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我的应用程序是 ARC 遵守应用程序，但我仍然在崩溃报告中看到多次崩溃并显示消息“尝试取消引用垃圾指针”。他们很难诊断。

我的问题是为什么应用程序会因为内存问题而崩溃，即使我们在 ARC 上并且我们无法用相同的步骤重现它。如何应对此类崩溃？

一份这样的崩溃报告如下：

CrashReporterKey: 896d0c8676c0e02eb292865a654825359de4d427 HardwareModel: iPod4,1 Version: 5510 (3.0.0) OSVersion: iPhone OS 6.1.3 (10B329) Date/Time: 2013-08-15 09:50:51.000 -0700 Firmware Version:Version:2. 报告104

异常类型：EXC_BAD_ACCESS (SIGSEGV) 异常代码：0x31fd4078 处的 KERN_INVALID_ADDRESS 线程崩溃：0

Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libobjc.A.dylib 0x3b1ac5b0 objc_msgSend + 16 1 UIKit 0x3533c350 0x35338000 + 17232 2 UIKit 0x3533b6c8 0x35338000 + 14024 3
UIKit 0x3533b118 0x35338000 + 12568 4
GraphicsServices 0x3702d5a0 0x37027000 + 26016 5
GraphicsServices 0x3702d1d0 0x37027000 + 25040 6
CoreFoundation 0x33508170 0x33471000 + 618864 7
CoreFoundation 0x33508110 0x33471000 + 618768 8
CoreFoundation 0x33506f98 0x33471000 + 614296 9
CoreFoundation 0x33479eb8 CFRunLoopRunSpecific + 352 10 CoreFoundation 0x33479d48 CFRunLoopRunInMode + 104 11 GraphicsServices 0x3702c2e8 GSEventRunModal + 72 12 UIKit 0x3538f300 UIApplicationMain + 1120 13 MyApp 0x000a8e58 main +

线程 1 名称：调度队列：com.apple.libdispatch-manager 线程 1：0 libsystem_kernel.dylib 0x3b69f648 kevent64 + 24 1
libdispatch.dylib 0x3b5cadf8 0x3b5c7000 + 15864

Thread 2 name: WebThread Thread 2: 0 WebCore
0x39503560 0x3945d000 + 681312 1 WebCore
0x394e7f90 0x3945d000 + 569232 2 WebCore
0x394e2788 0x3945d000 + 546696 3 WebCore
0x396ca8a8 _ZN7WebCore11FrameLoader16detachFromParentEv + 64 4
WebKit 0x39e12618 0x39d8d000 + 546328 5
WebCore 0x394699c8 0x3945d000 + 51656 6
WebKit 0x39e12490 0x39d8d000 + 545936 7
WebKit 0x39e18570 0x39d8d000 + 570736 8
WebKit 0x39e184a8 0x39d8d000 + 570536 9
WebCore 0x394fb850 0x3945d000 + 649296 10 CoreFoundation 0x33508680 0x33471000 + 620160 11 CoreFoundation 0x33507ee8 0x33471000 + 618216 12 CoreFoundation 0x33506cb0 0x33471000 + 613552 13 CoreFoundation 0x33479eb8 CFRunLoopRunSpecific + 352 14 CoreFoundation 0x33479d48 CFRunLoopRunInMode + 104 15 WebCore 0x39467500 0x3945d000 + 42240 16 libsystem_c.dylib 0x3b608310 0x3b5f7000 + 70416

Thread 3 name: CommRunLoop Thread Thread 3: 0
libsystem_kernel.dylib 0x3b6af6a4 __semwait_signal + 24 1
Foundation 0x33decc60 0x33d99000 + 343136 2
MyApp 0x002be680 -[CommRunLoop runLoopThread:] + 504 3 Foundation 0x33e49e80 0x33d99000 + 724608 4 libsystem_c.dylib 0x3b608310 0x3b5f7000 + 70416

线程 4 名称：com.apple.CFSocket.private 线程 4：0
libsystem_kernel.dylib 0x3b6af594 select$DARWIN_EXTSN + 20 1 libsystem_c.dylib 0x3b608310 0x3b5f7000 + 70416

Thread 5: 0 libsystem_kernel.dylib 0x3b6af6a4 __semwait_signal + 24 1 Foundation 0x33decc60 0x33d99000 + 343136 2 MyApp 0x00333580 -[KSCrashDeadlockMonitor runMonitor] + 244 3 Foundation 0x33e49e80 0x33d99000 + 724608 4 libsystem_c.dylib
0x3b608310 0x3b5f7000 + 70416

线程 6 名称：KSCrash 异常处理程序（辅助）线程 6：0
libsystem_kernel.dylib 0x3b69eeb4 mach_msg_trap + 20 1
MyApp 0x0032f710 ksmachexc_i_handleExceptions + 124 2 libsystem_c.dylib 0x3b608310 0x3b5f7000 + 70416

线程 7 名称：KSCrash 异常处理程序（主）线程 7：

Thread 8 name: com.apple.NSURLConnectionLoader Thread 8: 0
libsystem_kernel.dylib 0x3b69eeb4 mach_msg_trap + 20 1
CoreFoundation 0x33508040 0x33471000 + 618560 2
CoreFoundation 0x33506da0 0x33471000 + 613792 3
CoreFoundation 0x33479eb8 CFRunLoopRunSpecific + 352 4 CoreFoundation 0x33479d48 CFRunLoopRunInMode + 104 5 Foundation 0x33dc63d0 0x33d99000 + 185296 6 基础 0x33e49e80 0x33d99000 + 724608 7
libsystem_c.dylib 0x3b608310 0x3b5f7000 + 70416

