(lldb) p self (AsyncHTTPClient.HTTPClient) $R8 = 0x0000000100d2d6b0 { eventLoopGroup = 0x0000000113c0efe0 { index = 0x0000000113c076a0 {} eventLoops = 1 value { [0] = 0x0000000113c0b150 { loop = 0x0000000113c11540 { baseOS_dispatch_queue@0 = { baseOS_dispatch_object@0 = { baseOS_object@0 = { baseNSObject@0 = { isa = OS_dispatch_queue_serial } } } } } taskQueue = 0x0000000113d5d290 { baseOS_dispatch_queue@0 = { baseOS_dispatch_object@0 = { baseOS_object@0 = { baseNSObject@0 = { isa = OS_dispatch_queue_serial } } } } } inQueueKey = 0x0000000100cc1c90 {} loopID = {} defaultQoS = { qosClass = <invalid> (0x2) relativePriority = 0 } registeredChannels = 1 key/value pair { [0] = { key = (_value = 0x0000000100d30440) value = 0x0000000100d30440 { allocator = (malloc = 0x0000000111ced770 AsyncHTTPClientTests`@objc closure #1 (Swift.Int) -> Swift.Optional<Swift.UnsafeMutableRawPointer> in NIO.ByteBufferAllocator.init() -> NIO.ByteBufferAllocator at <compiler-generated>, realloc = 0x0000000111ced7e0 AsyncHTTPClientTests`@objc closure #2 (Swift.Optional<Swift.UnsafeMutableRawPointer>, Swift.Int) -> Swift.Optional<Swift.UnsafeMutableRawPointer> in NIO.ByteBufferAllocator.init() -> NIO.ByteBufferAllocator at <compiler-generated>, free = 0x0000000111ced830 AsyncHTTPClientTests`@objc closure #3 (Swift.Optional<Swift.UnsafeMutableRawPointer>) -> () in NIO.ByteBufferAllocator.init() -> NIO.ByteBufferAllocator at <compiler-generated>, memcpy = 0x0000000111ced8a0 AsyncHTTPClientTests`@objc closure #4 (Swift.UnsafeMutableRawPointer, Swift.UnsafeRawPointer, Swift.Int) -> () in NIO.ByteBufferAllocator.init() -> NIO.ByteBufferAllocator at <compiler-generated>) parent = nil tsEventLoop = 0x0000000113c0b150 {...} _pipeline = 0x0000000100d25e20 { head = 0x0000000100d2af50 { next = 0x0000000100d2e2a0 { next = nil prev = 0x0000000100d2af50 {...} pipeline = 0x0000000100d25e20 {...} name = "tail" inboundHandler = 0x0000000100b09fb0 outboundHandler = nil removeHandlerInvoked = false userTriggeredRemovalStarted = false } prev = nil pipeline = 0x0000000100d25e20 {...} name = "head" inboundHandler = nil outboundHandler = 0x0000000100b0a270 removeHandlerInvoked = false userTriggeredRemovalStarted = false } tail = 0x0000000100d2e2a0 {...} idx = 0 destroyed = false eventLoop = 0x0000000113c0b150 {...} _channel = 0x0000000100d30440 {...} } closePromise = { futureResult = 0x0000000100d1da30 { _value = nil eventLoop = 0x0000000113c0b150 {...} _callbacks = { firstCallback = nil furtherCallbacks = nil } } } nwConnection = 0x0000000102debb40 { endpoint = <invalid> (0x6c) parameters = 0x0000000102dd5720 {} } connectionQueue = 0x0000000100d18820 { baseOS_dispatch_queue@0 = { baseOS_dispatch_object@0 = { baseOS_object@0 = { baseNSObject@0 = { isa = OS_dispatch_queue_serial } } } } } connectPromise = nil tcpOptions = 0x0000000100d2d9d0 { Network.NWProtocolOptions = {} } tlsOptions = nil state = inactive isActive0 = 0x0000000100d21200 {} supportedActivationType = connect outstandingRead = false options = (autoRead = true, supportRemoteHalfClosure = false, waitForActivity = true) pendingWrites = { _buffer = { _buffer = { _storage = 8 values { [0] = nil [1] = nil [2] = nil [3] = nil [4] = nil [5] = nil [6] = nil [7] = nil } } } headBackingIndex = 0 tailBackingIndex = 0 } backpressureManager = { writable = 0x0000000100d2f830 {} outstandingBytes = 0 waterMarks = (low = 32768, high = 65536) } reuseAddress = false reusePort = false enablePeerToPeer = false _addressCache = { local = nil remote = nil } _addressCacheLock = 0x0000000100d367b0 (mutex = 0x0000000100d24060) } } } state = closing } } } eventLoopGroupProvider = shared { shared = 0x0000000113c0efe0 {...