Search Issue Tracker




Found in


Issue ID




Exiting the Update method with debugger after async/await Task.Run(method) is called will cause Unity to crash




Priority: 2Necessary for shipping a final release


Severity: 1Crash, freeze, data loss, work stops

How to reproduce:
1. Open attached project "" and scene "AsyncRepro"
2. Open Visual Studio and attach the Unity Editor for debugging
3. In Visual Studio, place a breakpoint on line 75 (on int a = 1) and uncomment line 46
4. In Unity Editor, enter Play mode
5. In Visual Studio, press "Step Out" button multiple times (shortcut is F10)
6. Observe Unity Editor

Expected result: the Editor is debugged without any casualties
Actual result: the Editor crashes

Reproducible with: 2018.3.14f1, 2018.4.0f1, 2019.1.2f1, 2019.2.0b2, 2019.3.0a2
Not reproducible with: 2018.2.21f1
Could not test with: 2017.4.27f1, 2018.3.0a1, 2018.3.0b1 (Visual Studio does not find coresponding location, unable to debug)

All about bugs

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