[release/6.0] Fix UnobservedTaskException from SemaphoreSlim.WaitAsync #61491
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If a SemaphoreSlim.WaitAsync times out, it correctly returns false, but it also results in TaskScheduler.UnobservedTaskException being raised unexpectedly, due to internal use of a faulted task whose exception isn't observed. This fixes that by marking any such exceptions as having been observed.
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Tagging subscribers to this area: @mangod9 Issue DetailsBackport of #60890 to release/6.0 /cc @stephentoub Customer ImpactTestingRisk
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adamsitnik
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Nov 12, 2021
danmoseley
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Backport of #60890 to release/6.0
/cc @stephentoub
Customer Impact
If a developer uses SemaphoreSlim.WaitAsync with a timeout and it times out, the TaskScheduler.UnobservedTaskException event will erroneously be raised with a TimeoutException due to the exception that gets generated internally. This ends up being noise in an event devs typically use to know when something they're supposed to have handled has gone unhandled.
Testing
Manual testing plus a new unit test.
Risk
Low.