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Votes

3

Found in

2019.4

2019.4.28f1

2020.3

2021.1

2021.2

2022.1

Issue ID

1344907

Regression

No

"The script '<script>' could not be instantiated!" error produced in build when a script creates an object that calls GC.Handle

IL2CPP

-

Steps to reproduce:
1. Open the attached project ("1344907.zip")
2. Open "SampleScene"
3. Make sure IL2CPP is selected as the current Scripting Backend (Edit -> Project Settings -> Player -> Scripting Backend)
4. Build and run the project
5. Open the Player logs (https://docs.unity3d.com/Manual/LogFiles.html)

Expected results: No errors are produced, script is instantiated
Actual results: "The script '<script>' could not be instantiated!" error is produced

Reproducible with: 2019.4.28f1, 2020.3.11f1, 2021.1.14f1, 2021.2.0b2, 2022.1.0a1
Didn't test on 2018.4 because couldn't find Player logs

Notes:
- The full scenario is that a MonoBehaviour script creates an object that calls GC.Handle for another object containing just a variable declaration
- Calling GC.Handle on the same class but in start instead of creating an object produces this error:
"ArgumentException: Object contains non-primitive or non-blittable data."
- Doesn't reproduce with Mono

  1. Response avatar

    Resolution Note (2022.1.X):

    IL2CPP follows the documented behavior for GCHandle.Alloc with GCHandleType.Pinned - it will throw an ArgumentException if passed a non-blittable type.

Comments (2)

  1. 7933c2380b3c25c9f0f4d06ccf78c488?d=mm

    VoodooDetective

    Jun 28, 2021 19:04

    I just wanted to add, the "non-blittable data" error is happening in that reproduction because the "B" class needs to have this attribute on it:

    [StructLayout(LayoutKind.Sequential)]

    That has nothing to do with the bug being reported though.

  2. 7933c2380b3c25c9f0f4d06ccf78c488?d=mm

    VoodooDetective

    Jun 25, 2021 18:53

    This breaks "Programmer Instrument" in FMOD.

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