SemaphoreSlim.WaitAsync() begin fire TimeoutException on TaskScheduler.UnobservedTaskException in net6.0? #60856
Description
Description
After upgrade to net6.0-rc2, I begin to see a lot of TimeoutException when do log with TaskScheduler.UnobservedTaskException, and finally found it's create by SemaphoreSlim.WaitAsync().
Seems no actual thing is broken, just bother people use the event handler for log.
Is it by design or an bug in net6.0?
Reproduction Steps
public static async Task Main(string[] args)
{
TaskScheduler.UnobservedTaskException += (s, e) => Console.WriteLine(e.Exception);
var sem = new SemaphoreSlim(0);
for (int i = 0; i < 16; ++i)
{
await sem.WaitAsync(100);
GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced);
}
Console.WriteLine("---END---");
}Expected behavior
No output before ---END---
Actual behavior
System.AggregateException: A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread. (The operation has timed out.)
---> System.TimeoutException: The operation has timed out.
--- End of inner exception stack trace ---Regression?
The same thing work well on net5.0
Known Workarounds
User can filter TimeoutException when do log with TaskScheduler.UnobservedTaskException
Configuration
Which version of .NET is the code running on?
net6.0-rc2
What OS and version, and what distro if applicable?
win10-x64
What is the architecture (x64, x86, ARM, ARM64)?
x64
Do you know whether it is specific to that configuration?
No
If you're using Blazor, which web browser(s) do you see this issue in?
No
Other information
No response