[SR-15444] Many Thread Sanitizer False Positives In Async Tests

[jshier]

Previous ID	SR-15444
Radar	None
Original Reporter	@jshier
Type	Bug

Environment

macOS 12.0.1, Xcode 13.2 and earlier

Additional Detail from JIRA

Votes	3
Component/s
Labels	Bug
Assignee	None
Priority	Medium

md5: b9dd798cda38c29ad9fb5e5d9c79d2ba

Issue Description:

On Alamofire's feature/async-handlers branch (Xcode 13.2 required), running more than one of the new async tests at once causes multiple thread sanitizer warnings. Running the entire DataConcurrencyTests suite of ten tests causes 46 issues. I've put them in this gist: https://gist.github.com/jshier/8c9c7190e1166c28df567fe869355e49

To run Alamofire's tests you'll also need to install and run our test server (brew install alamofire/alamofire/firewalk && firewall &).

[finestructure]

We're also starting to see TSAN warnings are we're moving our Vapor code base to async/await in the [Swift Package Index|https://swiftpackage.index.com/)] - but only when running them on Linux. On macOS everything passes without any warnings.

We have docs up on how to run our test suite in Docker but I can also provide some details on how to run a reproducible case for this specifically if needed.

[0xTim]

@tomerd ☝️

[jshier]

This seems fixed on macOS in Xcode 14, last I checked.