到目前为止，我已经花了几天时间试图追查这个问题，但没有运气。
我正在尝试测量我的项目中的测试覆盖率，这是一个使用 Xcode 在 Objective-C 中开发的 Mac OS 应用程序，这意味着在构建设置中启用“仪器程序流程”和“生成测试覆盖率文件”。我相信这些对应于clang中的-fprofile-arcs和-ftest-coverage标志。
当这些被启用时（虽然它似乎只-fprofile-arcs影响这个问题）程序将在某些地方崩溃并出现EXC_BAD_ACCESS异常。objc_msgSend
在运行应用程序本身时，会在返回第一个网络请求时发生这种情况。回溯不包含我的任何代码，并且似乎完全发生在 Foundation/Cocoa 框架中。虽然这很烦人，但我忍受了根据我是在运行测试还是使用应用程序来打开/关闭构建设置。
我现在在测试时遇到了似乎相同的问题。我刚刚编写了一个包含网络访问的测试，并且在检测程序流时，测试失败，并且在同一位置出现明显相同的异常。
我需要弄清楚是什么原因造成的。我正在开发的应用程序是针对大学项目的，其中一个目标是报告测试覆盖率并评估测试过程。当由于测试崩溃而无法测试应用程序的大部分时，这很难做到。
* thread #1: tid = 0x2203, 0x00007fff8ffb6250 libobjc.A.dylib`objc_msgSend + 16, stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
frame #0: 0x00007fff8ffb6250 libobjc.A.dylib`objc_msgSend + 16
frame #1: 0x00007fff88ffe708 Foundation`___NSURLConnectionWillCacheResponse_block_invoke_0 + 110
frame #2: 0x00007fff88e86528 Foundation`__65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke_0 + 28
frame #3: 0x00007fff88e8646c Foundation`-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 227
frame #4: 0x00007fff88e86368 Foundation`-[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 63
frame #5: 0x00007fff88ffda3c Foundation`_NSURLConnectionWillCacheResponse + 126
frame #6: 0x00007fff879f8272 CFNetwork`___delegate_willCacheResponse_block_invoke_0 + 48
frame #7: 0x00007fff87a75a7a CFNetwork`___withDelegateAsync_block_invoke_0 + 90
frame #8: 0x00007fff87b062ea CFNetwork`__block_global_1 + 28
frame #9: 0x00007fff90110154 CoreFoundation`CFArrayApplyFunction + 68
frame #10: 0x00007fff87a667e4 CFNetwork`RunloopBlockContext::perform() + 124
frame #11: 0x00007fff87a666bb CFNetwork`MultiplexerSource::perform() + 221
frame #12: 0x00007fff900f1b31 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
frame #13: 0x00007fff900f1455 CoreFoundation`__CFRunLoopDoSources0 + 245
frame #14: 0x00007fff901147f5 CoreFoundation`__CFRunLoopRun + 789
frame #15: 0x00007fff901140e2 CoreFoundation`CFRunLoopRunSpecific + 290
frame #16: 0x00007fff8a660eb4 HIToolbox`RunCurrentEventLoopInMode + 209
frame #17: 0x00007fff8a660c52 HIToolbox`ReceiveNextEventCommon + 356
frame #18: 0x00007fff8a660ae3 HIToolbox`BlockUntilNextEventMatchingListInMode + 62
frame #19: 0x00007fff92804563 AppKit`_DPSNextEvent + 685
frame #20: 0x00007fff92803e22 AppKit`-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
frame #21: 0x00007fff927fb1d3 AppKit`-[NSApplication run] + 517
frame #22: 0x00007fff9279fc06 AppKit`NSApplicationMain + 869
frame #23: 0x0000000100001842 River`main(argc=5, argv=0x00007fff5fbff7b0) + 34 at main.m:13
frame #24: 0x00007fff93aed7e1 libdyld.dylib`start + 1
这是运行测试时的回溯：
* thread #1: tid = 0x2503, 0x00007fff8ffb6250 libobjc.A.dylib`objc_msgSend + 16, stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
frame #0: 0x00007fff8ffb6250 libobjc.A.dylib`objc_msgSend + 16
frame #1: 0x00007fff88ffe708 Foundation`___NSURLConnectionWillCacheResponse_block_invoke_0 + 110
frame #2: 0x00007fff88e86528 Foundation`__65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke_0 + 28
frame #3: 0x00007fff88e8646c Foundation`-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 227
frame #4: 0x00007fff88e86368 Foundation`-[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 63
frame #5: 0x00007fff88ffda3c Foundation`_NSURLConnectionWillCacheResponse + 126
frame #6: 0x00007fff879f8272 CFNetwork`___delegate_willCacheResponse_block_invoke_0 + 48
frame #7: 0x00007fff87a75a7a CFNetwork`___withDelegateAsync_block_invoke_0 + 90
frame #8: 0x00007fff87b062ea CFNetwork`__block_global_1 + 28
frame #9: 0x00007fff90110154 CoreFoundation`CFArrayApplyFunction + 68
