH+0x000000004c0c1800.invokeStatic(Ljava/lang/Object;Ljava/lang/Object;)V+10 java.base@23-internal
j java.lang.invoke.LambdaForm$MH+0x000000004c0c2c00.invoke(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;+33 java.base@23-internal
j java.lang.invoke.Invokers$Holder.invokeExact_MT(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;+20 java.base@23-internal
j jdk.internal.reflect.DirectMethodHandleAccessor.invokeImpl(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+55 java.base@23-internal
j jdk.internal.reflect.DirectMethodHandleAccessor.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+23 java.base@23-internal
j java.lang.reflect.Method.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;+102 java.base@23-internal
j com.sun.javatest.regtest.agent.MainWrapper$MainTask.run()V+134
j java.lang.Thread.runWith(Ljava/lang/Object;Ljava/lang/Runnable;)V+5 java.base@23-internal
j java.lang.Thread.run()V+19 java.base@23-internal
v ~StubRoutines::call_stub 0x00002aaac520c4aa