Question

我在解除设备上的视图控制器时遇到EXC_BAD_ACCESS错误。但奇怪的是，这不会发生在模拟器中。

问题：我正在使用仪器和NSZombies启用，这是错误的报告。我没有得到它的头和尾。据我所知，这显示了ref Count + es和-es。但是我的代码在哪里产生了这个错误？我只看到负责的调用者是UIVIew s，CATransaction s，我的代码在哪里？ NSZombie/Bad access

CRASH LOG

Thread 0:
0   libsystem_kernel.dylib          0x00000001923d5cc0 mach_msg_trap + 8
1   CoreFoundation                  0x0000000185992ca8 __CFRunLoopServiceMachPort + 180
2   CoreFoundation                  0x0000000185990e9c __CFRunLoopRun + 932
3   CoreFoundation                  0x00000001858d1b34 CFRunLoopRunSpecific + 448
4   itunesstored                    0x00000001000bfe14 0x1000b0000 + 65044
5   libdyld.dylib                   0x00000001922f3a9c start + 0

Thread 1:
0   libsystem_kernel.dylib          0x00000001923d5ac8 kevent64 + 8
1   libdispatch.dylib               0x00000001922d9d74 _dispatch_mgr_thread + 48

Thread 2 name:  com.apple.NSURLConnectionLoader
Thread 2:
0   libsystem_kernel.dylib          0x00000001923d5cc0 mach_msg_trap + 8
1   CoreFoundation                  0x0000000185992ca8 __CFRunLoopServiceMachPort + 180
2   CoreFoundation                  0x0000000185990e38 __CFRunLoopRun + 832
3   CoreFoundation                  0x00000001858d1b34 CFRunLoopRunSpecific + 448
4   Foundation                      0x00000001864be7f8 +[NSURLConnection(Loader) _resourceLoadLoop:] + 344
5   Foundation                      0x000000018654c76c __NSThread__main__ + 996
6   libsystem_pthread.dylib         0x00000001924701ac _pthread_body + 164
7   libsystem_pthread.dylib         0x0000000192470104 _pthread_start + 136
8   libsystem_pthread.dylib         0x000000019246d7ac thread_start + 0

Thread 3 name:  com.apple.CFSocket.private
Thread 3:
0   libsystem_kernel.dylib          0x00000001923ee76c select$DARWIN_EXTSN + 8
1   libsystem_pthread.dylib         0x00000001924701ac _pthread_body + 164
2   libsystem_pthread.dylib         0x0000000192470104 _pthread_start + 136
3   libsystem_pthread.dylib         0x000000019246d7ac thread_start + 0

Thread 4:
0   libsystem_kernel.dylib          0x00000001923ee394 __psynch_cvwait + 8
1   MobileSystemServices            0x000000018bc8d53c MOXPCTransportReceiveMessage + 268 2   MobileInstallation                0x000000018bc48900 perform_command + 280
3   MobileInstallation              0x000000018bc491e8 MobileInstallationLookup + 388
4   itunesstored                    0x00000001000e985c 0x1000b0000 + 235612
5   libdispatch.dylib               0x00000001922d841c _dispatch_call_block_and_release + 20
6   libdispatch.dylib               0x00000001922d83dc _dispatch_client_callout + 12
7   libdispatch.dylib               0x00000001922df3f8 _dispatch_root_queue_drain + 396
8   libdispatch.dylib               0x00000001922df634 _dispatch_worker_thread2 + 72
9   libsystem_pthread.dylib         0x000000019246d914 _pthread_wqthread + 352
10  libsystem_pthread.dylib         0x000000019246d7a4 start_wqthread + 0

Thread 5:
0   libsystem_kernel.dylib          0x00000001923eee74 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x000000019246d7a4 start_wqthread + 0