Thread 9 name: JavaScriptCore::BlockFree Thread 9: 0
libsystem_kernel.dylib 0x3b6af08c __psynch_cvwait + 24 1
libsystem_c.dylib 0x3b600aa0 pthread_cond_timedwait + 40 2 JavaScriptCore 0x37422c70 _ZN3WTF15ThreadCondition9timedWaitERNS_5MutexEd + 104 3 JavaScriptCore 0x37534550 0x373c7000 + 1496400 4
JavaScriptCore 0x37546fa8 0x373c7000 + 1572776 5
libsystem_c.dylib 0x3b608310 0x3b5f7000 + 70416

Thread 10 name: Dispatch queue: com.apple.root.background-priority Thread 10: 0 MyApp 0x00320a18 +[KSCrashReportFilterAppleFmt filterWithReportStyle:] + 0 1 libdispatch.dylib 0x3b5c9118 0x3b5c7000 + 8472 2
libdispatch.dylib 0x3b5d7258 0x3b5c7000 + 66136 3
libdispatch.dylib 0x3b5d73b8 0x3b5c7000 + 66488 4
libsystem_c.dylib 0x3b5fda10 0x3b5f7000 + 27152

线程 11：0 libsystem_kernel.dylib 0x3b6afd98 __workq_kernreturn + 8 1 libsystem_c.dylib 0x3b5fda10 0x3b5f7000 + 27152

线程 12：0 libsystem_kernel.dylib 0x3b6afd98 __workq_kernreturn + 8 1 libsystem_c.dylib 0x3b5fda10 0x3b5f7000 + 27152

线程 13：0 libsystem_kernel.dylib 0x3b6afd98 __workq_kernreturn + 8 1 libsystem_c.dylib 0x3b5fda10 0x3b5f7000 + 27152

Thread 0 crashed with ARM Thread State: r0: 0x1fd2a130 r1: 0x357e82c0 r2: 0x1fd3a6d0 r3: 0x20a8a4a0 r4: 0x31fd4070 r5: 0x20a8a4a0 r6: 0x2fd59a10 r7: 0x2fd599f8 r8: 0x20a8af20 r9: 0x0d5fa0b0 r10: 0xbecb6c00 r11: 0x1fd3a6d0 ip: 0x3bb2bd64 sp: 0x2fd599c8 lr：0x355abb97 pc：0x3b1ac5b0 cpsr：0x20000030

额外的信息：

堆栈转储（0x2fd599a0-0x2fd59a18）：

A8B4BC3B209FF240B499D52FADD81A3BA8B4BC3BC099D52F45D91A3BD0A6D31FC899D52FF1D01B3BA0A4A820D0A6D31F000000000020B23F00000000806DD9BF00000000E073ECBF0000000000000000009F63BF209FF240789AD52F51C3333500000000806DD9BF00000000E073ECBFDA1B7C21209FF240

值得注意的地址：{“r1”：{“地址”：897483456，“类型”：“字符串”，“值”：“加速度计：didAccelerate：”}，“r11”：{“地址”：533964496，“类”： “UIAccelerometer”，“ivars”：{“_delegate”：{“地址”：533897520，“类型”：“未知”}，“_updateInterval”：0.1}，“类型”：“objc_object”}，“r2”：{ “地址”：533964496，“类”：“UIAccelerometer”，“ivars”：{“_delegate”：{“地址”：533897520，“类型”：“未知”}，“_updateInterval”：0.1}，“类型”：“objc_object”}，“r3”：{“地址”：547923104，“类”：“UIAcceleration” ，“ivars”：{“时间戳”：76274，“x”：0.0708008，“y”：-0.397308，“z”：-0.889145}，“类型”：“objc_object”}，“r5”：{“地址” ：547923104，“类”：“UIAcceleration”，“ivars”：{“时间戳”：76274，“x”：0.0708008，“y”：-0.397308，“z”：-0.889145 }，“type”：“objc_object”}，“r8”：{“address”：547925792，“class”：“__NSCFType”，“ivars ": {}, "type": "objc_object" }, "stack@0x2fd599a0": { "address": 1002222760, "class": "UIAcceleration", "type": "objc_class" }, "stack@0x2fd599b0": {“地址”：1002222760，“类”：“UIAcceleration”，“类型”：“objc_class”}，“stack@0x2fd599bc”：{“地址”：533964496，“类”：“UIAccelerometer”，“ivars”：{“_delegate”：{“地址”：533897520，“类型”：“未知”}，“_updateInterval”：0.1}，“类型”：“objc_object”} ，“stack@0x2fd599c8”：{“地址”：547923104，“类”：“UIAcceleration”，“ivars”：{“时间戳”：76274，“x”：0.0708008，“y”：-0.397308，“z”： -0.889145 }，“类型”：“objc_object”}，“stack@0x2fd599cc”：{“地址”：533964496，“类”：“UIAccelerometer”，“ivars”：{“_delegate”：{“地址”：533897520，“类型”：“未知”}，“_updateInterval”：0.1}，“类型”：“objc_object”} }

CrashDoctor 诊断：尝试取消引用垃圾指针 0x31fd4078。

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1 回答 1

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即使您使用 ARC，仍然有可能编写错误代码——这不是魔术，而且仍然有规则。在这种情况下，尝试在打开“NSZombies”的情况下在 Xcode 中运行您的应用程序的调试版本。这样做的目的是，每次您的应用程序尝试释放一个对象时，Objective-C 都会将其替换为一个NSZombie对象，该对象会在您尝试使用它时提供更有用的错误消息（尝试取消引用垃圾指针，因为您很愚蠢CrashDoctor 的事情告诉你）。

于 2013-08-19T19:11:25.867 回答