ios - 如何理解 iPhone App 的崩溃报告

Question

此 iPhone 应用程序将自动调用和挂断电话。它适用于越狱设备。有时挂断电话会死机。问题是什么，我该如何解决？

Exception Type:  EXC_GUARD
Exception Subtype: GUARD_TYPE_FD
Exception Message: CLOSE on file descriptor 16 (guarded with 0x08fd4dbfade2dead)
Triggered by Thread:  0

Thread 0 Crashed:
0   libsystem_kernel.dylib          0x38cdf130 __close_nocancel + 12
1   libsystem_c.dylib               0x38c4fcd5 fclose + 69
2   libCGFreetype.A.dylib           0x2e56dde5 FT::file_stream::~file_stream() + 25
3   libCGFreetype.A.dylib           0x2e56ddbb FT::file_stream::~file_stream() + 7
4   libCGFreetype.A.dylib           0x2e5730b5 destroy_face + 117
5   libCGFreetype.A.dylib           0x2e573039 FT_Done_Face + 93
6   libCGFreetype.A.dylib           0x2e5658e3 FT::face_release(FT_FaceRec_*) + 95
7   libCGFreetype.A.dylib           0x2e568f31 FT::font::~font() + 269
8   libCGFreetype.A.dylib           0x2e568e13 FT::font::~font() + 7
9   libCGFreetype.A.dylib           0x2e56fa77 (anonymous namespace)::release_private_data(void*) + 55
10  CoreGraphics                    0x2e51301f font_finalize + 27
11  CoreFoundation                  0x2e2ffe2d CFRelease + 465
12  libcache.dylib                  0x38bc321f _value_entry_remove + 139
13  libcache.dylib                  0x38bc25b3 _entry_remove + 195
14  libcache.dylib                  0x38bc2761 cache_remove_with_block + 129
15  CoreFoundation                  0x2e307fcb __CFNotificationCenterAddObserver_block_invoke + 123
16  CoreFoundation                  0x2e391e6f __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 11
17  CoreFoundation                  0x2e305aad _CFXNotificationPost + 1717
18  Foundation                      0x2ecebec1 -[NSNotificationCenter postNotificationName:object:userInfo:] + 69
19  UIKit                           0x30bd7e79 -[UIApplication _handleApplicationSuspend:eventInfo:] + 909
20  UIKit                           0x30b590c3 -[UIApplication handleEvent:withNewEvent:] + 771
21  UIKit                           0x30b58cf9 -[UIApplication sendEvent:] + 69
22  UIKit                           0x30bbe31d _UIApplicationHandleEvent + 661
23  GraphicsServices                0x3303876b _PurpleEventCallback + 607
24  GraphicsServices                0x33038353 PurpleEventCallback + 31
25  CoreFoundation                  0x2e39a775 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 33
26  CoreFoundation                  0x2e39a70f __CFRunLoopDoSource1 + 343
27  CoreFoundation                  0x2e398edb __CFRunLoopRun + 1403
28  CoreFoundation                  0x2e30346d CFRunLoopRunSpecific + 521
29  CoreFoundation                  0x2e30324f CFRunLoopRunInMode + 103
30  GraphicsServices                0x330372e7 GSEventRunModal + 135
31  UIKit                           0x30bb8841 UIApplicationMain + 1133
32  MyApp                           0x000f6d0d main (main.m:15)
33  libdyld.dylib                   0x38c29ab5 start + 1

Answer 1

您似乎有一个正在尝试关闭的虚假文件描述符。地址以“fade2dead”结尾，这可能是一个特殊值，表示已释放内存。由于我在堆栈跟踪中没有看到您的任何代码，很可能是某些东西正在覆盖 FreeType 库使用的内存。我会使用 GuardMalloc 或其他类似的内存工具在您的代码中寻找其他内存踩踏器来追踪它可能是什么，因为从上面的堆栈跟踪中它并不明显。