} } configuration = { tlsConfiguration = nil redirectConfiguration = { configuration = follow { follow = (max = 5, allowCycles = false) } } timeout = { connect = nil read = nil } maximumAllowedIdleTimeInConnectionPool = (nanoseconds = 60000000000) proxy = nil decompression = disabled ignoreUncleanSSLShutdown = false } pool = 0x0000000100d2c220 { configuration = { tlsConfiguration = nil redirectConfiguration = { configuration = follow { follow = (max = 5, allowCycles = false) } } timeout = { connect = nil read = nil } maximumAllowedIdleTimeInConnectionPool = (nanoseconds = 60000000000) proxy = nil decompression = disabled ignoreUncleanSSLShutdown = false } providers = 1 key/value pair { [0] = { key = { scheme = http host = "localhost" port = 59784 unixPath = "" } value = 0x0000000100d3cc60 { configuration = { tlsConfiguration = nil redirectConfiguration = { configuration = follow { follow = (max = 5, allowCycles = false) } } timeout = { connect = nil read = nil } maximumAllowedIdleTimeInConnectionPool = (nanoseconds = 60000000000) proxy = nil decompression = disabled ignoreUncleanSSLShutdown = false } pool = 0x0000000100d2c220 {...} key = { scheme = http host = "localhost" port = 59784 unixPath = "" } eventLoop = 0x0000000113c0b150 {...} lock = 0x0000000100d29780 (mutex = 0x0000000100d1bc60) closePromise = { futureResult = 0x0000000100d33aa0 { _value = success eventLoop = 0x0000000113c0b150 {...} _callbacks = { firstCallback = nil furtherCallbacks = nil } } } state = { maximumConcurrentConnections = 8 eventLoop = 0x0000000113c0b150 {...} state = closed availableConnections = { _buffer = { _buffer = { _storage = 1 value { [0] = nil } } } headBackingIndex = 0 tailBackingIndex = 0 } leasedConnections = 0 values {} waiters = { _buffer = { _buffer = { _storage = 1 value { [0] = nil } } } headBackingIndex = 0 tailBackingIndex = 0 } openedConnectionsCount = 1 pending = 0 } backgroundActivityLogger = { handler = {} label = "AHC-do-not-log" } } } } lock = 0x0000000100d1ed90 (mutex = 0x0000000100d30d90) backgroundActivityLogger = { handler = {} label = "AHC-do-not-log" } } state = shutDown stateLock = 0x0000000100d1cf80 (mutex = 0x0000000100d21480) } 

(lldb) bt all thread #1, queue = 'com.apple.main-thread' frame #0: 0x00007fff70ff455e libsystem_kernel.dylib`__ulock_wait + 10 frame #1: 0x00007fff70e58e29 libdispatch.dylib`_dlock_wait + 44 frame #2: 0x00007fff70e590b7 libdispatch.dylib`_dispatch_group_wait_slow + 43 frame #3: 0x00007fff70e5b1a1 libdispatch.dylib`dispatch_block_wait + 212 frame #4: 0x00007fff709205c2 libswiftDispatch.dylib`Dispatch.DispatchWorkItem.wait() -> () + 34 frame #5: 0x0000000111d6053f AsyncHTTPClientTests`EventLoopGroup.syncShutdownGracefully(self=0x0000000113c0efe0) at EventLoop.swift:762:22 frame #6: 0x0000000111c15f60 AsyncHTTPClientTests`implicit closure #5 in HTTPClientTests.tearDown() at <compiler-generated>:0 frame #7: 0x0000000111c15fd0 AsyncHTTPClientTests`partial apply for implicit closure #5 in HTTPClientTests.tearDown() at <compiler-generated>:0 frame #8: 0x0000000111b97f5f AsyncHTTPClientTests`thunk for @callee_guaranteed () -> (@error @owned Error) at <compiler-generated>:0 frame #9: 0x0000000111c15ff4 AsyncHTTPClientTests`thunk for @callee_guaranteed () -> (@error @owned Error)partial apply at <compiler-generated>:0 frame #10: 0x0000000102f0db66 libXCTestSwiftSupport.dylib`closure #1 () throws -> () in XCTest.XCTAssertNoThrow<A>(_: @autoclosure () throws -> A, _: @autoclosure () -> Swift.String, file: Swift.StaticString, line: Swift.UInt) -> () + 54 frame #11: 0x0000000102f0de15 libXCTestSwiftSupport.dylib`partial apply forwarder for closure #1 () throws -> () in XCTest.XCTAssertNoThrow<A>(_: @autoclosure () throws -> A, _: @autoclosure () -> Swift.String, file: Swift.StaticString, line: Swift.UInt) -> () + 21 frame #12: 0x0000000102f0e0ab libXCTestSwiftSupport.dylib`partial apply forwarder for closure #1 () -> () in XCTest._XCTRunThrowableBlock(() throws -> ()) -> XCTest._XCTThrowableBlockResult + 27 frame #13: 0x0000000102f0e101 libXCTestSwiftSupport.dylib`partial apply forwarder for reabstraction thunk helper from @callee_guaranteed () -> () to @escaping @callee_guaranteed () -> () + 17 frame #14: 0x0000000102f0599e libXCTestSwiftSupport.dylib`reabstraction thunk helper from @escaping @callee_guaranteed () -> () to @callee_unowned @convention(block) () -> () + 14 frame #15: 0x0000000102f01d7a libXCTestSwiftSupport.dylib`_XCTRunThrowableBlockBridge + 42 frame #16: 0x0000000102f057d0 libXCTestSwiftSupport.dylib`XCTest._XCTRunThrowableBlock(() throws -> ()) -> XCTest._XCTThrowableBlockResult + 208 frame #17: 0x0000000102f0d6b6 libXCTestSwiftSupport.dylib`XCTest.XCTAssertNoThrow<A>(_: @autoclosure () throws -> A, _: @autoclosure () -> Swift.String, file: Swift.StaticString, line: Swift.UInt) -> () + 70 frame #18: 0x0000000111c15734 AsyncHTTPClientTests`HTTPClientTests.tearDown(self=0x0000000113d19970) at HTTPClientTests.swift:73:9 frame #19: 0x0000000111c1639b AsyncHTTPClientTests`@objc HTTPClientTests.tearDown() at <compiler-generated>:0 frame #20: 0x000000010039a3b0 XCTest`-[XCTestCase(XCTIssueHandling) _caughtUnhandledDeveloperExceptionPermittingControlFlowInterruptions:caughtInterruptionException:whileExecutingBlock:] + 179 frame #21: 0x00000001003277ed XCTest`__51-[XCTestCase _performTearDownSequenceWithSelector:]_block_invoke + 131 frame #22: 0x00000001003aacc0 XCTest`-[XCTContext _runActivityNamed:type:block:] + 301 frame #23: 0x000000010033015e XCTest`-[XCTestCase startActivityWithTitle:type:block:] + 186 frame #24: 0x0000000100330290 XCTest`-[XCTestCase startActivityWithTitle:block:] + 60 frame #25: 0x0000000100326749 XCTest`-[XCTestCase _performTearDownSequenceWithSelector:] + 86 frame #26: 0x0000000100325984 XCTest`-[XCTestCase invokeTest] + 1208 frame #27: 0x00000001003272b2 XCTest`__26-[XCTestCase performTest:]_block_invoke_2 + 43 frame #28: 0x000000010039a3b0 XCTest`-[XCTestCase(XCTIssueHandling) _caughtUnhandledDeveloperExceptionPermittingControlFlowInterruptions:caughtInterruptionException:whileExecutingBlock:] + 179 frame #29: 0x00000001003271e9 XCTest`__26-[XCTestCase performTest:]_block_invoke.362 + 86 frame #30: 0x00000001003ab31d XCTest`+[XCTContext runInContextForTestCase:block:] + 211 frame #31: 0x0000000100326a56 XCTest`-[XCTestCase performTest:] + 690 frame #32: 0x000000010037848a XCTest`-[XCTest runTest] + 57 frame #33: 0x00000001003202dd XCTest`__27-[XCTestSuite performTest:]_block_invoke + 329 frame #34: 0x000000010031fafe XCTest`__59-[XCTestSuite _performProtectedSectionForTest:testSection:]_block_invoke + 24 frame #35: 0x00000001003ab31d XCTest`+[XCTContext runInContextForTestCase:block:] + 211 frame #36: 0x000000010031fab5 XCTest`-[XCTestSuite _performProtectedSectionForTest:testSection:] + 148 frame #37: 0x000000010031fdb9 XCTest`-[XCTestSuite performTest:] + 290 frame #38: 0x000000010037848a XCTest`-[XCTest runTest] + 57 frame #39: 0x00000001003202dd XCTest`__27-[XCTestSuite performTest:]_block_invoke + 329 frame #40: 0x000000010031fafe XCTest`__59-[XCTestSuite _performProtectedSectionForTest:testSection:]_block_invoke + 24 frame #41: 0x00000001003ab31d XCTest`+[XCTContext runInContextForTestCase:block:] + 211 frame #42: 0x000000010031fab5 XCTest`-[XCTestSuite _performProtectedSectionForTest:testSection:] + 148 frame #43: 0x000000010031fdb9 XCTest`-[XCTestSuite performTest:] + 290 frame #44: 0x000000010037848a XCTest`-[XCTest runTest] + 57 frame #45: 0x00000001003202dd XCTest`__27-[XCTestSuite performTest:]_block_invoke + 329 frame #46: 0x000000010031fafe XCTest`__59-[XCTestSuite _performProtectedSectionForTest:testSection:]_block_invoke + 24 frame #47: 0x00000001003ab31d XCTest`+[XCTContext runInContextForTestCase:block:] + 211 frame #48: 0x000000010031fab5 XCTest`-[XCTestSuite _performProtectedSectionForTest:testSection:] + 148 frame #49: 0x000000010031fdb9 XCTest`-[XCTestSuite performTest:] + 290 frame #50: 0x000000010037848a XCTest`-[XCTest runTest] + 57 frame #51: 0x00000001003c76e2 XCTest`__44-[XCTTestRunSession runTestsAndReturnError:]_block_invoke_2 + 148 frame #52: 0x00000001003ab31d XCTest`+[XCTContext runInContextForTestCase:block:] + 211 frame #53: 0x00000001003c7647 XCTest`__44-[XCTTestRunSession runTestsAndReturnError:]_block_invoke + 111 frame #54: 0x00000001003c77c8 XCTest`__44-[XCTTestRunSession runTestsAndReturnError:]_block_invoke.95 + 96 frame #55: 0x0000000100346cc8 XCTest`-[XCTestObservationCenter _observeTestExecutionForBlock:] + 325 frame #56: 0x00000001003c740d XCTest`-[XCTTestRunSession runTestsAndReturnError:] + 615 frame #57: 0x0000000100303ea2 XCTest`-[XCTestDriver _runTests] + 466 frame #58: 0x00000001003a74c1 XCTest`_XCTestMain + 108 frame #59: 0x0000000100002ef7 xctest`main + 210 frame #60: 0x00007fff70eb1cc9 libdyld.dylib`start + 1 frame #61: 0x00007fff70eb1cc9 libdyld.dylib`start + 1 thread #10 frame #0: 0x00007fff70ff44ce libsystem_kernel.dylib`__workq_kernreturn + 10 frame #1: 0x00007fff710b2aa1 libsystem_pthread.dylib`_pthread_wqthread + 390 frame #2: 0x00007fff710b1b77 libsystem_pthread.dylib`start_wqthread + 15 * thread #11, queue = 'nio.transportservices.eventloop.taskqueue', stop reason = Assertion failed frame #0: 0x00007fff707cd380 libswiftCore.dylib`_swift_runtime_on_report frame #1: 0x00007fff70847243 libswiftCore.dylib`_swift_stdlib_reportFatalErrorInFile + 211 frame #2: 0x00007fff7050e9de libswiftCore.dylib`closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in Swift._assertionFailure(_: Swift.StaticString, _: Swift.String, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never + 286 frame #3: 0x00007fff7050e5e7 libswiftCore.dylib`closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in Swift._assertionFailure(_: Swift.StaticString, _: Swift.String, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never + 87 frame #4: 0x00007fff7050ec21 libswiftCore.dylib`function signature specialization <Arg[1] = [Closure Propagated : closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in closure #1 (Swift.UnsafeBufferPointer<Swift.UInt8>) -> () in Swift._assertionFailure(_: Swift.StaticString, _: Swift.String, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never, Argument Types : [Swift.StaticStringSwift.UnsafeBufferPointer<Swift.UInt8>Swift.UIntSwift.UInt32]> of generic specialization <()> of Swift.String.withUTF8<A>((Swift.UnsafeBufferPointer<Swift.UInt8>) throws -> A) throws -> A + 257 frame #5: 0x00007fff7050d1c0 libswiftCore.dylib`Swift._assertionFailure(_: Swift.StaticString, _: Swift.String, file: Swift.StaticString, line: Swift.UInt, flags: Swift.UInt32) -> Swift.Never + 528 * frame #6: 0x00000001121e4cf5 AsyncHTTPClientTests`HTTPClient.deinit(self=0x0000000100d2d6b0) at HTTPClient.swift:117:9 frame #7: 0x00000001121e4f39 AsyncHTTPClientTests`HTTPClient.__deallocating_deinit(self=0x0000000100d2d6b0) at HTTPClient.swift:0 frame #8: 0x00007fff707cf1f0 libswiftCore.dylib`_swift_release_dealloc + 16 frame #9: 0x00000001121f86dd AsyncHTTPClientTests`___lldb_unnamed_symbol1270$$AsyncHTTPClientTests + 29 frame #10: 0x00007fff707cf1f0 libswiftCore.dylib`_swift_release_dealloc + 16 frame #11: 0x00000001121f79eb AsyncHTTPClientTests`___lldb_unnamed_symbol1267$$AsyncHTTPClientTests + 1563 frame #12: 0x00007fff707cf1f0 libswiftCore.dylib`_swift_release_dealloc + 16 frame #13: 0x00000001121f8235 AsyncHTTPClientTests`___lldb_unnamed_symbol1268$$AsyncHTTPClientTests + 21 frame #14: 0x00007fff707cf1f0 libswiftCore.dylib`_swift_release_dealloc + 16 frame #15: 0x0000000111d74daa AsyncHTTPClientTests`___lldb_unnamed_symbol731$$AsyncHTTPClientTests + 42 frame #16: 0x00007fff707cf1f0 libswiftCore.dylib`_swift_release_dealloc + 16 frame #17: 0x0000000111d6923b AsyncHTTPClientTests`outlined consume of Swift.Optional<@escaping @callee_guaranteed () -> (@owned NIO.CallbackList)> + 27 frame #18: 0x0000000111d6b7a8 AsyncHTTPClientTests`EventLoopPromise._resolve(value=failure, self=NIO.EventLoopPromise<AsyncHTTPClient.Connection> @ 