IL2CPP compile error with NativeList<T> and IJobParallelFor

Hi.

I am experiencing an error when compiling jobs on IL2CPP.
This is on Unity 2018.3.2 with the latest packages but happens on earlier versions also.

In the example I create a NativeList that is passed to a IJobParallellFor jo as a deferred NativeArray.
It does a simple add to the int in the array and tries to read the result.

The problem seems to be when adding the NativeList as parameter to the parallell job Schedulke to tell it the job length/array count.

Code (csharp):

1.  
2. JobHandle handle = addJob.Schedule(sourceList ,1);
3.  

This works good in the editor and compiled with mono but gives an NullReferenceException on IL2CPP compiled standalone builds. See error below.

running the same code with a hardcoded length in the Schedule function works good.

It does not seem to be related to the burst compiler. I get an error with and without the
[BurstCompile] tag.

Any ideas on a workaround or fix?

Lennart

Code (csharp):

1.  
2. using Unity.Burst;
3. using Unity.Collections;
4. using Unity.Jobs;
5. using UnityEngine;
6. using UnityEngine.UI;
7.  
8. //[BurstCompile]
9. public struct AddJob : IJobParallelFor
10. {
11.     public NativeArray<int> SourceArray;
12.  
13.     public void Execute(int index)
14.     {
15.         SourceArray[index] += 1;
16.     }
17. }
18.  
19. public class Testscript : MonoBehaviour
20. {
21.     public Text ResultText;
22.  
23.     void Update()
24.     {
25.         NativeList<int> sourceList = new NativeList<int>(Allocator.TempJob);
26.         sourceList.Add(0);
27.  
28.         AddJob addJob = new AddJob
29.         {
30.             SourceArray = sourceList.AsDeferredJobArray()
31.         };
32.  
33.         JobHandle handle = addJob.Schedule(sourceList ,1);
34.         handle.Complete();
35.  
36.         ResultText.text ="Result: " + sourceList[0].ToString();
37.         sourceList.Dispose();
38.     }    
39. }
40.  

Code (csharp):

1.  
2.  
3. NullReferenceException: Object reference not set to an instance of an object.
4.   at Unity.Jobs.IJobParallelForDeferExtensions+ParallelForJobStruct`1[T].Initialize () [0x00000] in <00000000000000000000000000000000>:0
5.   at Unity.Jobs.IJobParallelForDeferExtensions.Schedule[T,U] (T jobData, Unity.Collections.NativeList`1[T] list, System.Int32 innerloopBatchCount, Unity.Jobs.JobHandle dependsOn) [0x00000] in <00000000000000000000000000000000>:0
6.   at Testscript.Update () [0x00000] in <00000000000000000000000000000000>:0
7.  
8.  

 

I made a bug report with the sample project. Case 1119844

 

Unity was able to reproduce it.

 

https://issuetracker.unity3d.com/is...when-passing-nativelist-to-a-ijobparallellfor

Link to the issue tracker.