Add new test scenario

fuzz/fuzz_targets/snapshot2.rs

@@ -1,4 +1,3 @@
-#![allow(dead_code)]
 #![no_main]
 use ckb_vm::{
     elf::{LoadingAction, ProgramMetadata},
@@ -61,7 +60,11 @@ impl DataSource<u32> for DummyData {
         };
         let offset = std::cmp::min(offset as usize, data.len());
         let full_size = data.len() - offset;
-        let real_size = std::cmp::min(full_size, length as usize);
+        let real_size = if length > 0 {
+            std::cmp::min(full_size, length as usize)
+        } else {
+            full_size
+        };
         Ok((data.slice(offset..offset + real_size), full_size as u64))
     }
 }
@@ -156,6 +159,19 @@ fuzz_target!(|data: [u8; 96]| {
             return;
         }
     }
+    for _ in 0..2 {
+        let length = deque.u32() as u64;
+        let offset = deque.u32() as u64;
+        let addr = deque.u32() as u64;
+        let data = dummy_data
+            .load_data(&DATA_SOURCE_CONTENT, offset, length)
+            .unwrap()
+            .0;
+        let result = machine1.memory_mut().store_bytes(addr, &data);
+        if result.is_err() {
+            return;
+        }
+    }
     let snapshot = ctx.make_snapshot(&mut machine1).unwrap();
     ctx.resume(&mut machine2, &snapshot).unwrap();
     for i in 0..DEFAULT_MEMORY_SIZE / RISCV_PAGESIZE {
@@ -168,8 +184,8 @@ fuzz_target!(|data: [u8; 96]| {
             .load_bytes((i * RISCV_PAGESIZE) as u64, RISCV_PAGESIZE as u64)
             .unwrap();
         if mem1 != mem2 {
-            eprintln!("mem1[0..16] = {:?}", &mem1[0..32]);
-            eprintln!("mem2[0..16] = {:?}", &mem2[0..32]);
+            eprintln!("mem1[0..32] = {:?}", &mem1[0..32]);
+            eprintln!("mem2[0..32] = {:?}", &mem2[0..32]);
             eprintln!("program length = {}", dummy_data.program.len());
             eprintln!("content length = {}", dummy_data.content.len());
             for action in &loading_action_vec {