iOS 崩溃日志 - 无应用程序代码

Question

我们的设备发生崩溃，并有一个奇怪的崩溃日志，其中不包含我们应用程序的任何代码。知道是什么原因造成的吗？

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000000e0000010
Triggered by Thread:  5

Thread 0:
0   libsystem_kernel.dylib          0x3a773a50 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x3a773849 mach_msg + 37
2   CoreFoundation                  0x2f5c6625 __CFRunLoopServiceMachPort + 153
3   CoreFoundation                  0x2f5c4d8b __CFRunLoopRun + 859
4   CoreFoundation                  0x2f52f765 CFRunLoopRunSpecific + 521
5   CoreFoundation                  0x2f52f547 CFRunLoopRunInMode + 103
6   GraphicsServices                0x344666cf GSEventRunModal + 135
7   UIKit                           0x31e8e88d UIApplicationMain + 1133
8   MyApp                   0x0002ae4b main (main.m:15)
9   MyApp                   0x0001ff44 start + 36

Thread 1:
0   libsystem_kernel.dylib          0x3a773804 kevent64 + 24
1   libdispatch.dylib               0x3a6c2051 _dispatch_mgr_invoke + 229
2   libdispatch.dylib               0x3a6bc2df _dispatch_mgr_thread + 35

Thread 2 name:  com.apple.NSURLConnectionLoader
Thread 2:
0   libsystem_kernel.dylib          0x3a773a50 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x3a773849 mach_msg + 37
2   CoreFoundation                  0x2f5c6625 __CFRunLoopServiceMachPort + 153
3   CoreFoundation                  0x2f5c4d45 __CFRunLoopRun + 789
4   CoreFoundation                  0x2f52f765 CFRunLoopRunSpecific + 521
5   CoreFoundation                  0x2f52f547 CFRunLoopRunInMode + 103
6   Foundation                      0x2ff6f23d +[NSURLConnection(Loader) _resourceLoadLoop:] + 317
7   Foundation                      0x2ffe4a0b __NSThread__main__ + 1059
8   libsystem_pthread.dylib         0x3a7ed957 _pthread_body + 139
9   libsystem_pthread.dylib         0x3a7ed8c7 _pthread_start + 99
10  libsystem_pthread.dylib         0x3a7ebae4 thread_start + 4

Thread 3:
0   libsystem_kernel.dylib          0x3a786c70 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x3a7ebc1f _pthread_wqthread + 307
2   libsystem_pthread.dylib         0x3a7ebad8 start_wqthread + 4

Thread 4 name:  com.apple.CFSocket.private
Thread 4:
0   libsystem_kernel.dylib          0x3a786434 __select + 20
1   CoreFoundation                  0x2f5ca51f __CFSocketManager + 483
2   libsystem_pthread.dylib         0x3a7ed957 _pthread_body + 139
3   libsystem_pthread.dylib         0x3a7ed8c7 _pthread_start + 99
4   libsystem_pthread.dylib         0x3a7ebae4 thread_start + 4

Thread 5 Crashed:
0   libobjc.A.dylib                 0x3a1e066b objc_release + 11
1   libobjc.A.dylib                 0x3a1e10cf (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 355
2   libobjc.A.dylib                 0x3a1e1b49 (anonymous namespace)::AutoreleasePoolPage::tls_dealloc(void*) + 37
3   libsystem_pthread.dylib         0x3a7ec6cf _pthread_tsd_cleanup + 163
4   libsystem_pthread.dylib         0x3a7ec44f _pthread_exit + 83
5   libsystem_pthread.dylib         0x3a7ed1b5 pthread_exit + 25
6   Foundation                      0x2ff386ff +[NSThread exit] + 7
7   Foundation                      0x2ffe4a29 __NSThread__main__ + 1089
8   libsystem_pthread.dylib         0x3a7ed957 _pthread_body + 139
9   libsystem_pthread.dylib         0x3a7ed8c7 _pthread_start + 99
10  libsystem_pthread.dylib         0x3a7ebae4 thread_start + 4

Thread 6:
0   libsystem_kernel.dylib          0x3a786c70 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x3a7ebc1f _pthread_wqthread + 307
2   libsystem_pthread.dylib         0x3a7ebad8 start_wqthread + 4

Thread 7:
0   libsystem_kernel.dylib          0x3a786c70 __workq_kernreturn + 8
1   libsystem_pthread.dylib         0x3a7ebc1f _pthread_wqthread + 307
2   libsystem_pthread.dylib         0x3a7ebad8 start_wqthread + 4

Thread 5 crashed with ARM Thread State (32-bit):
    r0: 0x156ba550    r1: 0xe0000000      r2: 0x00000001      r3: 0x15b9d028
    r4: 0x15b9d000    r5: 0x0679d0a4      r6: 0xa3a3a3a3      r7: 0x0679cd5c
    r8: 0x15b9d028    r9: 0x9a001683     r10: 0x00000000     r11: 0x3c473a30
    ip: 0x3a96f7b0    sp: 0x0679cb2c      lr: 0x3a1e10d3      pc: 0x3a1e066a
  cpsr: 0x20000030

我们检查了僵尸对象，但没有找到任何对象。非常感谢帮助。

Answer 1

我们能够重现该问题，并发现这是 iPad Airs 上的内存问题。我们发现，出于某种原因，这些 iPad Air 上的 iOS 正在尝试释放无效的内存地址或之前释放的地址。我们现在能够在 iPad Air 上按需复制，但在其他 iPad 上没有看到同样的问题。