After compressed opcodes were enabled by default, we  may have a 4-byte opcode located at 2-byte aligned address, but not 4-byte aligned address ( e.g. ending with 2/6/a/e in hex form)

This code then may produce misaligned read, and on some hardware (e.g. hifive) may result in misaligned load emulation thru m-mode

  static bool is_deopt_at(address instr) {
    assert(instr != nullptr, "");
    uint32_t value = *(uint32_t *) instr;
    // 0xc0201073 encodes CSRRW x0, instret, x0
    return value == 0xc0201073;
  }

direct pointer dereference should be replaced with a proper method