Thread 6:
0   libsystem_kernel.dylib          0x00000001923d5cc0 mach_msg_trap + 8
1   CoreFoundation                  0x0000000185992ca8 __CFRunLoopServiceMachPort + 180
2   CoreFoundation                  0x0000000185990e38 __CFRunLoopRun + 832
3   CoreFoundation                  0x00000001858d1b34 CFRunLoopRunSpecific + 448
4   iTunesStore                     0x00000001903c2a58 -[ISOperation runRunLoopUntilStopped] + 200
5   iTunesStore                     0x00000001903c9f84 -[ISURLOperation _runRequestWithURL:] + 1256
6   iTunesStore                     0x00000001903c9a30 -[ISURLOperation _run] + 428
7   iTunesStore                     0x00000001903c5588 -[ISURLOperation run] + 328
8   iTunesStore                     0x00000001903d2324 -[ISStoreURLOperation _runURLOperation] + 696
9   iTunesStore                     0x00000001903d0b68 -[ISStoreURLOperation run] + 568
10  iTunesStore                     0x00000001903c4214 -[ISOperation _main:] + 304
11  iTunesStore                     0x00000001903c35cc -[ISOperation main] + 548
12  iTunesStore                     0x00000001903c2b94 -[ISOperation runSubOperation:returningError:] + 220
13  iTunesStore                     0x00000001903ce928 -[ISLoadURLBagOperation run] + 884
14  iTunesStore                     0x00000001903c4214 -[ISOperation _main:] + 304
15  iTunesStore                     0x00000001903c35cc -[ISOperation main] + 548
16  iTunesStore                     0x00000001903c2b94 -[ISOperation runSubOperation:returningError:] + 220
17  iTunesStore                     0x00000001903d1f74 -[ISStoreURLOperation _resolvedURLInBagContext:URLBag:] + 104
18  iTunesStore                     0x00000001903d20e4 -[ISStoreURLOperation _runURLOperation] + 120
19  iTunesStore                     0x00000001903d0b68 -[ISStoreURLOperation run] + 568
20  iTunesStore                     0x00000001903c4214 -[ISOperation _main:] + 304
21  iTunesStore                     0x00000001903c35cc -[ISOperation main] + 548
22  Foundation                      0x0000000186474d34 -[__NSOperationInternal _start:] + 640
23  Foundation                      0x0000000186536d78 __NSOQSchedule_f + 72
24  libdispatch.dylib               0x00000001922d83dc _dispatch_client_callout + 12
25  libdispatch.dylib               0x00000001922dd92c _dispatch_async_redirect_invoke + 148
26  libdispatch.dylib               0x00000001922d83dc _dispatch_client_callout + 12
27  libdispatch.dylib               0x00000001922df3f8 _dispatch_root_queue_drain + 396
28  libdispatch.dylib               0x00000001922df634 _dispatch_worker_thread2 + 72
29  libsystem_pthread.dylib         0x000000019246d914 _pthread_wqthread + 352
30  libsystem_pthread.dylib         0x000000019246d7a4 start_wqthread + 0

Thread 7 name:  Data corruption: Malformed Mach message or kernel bug.
Thread 7 Crashed:
0   libxpc.dylib                    0x0000000192488f9c _xpc_connection_mach_event + 1992
1   libdispatch.dylib               0x00000001922d84b0 _dispatch_client_callout4 + 12
2   libdispatch.dylib               0x00000001922dabdc _dispatch_mach_msg_invoke + 148
3   libdispatch.dylib               0x00000001922de698 _dispatch_queue_drain + 456
4   libdispatch.dylib               0x00000001922da620 _dispatch_mach_invoke + 104
5   libdispatch.dylib               0x00000001922dd8d0 _dispatch_async_redirect_invoke + 56
6   libdispatch.dylib               0x00000001922d83dc _dispatch_client_callout + 12
7   libdispatch.dylib               0x00000001922df3f8 _dispatch_root_queue_drain + 396
8   libdispatch.dylib               0x00000001922df634 _dispatch_worker_thread2 + 72
9   libsystem_pthread.dylib         0x000000019246d914 _pthread_wqthread + 352
10  libsystem_pthread.dylib         0x000000019246d7a4 start_wqthread + 0

