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[WebGL] [DOTS Web] Build crashes with "Memory access out of bounds" error when using EntityComponentBuffer



How to reproduce:
1. Open the attached project ("")
2. Open the repro scene ("Assets/Worlds/ChaosTech/ChaosTech")
3. Switch the target platform to WebGL
4. Enter Play Mode
5. Notice that that Unity doesn't crash and there are no errors in the console
6. Exit Play Mode
7. Make a WebGL build and run it

Expected results: Build does not crash
Actual results: Build crashes because of "Uncaught RuntimeError: memory access out of bounds" error

Reproducible with: 2019.3.0f4, 2020.1.0a18
Reproducible with package versions: 0.1.6, 0.1.7-preview.6
Couldn't test with 2017.4, 2018.4 (DOTS Web Platforms package is not supported), 2019.2 (project errors after downgrade)

Tested with: Chrome (79.0.3945.88), Firefox (71.0 (64-bit)) Opera (65.0.3467.78)

Note: Commenting line 122 in "NewSlotSystem.cs" script fixes the issue in the repro project

  1. Resolution Note (2020.1.X):

    Unfortunately EntityCommandBuffer.Concurrent relies on managed threads, which we cannot support for WebGL builds due to limitations with threads on the web.

Comments (3)

  1. longsl

    Sep 15, 2021 06:35

    I feel frustrated that `EntityCommandBuffer.Concurrent` can't support

  2. IVIarcI-I

    Aug 01, 2020 18:33

    I'm affraid I'm having the same issue with an empty project with just a ball on a plane with the entties and unity physics package...
    If this is a limitation from the platform, it should be made possible to build without parrallisme to avoid using the concurent version of the command buffer.

  3. pekaram

    May 17, 2020 12:52

    I have this as well

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