0x0000700007cba028) at EventLoopFuture.swift:227:9 frame #19: 0x0000000111d6ba75 AsyncHTTPClientTests`EventLoopPromise.fail(error=ioOnClosedChannel, self=NIO.EventLoopPromise<AsyncHTTPClient.Connection> @ 0x0000700007cba0c8) at EventLoopFuture.swift:180:14 frame #20: 0x00000001121cbd3a AsyncHTTPClientTests`HTTP1ConnectionProvider.connect(result=failure, waiter=AsyncHTTPClient.HTTP1ConnectionProvider.Waiter @ 0x0000000100d35e68, closedConnection=nil, logger=Logging.Logger @ 0x0000000100d35e98, self=0x0000000100d3cc60) at ConnectionPool.swift:438:28 frame #21: 0x00000001121c8e4a AsyncHTTPClientTests`closure #2 in HTTP1ConnectionProvider.execute(result=failure, self=0x0000000100d3cc60, waiter=AsyncHTTPClient.HTTP1ConnectionProvider.Waiter @ 0x0000000100d35e68, logger=Logging.Logger @ 0x0000000100d35e98) at ConnectionPool.swift:340:22 frame #22: 0x00000001121c8cf1 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed (@guaranteed Result<Channel, Error>) -> () at <compiler-generated>:0 frame #23: 0x0000000111d7266f AsyncHTTPClientTests`closure #1 in EventLoopFuture.whenComplete(callback=0x00000001121d2b80 AsyncHTTPClientTests`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@guaranteed Swift.Result<NIO.Channel, Swift.Error>) -> () to @escaping @callee_guaranteed (@in_guaranteed Swift.Result<NIO.Channel, Swift.Error>) -> () at <compiler-generated>, self=0x0000000100d3cfc0) at EventLoopFuture.swift:738:13 frame #24: 0x0000000111d698c0 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed () -> (@owned CallbackList) at <compiler-generated>:0 frame #25: 0x0000000111d6a5d1 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed () -> (@owned CallbackList)partial apply at <compiler-generated>:0 frame #26: 0x0000000111d6b013 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed () -> (@out CallbackList) at <compiler-generated>:0 frame #27: 0x0000000111d6af37 AsyncHTTPClientTests`CallbackList._run(self=NIO.CallbackList @ 0x0000700007cbaa50) at EventLoopFuture.swift:107:28 frame #28: 0x0000000111d6b795 AsyncHTTPClientTests`EventLoopPromise._resolve(value=failure, self=NIO.EventLoopPromise<()> @ 0x0000700007cbab68) at EventLoopFuture.swift:226:42 frame #29: 0x0000000111d6ba75 AsyncHTTPClientTests`EventLoopPromise.fail(error=ioOnClosedChannel, self=NIO.EventLoopPromise<()> @ 0x0000700007cbac08) at EventLoopFuture.swift:180:14 frame #30: 0x0000000112189c54 AsyncHTTPClientTests`NIOTSConnectionChannel.doClose0(error=ioOnClosedChannel, self=0x0000000100d30440) at NIOTSConnectionChannel.swift:574:28 frame #31: 0x000000011218b229 AsyncHTTPClientTests`protocol witness for StateManagedChannel.doClose0(error:) in conformance NIOTSConnectionChannel at <compiler-generated>:0 frame #32: 0x00000001121adae2 AsyncHTTPClientTests`StateManagedChannel.close0(error=ioOnClosedChannel, mode=all, promise=nil, self=0x0000000100d30440) at StateManagedChannel.swift:206:18 frame #33: 0x000000011218b3b8 AsyncHTTPClientTests`protocol witness for ChannelCore.close0(error:mode:promise:) in conformance NIOTSConnectionChannel at <compiler-generated>:0 frame #34: 0x0000000111d224b8 AsyncHTTPClientTests`HeadChannelHandler.close(context=0x0000000100d2af50, mode=all, promise=nil, self=0x0000000100b0a270) at ChannelPipeline.swift:970:38 frame #35: 0x0000000111d227ed AsyncHTTPClientTests`protocol witness for _ChannelOutboundHandler.close(context:mode:promise:) in conformance HeadChannelHandler at <compiler-generated>:0 frame #36: 0x0000000111d1e45f AsyncHTTPClientTests`ChannelHandlerContext.invokeClose(mode=all, promise=nil, self=0x0000000100d2af50) at ChannelPipeline.swift:1460:29 frame #37: 0x0000000111d1c34c AsyncHTTPClientTests`ChannelPipeline.close0(mode=all, promise=nil, self=0x0000000100d25e20) at ChannelPipeline.swift:737:30 frame #38: 0x0000000111d1c17c AsyncHTTPClientTests`ChannelPipeline.close(mode=all, promise=nil, self=0x0000000100d25e20) at ChannelPipeline.swift:637:13 frame #39: 0x0000000111d07d1b AsyncHTTPClientTests`Channel.close(mode=all, promise=nil, self=0x0000000100d30440) at Channel.swift:209:18 frame #40: 0x0000000112192921 AsyncHTTPClientTests`closure #1 in closure #1 in NIOTSEventLoop.closeGently(channel=0x0000000100d30440) at NIOTSEventLoop.swift:185:25 frame #41: 0x0000000112192c3d AsyncHTTPClientTests`thunk for @callee_guaranteed (@unowned ObjectIdentifier, @guaranteed Channel) -> (@owned EventLoopFuture<()>, @error @owned Error) at <compiler-generated>:0 frame #42: 0x0000000112192c94 AsyncHTTPClientTests`partial apply for thunk for @callee_guaranteed (@unowned ObjectIdentifier, @guaranteed Channel) -> (@owned EventLoopFuture<()>, @error @owned Error) at <compiler-generated>:0 frame #43: 0x00007fff704ed505 libswiftCore.dylib`(extension in Swift):Swift.Collection.map<A>((A.Element) throws -> A1) throws -> Swift.Array<A1> + 757 frame #44: 0x000000011219242b AsyncHTTPClientTests`closure #1 in NIOTSEventLoop.closeGently(self=0x0000000113c0b150, p=NIO.EventLoopPromise<Swift.Void> @ 0x0000700007cbb7d0) at NIOTSEventLoop.swift:184:76 frame #45: 0x000000011218fd60 AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed () -> () at <compiler-generated>:0 frame #46: 0x00007fff70e576c4 libdispatch.dylib`_dispatch_call_block_and_release + 12 frame #47: 0x00007fff70e58658 libdispatch.dylib`_dispatch_client_callout + 8 frame #48: 0x00007fff70e5dc44 libdispatch.dylib`_dispatch_lane_serial_drain + 597 frame #49: 0x00007fff70e5e609 libdispatch.dylib`_dispatch_lane_invoke + 414 frame #50: 0x00007fff70e5daf6 libdispatch.dylib`_dispatch_lane_serial_drain + 263 frame #51: 0x00007fff70e5e609 libdispatch.dylib`_dispatch_lane_invoke + 414 frame #52: 0x00007fff70e67c09 libdispatch.dylib`_dispatch_workloop_worker_thread + 596 frame #53: 0x00007fff710b2a3d libsystem_pthread.dylib`_pthread_wqthread + 290 frame #54: 0x00007fff710b1b77 libsystem_pthread.dylib`start_wqthread + 15 thread #12, queue = 'com.apple.network.connections' frame #0: 0x00007fff70ff2dfa libsystem_kernel.dylib`mach_msg_trap + 10 frame #1: 0x00007fff70ff3170 libsystem_kernel.dylib`mach_msg + 60 frame #2: 0x00007fff710fd012 libxpc.dylib`_xpc_send_serializer + 96 frame #3: 0x00007fff71101f58 libxpc.dylib`_xpc_pipe_simpleroutine + 79 frame #4: 0x00007fff710fcf9a libxpc.dylib`xpc_pipe_simpleroutine + 42 frame #5: 0x00007fff710d9a2b libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke + 29 frame #6: 0x00007fff70e58658 libdispatch.dylib`_dispatch_client_callout + 8 frame #7: 0x00007fff70e5ad79 libdispatch.dylib`_dispatch_block_invoke_direct + 245 frame #8: 0x00007fff70e5ac79 libdispatch.dylib`dispatch_block_perform + 124 frame #9: 0x00007fff710d94d7 libsystem_trace.dylib`_os_activity_stream_reflect + 530 frame #10: 0x00007fff710dd04e libsystem_trace.dylib`_os_log_impl_stream + 535 frame #11: 0x00007fff710d184b libsystem_trace.dylib`_os_log_impl_flatten_and_send + 8502 frame #12: 0x00007fff710d54b9 libsystem_trace.dylib`os_log_pack_send + 52 frame #13: 0x00007fff6f8e32b1 libnetwork.dylib`nw_connection_log_event_summary_on_nw_queue + 433 frame #14: 0x00007fff6f8e2f4e libnetwork.dylib`nw_connection_log_summary_on_nw_queue + 13790 frame #15: 0x00007fff6f8df7ad libnetwork.dylib`nw_connection_send_stats_report_on_nw_queue + 2989 frame #16: 0x00007fff6f8de0e8 libnetwork.dylib`__nw_connection_cancel_inner_block_invoke + 744 frame #17: 0x00007fff70e576c4 libdispatch.dylib`_dispatch_call_block_and_release + 12 frame #18: 0x00007fff70e58658 libdispatch.dylib`_dispatch_client_callout + 8 frame #19: 0x00007fff70e5f909 libdispatch.dylib`_dispatch_workloop_invoke + 2161 frame #20: 0x00007fff70e67c09 libdispatch.dylib`_dispatch_workloop_worker_thread + 596 frame #21: 0x00007fff710b2a3d libsystem_pthread.dylib`_pthread_wqthread + 290 frame #22: 0x00007fff710b1b77 libsystem_pthread.dylib`start_wqthread + 15 thread #13 frame #0: 0x00007fff710b1b68 libsystem_pthread.dylib`start_wqthread thread #14 frame #0: 0x0000000000000000 thread #15, name = 'NIO-ELT-201-#0' frame #0: 0x00007fff70ff7766 libsystem_kernel.dylib`kevent + 10 frame #1: 0x0000000111e2e889 AsyncHTTPClientTests`@nonobjc kevent(_:_:_:_:_:_:) at <compiler-generated>:0 frame #2: 0x0000000111e37068 AsyncHTTPClientTests`closure #1 in static KQueue.kevent(kq=9, changelist=nil, nchanges=0, eventlist=0x0000000101822000, nevents=64, timeout=nil) at System.swift:545:13 frame #3: 0x0000000111e305e3 AsyncHTTPClientTests`thunk for @callee_guaranteed () -> (@unowned Int32, @error @owned Error) at <compiler-generated>:0 frame #4: 0x0000000111e370d4 AsyncHTTPClientTests`thunk for @callee_guaranteed () -> (@unowned Int32, @error @owned Error)partial apply at <compiler-generated>:0 frame #5: 0x0000000111e2efef AsyncHTTPClientTests`syscall<T>(blocking=false, function="kevent(kq:changelist:nchanges:eventlist:nevents:timeout:)", body=0x0000000111e370c0 AsyncHTTPClientTests`reabstraction thunk helper from @callee_guaranteed () -> (@unowned Swift.Int32, @error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out Swift.Int32, @error @owned Swift.Error)partial apply forwarder with unmangled suffix ".29" at <compiler-generated>) at System.swift:127:23 frame #6: 0x0000000111e36eda AsyncHTTPClientTests`static KQueue.kevent(kq=9, changelist=nil, nchanges=0, eventlist=0x0000000101822000, nevents=64, timeout=nil, self=NIO.KQueue) at System.swift:544:20 frame #7: 0x0000000111e002c7 AsyncHTTPClientTests`closure #1 in Selector.whenReady(ts=nil, self=0x0000000113d51470) at Selector.swift:518:28 frame #8: 0x0000000111e0311f AsyncHTTPClientTests`partial apply for closure #1 in Selector.whenReady(strategy:_:) at <compiler-generated>:0 frame #9: 0x0000000111e003c3 AsyncHTTPClientTests`thunk for @callee_guaranteed (@unowned UnsafePointer<timespec>?) -> (@unowned Int, @error @owned Error) at <compiler-generated>:0 frame #10: 0x0000000111e03144 AsyncHTTPClientTests`partial apply for thunk for @callee_guaranteed (@unowned UnsafePointer<timespec>?) -> (@unowned Int, @error @owned Error) at <compiler-generated>:0 frame #11: 0x0000000111ded487 AsyncHTTPClientTests`Optional.withUnsafeOptionalPointer<Wrapped>(body=0x0000000111e03130 AsyncHTTPClientTests`partial apply forwarder for reabstraction thunk helper from @callee_guaranteed (@unowned Swift.Optional<Swift.UnsafePointer<__C.timespec>>) -> (@unowned Swift.Int, @error @owned Swift.Error) to @escaping @callee_guaranteed (@unowned Swift.Optional<Swift.UnsafePointer<__C.timespec>>) -> (@out Swift.Int, @error @owned Swift.Error) at <compiler-generated>, self=nil) at Selector.swift:39:24 frame #12: 0x0000000111dfdec5 AsyncHTTPClientTests`Selector.whenReady(strategy=block, body=0x0000000111debce0 AsyncHTTPClientTests`partial apply forwarder for reabstraction thunk helper from @callee_guaranteed (@guaranteed NIO.SelectorEvent<NIO.NIORegistration>) -> (@error @owned Swift.Error) to @escaping @callee_guaranteed (@in_guaranteed NIO.SelectorEvent<NIO.NIORegistration>) -> (@error @owned Swift.Error) at <compiler-generated>, self=0x0000000113d51470) at Selector.swift:517:34 frame #13: 0x0000000111de79ea AsyncHTTPClientTests`closure #2 in SelectableEventLoop.run(self=0x0000000113d56b80, nextReadyTask=nil) at SelectableEventLoop.swift:395:36 frame #14: 0x0000000111deba74 AsyncHTTPClientTests`partial apply for closure #2 in SelectableEventLoop.run() at <compiler-generated>:0 frame #15: 0x0000000111cb621f AsyncHTTPClientTests`thunk for @callee_guaranteed () -> (@error @owned Error) at <compiler-generated>:0 frame #16: 0x0000000111deba94 AsyncHTTPClientTests`thunk for @callee_guaranteed () -> (@error @owned Error)partial apply at <compiler-generated>:0 frame #17: 0x0000000111de1c13 AsyncHTTPClientTests`closure #1 in withAutoReleasePool<T>(execute=0x0000000111deba80 AsyncHTTPClientTests`reabstraction thunk helper from @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error)partial