[SR-15683] Program crashes when adding many tasks to a TaskGroup on Windows

[MarSe32m]

Previous ID	SR-15683
Radar	None
Original Reporter	@MarSe32m
Type	Bug

Environment

Windows, snapshot: swift-DEVELOPMENT-SNAPSHOT-2021-12-23-a.

Additional Detail from JIRA

Votes	0
Component/s
Labels	Bug, Concurrency, Windows
Assignee	None
Priority	Medium

md5: 33cb31c018b26c413b20c4f4c1356a81

Issue Description:

When adding many tasks to a TaskGroup, the program crashes when waiting for the tasks to finish. This doesn't happen on "relatively low" values of upperBound. For example when upperBound = 2500, the code executes fine to the end and prints "Done: 2500". But when for example upperBound > 10000, the program crashes. I cannot reproduce this behavior on macOS or Linux.

@main
struct App {
    static func main() async {
        let upperBound = 10000
        await withTaskGroup(of: Void.self) { group in 
            for i in 0..<upperBound {
                group.addTask {
                    print(i)
                }
            }
        }
        print("Done:", upperBound)
    }
}

[MarSe32m]

I cannot reproduce this anymore with nightly toolchain. I think the fix that resolved #57976 also resolved this.

[ktoso]

Great to hear, thanks for looping back to let us know 👍