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Fixed in 2021.3.29f1, 2022.3.2f1, 2023.1.0b19, 2023.2.0a15



Found in






Issue ID




Crash on CachedWriter::Write when building AssetBundle (.byte file >2GB)



Reproduction steps:
1. Open the user’s attached project
2. Click “Assets/Video/sample.bytes”
3. In the Inspector Window, under the “Asset Labels”, click the “AssetBundle” dropdown
4. In the dropdown, select “New…” and enter any name
5. Click Build > “Asset Bundles”

Expected result: AssetBundle is created from the .bytes file
Actual result: Unity Editor crashes

Reproducible with: 2021.2.0a17, 2021.3.11f1, 2022.1.19f1, 2022.2.0b9, 2023.1.0a13
Couldn’t test with: 2020.3.40f1, 2021.2.0a16 (crashed when clicking “Assets/Videos/sample.bytes” because of Size overflow in allocator)

Reproducible on: Window 11 Pro 21H2

First lines of the stack trace:

{noformat}0x00007ff7202e5033 (Unity) CachedWriter::Write
0x00007ff7205a9df2 (Unity) TextAsset::Transfer<StreamedBinaryWrite>
0x00007ff720679e47 (Unity) SerializedFile::WriteObject
0x00007ff720664279 (Unity) PersistentManager::WriteFile
0x00007ff720665e5f (Unity) PersistentManager::WriteFile{noformat}

Note: Reimport project on every version change

Note: This is caused because the Videos/sample.byte file is more than 2GB. Unity does not support more than 2GB in the serialization of a single object and content of a .byte file will be stored as an embedded object inside the AssetBundle. Such a large object is almost certainly not going to be efficient, even if we did support such a large size. When fixing this ticket we would aim to add an error message and build failure in this case, rather than letting the Editor crash.

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