Hello, you could use this tool to search for the static library that contains the symbol https://github.com/Wooder/ios_17_required_reason_api_scanner If you want to know which specific object file contains it, you could unarchive the static library using: ar -x library.a

I had the same issue, the method read(upToCount:) was growing the memory usage, as suggested the autoreleasepool solved the issue, you could rewrite it like this: func readFullFile(filePath: String) throws {     let blockSize = 32 * 1024     guard let file = FileHandle(forReadingAtPath: filePath) else {         fatalError("Failed to open file")     }     while (true) {         var data: Data?         try autoreleasepool {             data = try file.read(upToCount: blockSize)         }         guard let data = data else {            break         }     } }

Also happening in Xcode 13.1 running in iOS 15.0 simulators, 20% of our tests failed because of this, reported in FB9794773 Looking at the xcresult logs I found this info but not too helpful: 18:02:04.554 Xcode[72384:6322690] 8D4BD7E8-6674-461B-9079-C12C459B0530: Launching app with identifier: com.some.identifier and options: { .... // OMITED BECAUSE IT'S TOO LARGE } 18:02:04.723 Xcode[72384:6322689] 8D4BD7E8-6674-461B-9079-C12C459B0530: Launched app with identifier: com.some.identifier (pid = 80902) 18:02:04.724 Xcode[72384:6322689] 📱<DVTiPhoneSimulator (0x14be19470), iPhone 8 Plus, unknown class, 15.0 (19A339), 8D4BD7E8-6674-461B-9079-C12C459B0530> tracking pid 80902 18:02:04.724 Xcode[72384:6322689] 📱<DVTiPhoneSimulator (0x14be19470), iPhone 8 Plus, unknown class, 15.0 (19A339), 8D4BD7E8-6674-461B-9079-C12C459B0530> checking to see if pid 80902 is valid: kill(pid, 0) = 0 (YES, it's still running) 18:02:04.732 Xcode[72384:5738902] Test process runnable PID is 80902. 18:02:04.732 Xcode[72384:6322621] XCTHTestOperationStateMachine: Transitioning from state Initial to AcquiredPID 18:07:34.729 Xcode[72384:6327051] XCTHTestOperationStateMachine: Startup timer fired; the test runner has not made forward progress for 300.00 seconds 18:07:34.730 Xcode[72384:6327051] XCTHTestOperationStateMachine: Transitioning from state AcquiredPID to BootstrappingHang 18:07:34.730 Xcode[72384:5738902] Acquiring spindump to help determine why test runner got stuck after launching 18:07:39.927 Xcode[72384:5738902] Retrieved spindump data of 3394 bytes 18:07:39.927 Xcode[72384:5738902] Test operation failure: Test runner never began executing tests after launching 18:07:39.934 Xcode[72384:5738902] _finishWithError:Error Domain=XCTHTestOperationCoordinatorErrorDomain Code=14 "Test runner never began executing tests after launching" UserInfo={NSLocalizedDescription=Test runner never began executing tests after launching} Maybe there is a way to increment the startup timeout (300s) from Test Runner?