Search Issue Tracker

Fixed in 2021.2.X

Fixed in 2019.4.X, 2020.3.X, 2021.1.X



Found in




Issue ID




[Mobile] Calling Resources.Load() while asynchronously loading assetbundle by UnityWebRequest makes main thread stuck



Reproduction steps:
1. Open the attached project
2. Build and Run on an Android device

Expected behavior: The application does not freeze, spinning cubes are present on the screen
Actual behavior: The application is frozen, sometimes cubes can be loaded in the scene but they do not spin, the issue is not consistent, reopening the build might be required

Reproduces on: 2020.1.0a19, 2020.1.6f1, 2020.2.0b3
Not reproducible on: 2018.4.27f1, 2019.4.10f1, 2020.1.0a18

Reproducible with:
VLNQA00320, Xiaomi - (Redmi Note 8 Pro), Android 9, CPU: MediaTek Helios G90T MT6785T, GPU: Mali-G76 MC4 -> (Highest chance of reproducibility)
VLNQA00314, Lge Nexus 5X (Nexus 5X), Android 8.0.0, CPU: Snapdragon 808, GPU: Adreno (TM) 418
VLNQA00273, Vivo V1821BA (V1821A), Android 9, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00022, Xiaomi Redmi Note 3 (Redmi Note 3), Android 6.0.1, CPU: Snapdragon 617 MSM8952, GPU: Adreno (TM) 510
VLNQA00052, Xiaomi MI MAX (MI MAX), Android 7.0, CPU: Snapdragon 617 MSM8952, GPU: Adreno (TM) 510

Not reproducible with:
-VLNQA00310 iPad Pro 12.9 1st gen (iOS 13.4.1)
-iPhone 6S (13.3.1)

  1. Resolution Note (fix version 2021.2):

    For "async/await" function to work correctly, "await" needs to be put in every functions from "async void Start()" to every "async" functions called after. There is always a risk of deadlock when using a mix of sync and async. In this case an async function is missing an await which may be causing the freeze.

  2. Resolution Note (fix version 2021.1):

    Fixed in 2021.1.0b12

Comments (2)

  1. vkinglangzi

    Dec 03, 2022 09:04

    How can I download the sample

Add comment

Log in to post comment

All about bugs

View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.