apply forwarder with unmangled suffix ".8" at <compiler-generated>) at SelectableEventLoop.swift:23:13 frame #18: 0x0000000111de1c6f AsyncHTTPClientTests`partial apply for closure #1 in withAutoReleasePool<A>(_:) at <compiler-generated>:0 frame #19: 0x00007fff70b65d8e libswiftObjectiveC.dylib`ObjectiveC.autoreleasepool<A>(invoking: () throws -> A) throws -> A + 46 frame #20: 0x0000000111de1baa AsyncHTTPClientTests`withAutoReleasePool<T>(execute=0x0000000111deba80 AsyncHTTPClientTests`reabstraction thunk helper from @callee_guaranteed () -> (@error @owned Swift.Error) to @escaping @callee_guaranteed () -> (@out (), @error @owned Swift.Error)partial apply forwarder with unmangled suffix ".8" at <compiler-generated>) at SelectableEventLoop.swift:22:16 frame #21: 0x0000000111de65db AsyncHTTPClientTests`SelectableEventLoop.run(self=0x0000000113d56b80) at SelectableEventLoop.swift:394:17 frame #22: 0x0000000111d61396 AsyncHTTPClientTests`static MultiThreadedEventLoopGroup.runTheLoop(thread=0x0000000113d547d0, canEventLoopBeShutdownIndividually=false, selectorFactory=0x0000000111d61f60 AsyncHTTPClientTests`implicit closure #1 () throws -> NIO.Selector<NIO.NIORegistration> in NIO.MultiThreadedEventLoopGroup.init(numberOfThreads: Swift.Int) -> NIO.MultiThreadedEventLoopGroup at EventLoop.swift, initializer=0x0000000111d69130 AsyncHTTPClientTests`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@in_guaranteed NIO.NIOThread) -> (@out ()) to @escaping @callee_guaranteed (@guaranteed NIO.NIOThread) -> () at <compiler-generated>, callback=0x0000000111d66d80 AsyncHTTPClientTests`partial apply forwarder for closure #1 (NIO.SelectableEventLoop) -> () in closure #1 (NIO.NIOThread) -> () in static NIO.MultiThreadedEventLoopGroup.(setupThreadAndEventLoop in _D5D78C61B22284700B9BD1ACFBC25157)(name: Swift.String, selectorFactory: () throws -> NIO.Selector<NIO.NIORegistration>, initializer: (NIO.NIOThread) -> ()) -> NIO.SelectableEventLoop at <compiler-generated>, self=NIO.MultiThreadedEventLoopGroup) at EventLoop.swift:822:22 frame #23: 0x0000000111d61ba4 AsyncHTTPClientTests`closure #1 in static MultiThreadedEventLoopGroup.setupThreadAndEventLoop(t=0x0000000113d547d0, selectorFactory=0x0000000111d61f60 AsyncHTTPClientTests`implicit closure #1 () throws -> NIO.Selector<NIO.NIORegistration> in NIO.MultiThreadedEventLoopGroup.init(numberOfThreads: Swift.Int) -> NIO.MultiThreadedEventLoopGroup at EventLoop.swift, initializer=0x0000000111d69130 AsyncHTTPClientTests`partial apply forwarder for reabstraction thunk helper from @escaping @callee_guaranteed (@in_guaranteed NIO.NIOThread) -> (@out ()) to @escaping @callee_guaranteed (@guaranteed NIO.NIOThread) -> () at <compiler-generated>, lock=(mutex = 0x0000000113d3ed60), _loop=0x0000000113d56b80, loopUpAndRunningGroup=0x0000000100cfb0c0) at EventLoop.swift:842:41 frame #24: 0x0000000111d66cf3 AsyncHTTPClientTests`partial apply for closure #1 in static MultiThreadedEventLoopGroup.setupThreadAndEventLoop(name:selectorFactory:initializer:) at <compiler-generated>:0 frame #25: 0x0000000111d6224f AsyncHTTPClientTests`thunk for @escaping @callee_guaranteed (@guaranteed NIOThread) -> () at <compiler-generated>:0 frame #26: 0x0000000111e37841 AsyncHTTPClientTests`partial apply for thunk for @escaping @callee_guaranteed (@guaranteed NIOThread) -> () at <compiler-generated>:0 frame #27: 0x0000000111e3e4ce AsyncHTTPClientTests`closure #1 in static ThreadOpsPosix.run($0=(_rawValue = 0x0000000113d507d0 -> 0x00007fff97558d58 libswiftCore.dylib`InitialAllocationPool + 51320)) at ThreadPosix.swift:105:13 frame #28: 0x0000000111e3e609 AsyncHTTPClientTests`@objc closure #1 in static ThreadOpsPosix.run(handle:args:detachThread:) at <compiler-generated>:0 frame #29: 0x00007fff710b6109 libsystem_pthread.dylib`_pthread_start + 148 frame #30: 0x00007fff710b1b8b libsystem_pthread.dylib`thread_start + 15