Fix a potential NullReferenceException in PlacementWorker
#9386
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ReubenBond
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Mar 16, 2025
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| if (exception is null) | ||
| { | ||
| // Due to race conditions, it is possible to observe IsFaulted = true, but still Exception = null. | ||
| // This is because the state transition to Faulted might have occurred just after the Exception | ||
| // property check, but before the internal exception was retrieved. | ||
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| return new Exception("Task faulted without an exception."); |
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Are you sure about this? I don't believe it's true. If it were, that would be a serious bug in the .NET runtime.
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As I understand it, it is a trade off to avoid locking, see: https://source.dot.net/System.Private.CoreLib/R/0bdc783f2cd45895.html
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ReubenBond
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Mar 16, 2025
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LGTM, thanks @ledjon-behluli! |
ReubenBond
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PlacementWorkerNullReferenceException in PlacementWorker
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Fixes a potential issue where
Task.Exceptioncould be null due to race conditions or when tasks were canceled but not explicitly caught by the user. Instead of relying on implicit cancellation handling, this change ensures that exceptions are properly set when needed, preventing unexpected null reference issues in downstream logic.Original thread: https://discord.com/channels/333727978460676096/922945034427432980/threads/1346762281161199668
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