[swift-users] Swift 4 thread sanitizer more sensitive?

[Joe Groff]

> On Jun 26, 2017, at 10:33 AM, Joe Groff via swift-users <swift-users at swift.org> wrote:
> 
> 
>> On Jun 25, 2017, at 3:56 PM, Jon Shier via swift-users <swift-users at swift.org> wrote:
>> 
>> 	Running Alamofire through the thread sanitizer and the thread sanitizer finds issues in Swift 4 mode but not Swift 3.2. Does Swift 4 add additional threading instrumentation that you don’t get under other versions? Or is there some other runtime difference that explains it?
> 
> Would you be able to file bugs for specific issues so we can investigate whether the behavior changes are intentional?

cc'ing Anna, Devin, and Kuba who worked on improving TSan support for Swift.

-Joe