Thread 8:
0   libsystem_kernel.dylib          0x00000001923ee3dc __psynch_mutexwait + 8
1   Foundation                      0x000000018645b958 -[NSLock lock] + 152
2   iTunesStore                     0x00000001903e7760 ISUniqueOperationLock + 228
3   iTunesStore                     0x00000001903c3408 -[ISOperation main] + 96
4   iTunesStore                     0x00000001903c2b94 -[ISOperation runSubOperation:returningError:] + 220
5   iTunesStore                     0x00000001903cf438 -[ISOperation(ISLoadURLBagAdditions) loadURLBagWithContext:returningError:] + 112
6   itunesstored                    0x00000001001046e0 0x1000b0000 + 345824
7   iTunesStore                     0x00000001903c4214 -[ISOperation _main:] + 304
8   iTunesStore                     0x00000001903c35cc -[ISOperation main] + 548
9   Foundation                      0x0000000186474d34 -[__NSOperationInternal _start:] + 640
10  Foundation                      0x0000000186536d78 __NSOQSchedule_f + 72
11  libdispatch.dylib               0x00000001922d83dc _dispatch_client_callout + 12
12  libdispatch.dylib               0x00000001922dd92c _dispatch_async_redirect_invoke + 148
13  libdispatch.dylib               0x00000001922d83dc _dispatch_client_callout + 12
14  libdispatch.dylib               0x00000001922df3f8 _dispatch_root_queue_drain + 396
15  libdispatch.dylib               0x00000001922df634 _dispatch_worker_thread2 + 72
16  libsystem_pthread.dylib         0x000000019246d914 _pthread_wqthread + 352
17  libsystem_pthread.dylib         0x000000019246d7a4 start_wqthread + 0

Thread 9:
0   libsystem_kernel.dylib          0x00000001923eee74 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x000000019246d7a4 start_wqthread + 0

Thread 10:
0   libsystem_kernel.dylib          0x00000001923eee74 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x000000019246d7a4 start_wqthread + 0

Thread 7 crashed with ARM Thread State (64-bit):
    x0: 0x0000000000000036   x1: 0x0000000000000037   x2: 0x00000001924a516e   x3: 0x0000000000000037
    x4: 0x0000000102263bc8   x5: 0x0000000000000036   x6: 0x0000000000000000   x7: 0x0000000000000110
    x8: 0x7300ae44061c0155   x9: 0x7300ae44061c0155  x10: 0x0000000102263bc8  x11: 0x0000000000000000
   x12: 0x000000000000006f  x13: 0x000000019239e3d1  x14: 0x000000000000005f  x15: 0x000000019239be4b 
   x16: 0x0000000192468e90  x17: 0x0021c35bf1cc0111  x18: 0x0000000000000000  x19: 0x0000000147db6140
   x20: 0x0000000147e999f0  x21: 0x0000000147e34d80  x22: 0x000000001000000c  x23: 0x0000000147d8aa00
   x24: 0x00000001022640e0  x25: 0x0000000147d436d0  x26: 0x0000000000020001  x27: 0x000000000000000a
   x28: 0x00000001022640e0   fp: 0x0000000102263d50   lr: 0x0000000192488f9c   sp: 0x0000000102263c80
    pc: 0x0000000192488f9c cpsr: 0x60000000

Answer 1

您的应用程序崩溃并显示消息“数据损坏：格式错误的Mach消息或内核错误”。这意味着它所说的内容（在这种情况下，错误最有可能不是你的），或者（更可能是IMO）你正在追踪你不拥有的内存。查找内存覆盖很难，但Apple提供了帮助您的工具 - 请参阅TN2124。

我尝试在模拟器中启用MallocGuardEdges et al并查看是否崩溃（您可以在Scheme配置中从Xcode执行此操作。）或者，您可以尝试启用Guard Malloc，这也可能有所帮助。

EXC_BAD_ACCESS，使用NSZombies追踪

1 个答案: