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Async JSB Method execution Deadlock when spawning Tasks when ConcurrentTaskExecution = false #3293

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amaitland opened this issue Nov 25, 2020 · 1 comment
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Async JSB Method execution Deadlock when spawning Tasks when ConcurrentTaskExecution = false #3293

amaitland opened this issue Nov 25, 2020 · 1 comment
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@amaitland
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bug
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86.0.x

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@amaitland
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  • What version of the product are you using?
    85.3.130

  • What architecture x86 or x64?
    Both

  • On what operating system?
    Any

  • Are you using WinForms, WPF or OffScreen?
    All

  • What steps will reproduce the problem?

    • Call an Async method from javascript that waits on a Task to complete that uses Task.Run

Example provided at https://github.com/kiewic/cefsharp-demo/blob/30cf8c4d7060bc41a1b0007507edf942e211cda0/CefSharpApp/BoundObject.cs

  • What is the expected output? What do you see instead?
    Method execution to complete successfully, instead it deadlocks

  • Please provide any additional information below.
    It's likely the LimitedConcurrencyLevelTaskScheduler used by MethodRunnerQueue is being inherited from the spawned Task. As there is only a single execution allowed the Task deadlocks.
@amaitland amaitland added the bug label Nov 25, 2020
@amaitland amaitland added this to the 86.0.x milestone Nov 25, 2020
@amaitland amaitland self-assigned this Nov 25, 2020
@amaitland
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For reference https://stackoverflow.com/a/28375074

amaitland added a commit that referenced this issue Nov 25, 2020
@amaitland
Core - MethodRunnerQueue use TaskCreationOptions.HideScheduler to
80753eb 
To prevent subtasks from attempting to use our LimitedConcurrencyLevelTaskScheduler we need to
specify TaskCreationOptions.HideScheduler when creating the Task

Resolves #3293
@amaitland amaitland mentioned this issue Nov 25, 2020
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