iphone - 如何诊断 iPad iPhone 应用程序中的 EXC_BREAKPOINT (SIGTRAP) 崩溃？

Question

我的 iPad 应用程序崩溃了(至少对我来说)是非特定的。这是一个异常类型:EXC_BREAKPOINT。我正在考虑双重内存释放或尝试访问已释放的变量，但我希望有人可以在我搜索代码时提供更多信息。完整的崩溃日志是:

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x00000102, 0x31ccebd0
Crashed Thread:  0

Thread 0 Crashed:
0   CoreFoundation                 0x0000ab96 CFRelease + 90
1   CoreFoundation                 0x0005209e __CFRunLoopTimerDeallocate + 18
2   CoreFoundation                 0x0000ac68 _CFRelease + 160
3   CoreFoundation                 0x0000ab8e CFRelease + 82
4   CoreFoundation                 0x00019130 __CFTypeCollectionRelease + 8
5   CoreFoundation                 0x00019962 __CFArrayReleaseValues + 302
6   CoreFoundation                 0x0001982c __CFArrayDeallocate + 8
7   CoreFoundation                 0x0000ac68 _CFRelease + 160
8   CoreFoundation                 0x0000ab8e CFRelease + 82
9   CoreFoundation                 0x000279c4 __CFRunLoopRun + 1092
10  CoreFoundation                 0x0002748c CFRunLoopRunSpecific + 224
11  CoreFoundation                 0x00027394 CFRunLoopRunInMode + 52
12  GraphicsServices               0x000044a4 GSEventRunModal + 108
13  GraphicsServices               0x00004550 GSEventRun + 56
14  UIKit                          0x000374ce -[UIApplication _run] + 406
15  UIKit                          0x00035148 UIApplicationMain + 664
16  MultipleDetailViews            0x00002ccc main (main.m:55)
17  MultipleDetailViews            0x00002c80 start + 32

Thread 1:
0   libSystem.B.dylib              0x0002d974 kevent + 24
1   libSystem.B.dylib              0x000d7704 _dispatch_mgr_invoke + 88
2   libSystem.B.dylib              0x000d7174 _dispatch_queue_invoke + 96
3   libSystem.B.dylib              0x000d6b98 _dispatch_worker_thread2 + 120
4   libSystem.B.dylib              0x0007b24a _pthread_wqthread + 258
5   libSystem.B.dylib              0x00073970 start_wqthread + 0

Thread 2:
0   libSystem.B.dylib              0x00001268 mach_msg_trap + 20
1   libSystem.B.dylib              0x00003354 mach_msg + 44
2   CoreFoundation                 0x00027e54 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                 0x000276de __CFRunLoopRun + 350
4   CoreFoundation                 0x0002748c CFRunLoopRunSpecific + 224
5   CoreFoundation                 0x00027394 CFRunLoopRunInMode + 52
6   WebCore                        0x000060c8 RunWebThread(void*) + 332
7   libSystem.B.dylib              0x0007a886 _pthread_start + 242
8   libSystem.B.dylib              0x0006fa88 thread_start + 0

Thread 3:
0   libSystem.B.dylib              0x00001268 mach_msg_trap + 20
1   libSystem.B.dylib              0x00003354 mach_msg + 44
2   CoreFoundation                 0x00027e54 __CFRunLoopServiceMachPort + 88
3   CoreFoundation                 0x000276de __CFRunLoopRun + 350
4   CoreFoundation                 0x0002748c CFRunLoopRunSpecific + 224
5   CoreFoundation                 0x00027394 CFRunLoopRunInMode + 52
6   Foundation                     0x0002d5f6    +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 206
7   Foundation                     0x0000b192 -[NSThread main] + 38
8   Foundation                     0x00004242 __NSThread__main__ + 966
9   libSystem.B.dylib              0x0007a886 _pthread_start + 242
10  libSystem.B.dylib              0x0006fa88 thread_start + 0

Thread 4:
0   libSystem.B.dylib              0x0002568c select$DARWIN_EXTSN + 20
1   CoreFoundation                 0x0005ee72 __CFSocketManager + 582
2   libSystem.B.dylib              0x0007a886 _pthread_start + 242
3   libSystem.B.dylib              0x0006fa88 thread_start + 0

Thread 0 crashed with ARM Thread State:
    r0: 0x00000000    r1: 0x2fdff994      r2: 0x3e56e898      r3: 0x00000118
    r4: 0x00000000    r5: 0x001eb094      r6: 0x0000002c      r7: 0x2fdfec04
    r8: 0x001eb090    r9: 0x001fc098     r10: 0x00000000     r11: 0x00000000
    ip: 0x3e58f038    sp: 0x2fdfebfc      lr: 0x31d160a5      pc: 0x31cceb96
  cpsr: 0x600f0030

Answer 1

我也遇到了这个错误并修复了它。此人很可能正在运行 OS3，而您正在使用 OS4 中的代码块，您需要在库上设置弱链接，以便它可以正确加载。在 LLVM 的build设置中 -weak_library/usr/lib/libSystem.B.dylib