[7.0] Fix reporting of an async IO timeout error on Windows (SerialPort)
#81745
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…ort`) - Port of #81744 - When an async `SerialPort` IO operation times out, it reports the timeout in the IO completion with an `NTSTATUS` value of `WAIT_TIMEOUT` (258) - In the thread pool when using `GetQueuedCompletionStatusEx`, the `NTSTATUS` value was being checked against `STATUS_SUCCESS` to determine success, so the `WAIT_TIMEOUT` was reported as an error. This leads to a different exception being thrown, compared to before when `GetQueuedCompletionStatus` was used. - Fixed to use similar logic to the SDK's `NT_SUCCESS` macro, which treats the `WAIT_TIMEOUT` value as a success, which is similar to what `GetQueuedCompletionStatus` does - There are already tests that verify this behavior in `System.IO.Ports` tests, though [they are currently disabled](https://github.com/dotnet/runtime/blob/b39d6a6eb44860746e91e5ce4f585beff33d1f63/src/libraries/System.IO.Ports/tests/Support/TCSupport.cs#L108-L118) due to instabilities. I have verified locally that the relevant failures are fixed and that there are no new failures in those tests. Relevant to #80079
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Tagging subscribers to this area: @mangod9 Issue Details
Port of fix for #80079
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jeffschwMSFT
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Feb 7, 2023
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approved. we will take for consideration in 7.0.x
rbhanda
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mangod9
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SerialPort) #81744SerialPortIO operation times out, it reports the timeout in the IO completion with anNTSTATUSvalue ofWAIT_TIMEOUT(258)GetQueuedCompletionStatusEx, theNTSTATUSvalue was being checked againstSTATUS_SUCCESSto determine success, so theWAIT_TIMEOUTwas reported as an error. This leads to a different exception being thrown, compared to before whenGetQueuedCompletionStatuswas used.NT_SUCCESSmacro, which treats theWAIT_TIMEOUTvalue as a success, which is similar to whatGetQueuedCompletionStatusdoesSystem.IO.Portstests, though they are currently disabled due to instabilities. I have verified locally that the relevant failures are fixed and that there are no new failures in those tests.Port of fix for #80079
Customer Impact
A
SerialPortIO operation that times out raises anIOExceptioninstead of the documentedTimeoutException. Some customers have reported the issue and that it has broken several apps usingSerialPorton Windows. There is a runtime config option that can be configured to revert the change in behavior, which serves as a workaround. Another workaround is to catch theIOExceptionand check the error code.Regression?
Yes, from 6.0
Testing
Verified with the repro that the behavior is the same as before
Risk
Low. .NET 6 uses
GetQueuedCompletionStatus, and after the change the behavior is closer to whatGetQueuedCompletionStatusdoes.