frame #10: 0x00007fff87a667e4 CFNetwork`RunloopBlockContext::perform() + 124
frame #11: 0x00007fff87a666bb CFNetwork`MultiplexerSource::perform() + 221
frame #12: 0x00007fff900f1b31 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
frame #13: 0x00007fff900f1455 CoreFoundation`__CFRunLoopDoSources0 + 245
frame #14: 0x00007fff901147f5 CoreFoundation`__CFRunLoopRun + 789
frame #15: 0x00007fff901140e2 CoreFoundation`CFRunLoopRunSpecific + 290
frame #16: 0x00007fff88f03f5e Foundation`-[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 268
frame #17: 0x00007fff88f03e0b Foundation`-[NSRunLoop(NSRunLoop) runUntilDate:] + 78
frame #18: 0x00000001006beba2 RiverTests`runExampleBlock(block=0x00000001020b68b0, name=0x00000001020b6950) + 562 at SPTExampleGroup.m:31
frame #19: 0x00000001006bfd08 RiverTests`__48-[SPTExampleGroup compileExamplesWithNameStack:]_block_invoke(.block_descriptor=0x00000001020b6a50) + 200 at SPTExampleGroup.m:241
frame #20: 0x00000001006c0877 RiverTests`-[SPTSenTestCase SPT_runExampleAtIndex:](self=0x00000001020e04a0, _cmd=0x0000000100519090, index=0) + 423 at SPTSenTestCase.m:61
frame #21: 0x00000001006c0bfd RiverTests`__33+[SPTSenTestCase testInvocations]_block_invoke(.block_descriptor=0x00000001020e03d0) + 61 at SPTSenTestCase.m:82
frame #22: 0x00000001006c142d RiverTests`-[SPTSenTestInvocation invoke](self=0x00000001020e0170, _cmd=0x00007fff9303afa4) + 93 at SPTSenTestInvocation.m:16
frame #23: 0x00000001007d2a05 SenTestingKit`-[SenTestCase invokeTest] + 164
frame #24: 0x00000001007d2b7f SenTestingKit`-[SenTestCase performTest:] + 173
frame #25: 0x00000001006c11ab RiverTests`-[SPTSenTestCase performTest:](self=0x00000001020e04a0, _cmd=0x00000001007d87f4, run=0x000000010055bb30) + 123 at SPTSenTestCase.m:127
frame #26: 0x00000001007d2453 SenTestingKit`-[SenTest run] + 65
frame #27: 0x00000001007d5dc1 SenTestingKit`-[SenTestSuite performTest:] + 125
frame #28: 0x00000001007d2453 SenTestingKit`-[SenTest run] + 65
frame #29: 0x00000001007d5dc1 SenTestingKit`-[SenTestSuite performTest:] + 125
frame #30: 0x00000001007d2453 SenTestingKit`-[SenTest run] + 65
frame #31: 0x00000001007d5dc1 SenTestingKit`-[SenTestSuite performTest:] + 125
frame #32: 0x00000001007d2453 SenTestingKit`-[SenTest run] + 65
frame #33: 0x00000001007d4b18 SenTestingKit`+[SenTestProbe runTests:] + 134
frame #34: 0x00007fff88edc395 Foundation`__NSFireDelayedPerform + 358
frame #35: 0x00007fff9012f804 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
frame #36: 0x00007fff9012f31d CoreFoundation`__CFRunLoopDoTimer + 557
frame #37: 0x00007fff90114ad9 CoreFoundation`__CFRunLoopRun + 1529
frame #38: 0x00007fff901140e2 CoreFoundation`CFRunLoopRunSpecific + 290
frame #39: 0x00007fff8a660eb4 HIToolbox`RunCurrentEventLoopInMode + 209
frame #40: 0x00007fff8a660b94 HIToolbox`ReceiveNextEventCommon + 166
frame #41: 0x00007fff8a660ae3 HIToolbox`BlockUntilNextEventMatchingListInMode + 62
frame #42: 0x00007fff92804563 AppKit`_DPSNextEvent + 685
frame #43: 0x00007fff92803e22 AppKit`-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
frame #44: 0x00007fff927fb1d3 AppKit`-[NSApplication run] + 517
frame #45: 0x00007fff9279fc06 AppKit`NSApplicationMain + 869
frame #46: 0x0000000100001842 River`main(argc=8, argv=0x00007fff5fbff6d8) + 34 at main.m:13
frame #47: 0x00007fff93aed7e1 libdyld.dylib`start + 1
这些顶部看起来像同一个问题。这是我的代码中某处的问题（我不知道它会在哪里）还是有什么方法可以缓解这个问题？
I've tried the typical debugging tips like turning on zombie objects and printing out the contents of the registers when it crashes, neither of those help at all. The registers appear to contain garbage, and having zombies enabled doesn't give any information.