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iOS 崩溃堆栈解析

iosxcodecrash
3
我们的 iPad 应用程序"MyApp"每天平均有 3000 名用户使用，但我们从现场接收到了多个无法重现的崩溃报告。原因是："向实例发送了未识别的选择器"。 受影响的设备：只有 iPad 1。
崩溃报告提到了[__NSCFDictionary buttonPressed:]，而buttonPressed:是UIButton的一个操作。显然，在这些崩溃情况下，按钮还没有准备好接收该消息。相反，该消息会被分派到内存中的其他某个实例（在大多数情况下是字典）。
通过xib文件将操作buttonPressed:附加到按钮上（还有一种情况是将操作以编程方式附加到图像视图）。当应用程序恢复时，用户可能首先触发操作buttonPressed:。我怀疑在这些情况下，应用程序尚未完全初始化（恢复），因此无法恢复正常。
我的怀疑基于一些符号（始终与这些崩溃同时出现）：_resourceLoadLoop（在主线程中执行？）和_dispatch_mgr_wakeup。
您对此有何看法？您是否曾遇到过类似的iPad 1客户端问题？是否已知存在此类缺陷？
以下是典型崩溃堆栈的核心内容：
Hardware Model:      iPad1,1
Code Type:       ARM
Parent Process:  launchd [1]

Date/Time:       2012-12-04 06:35:48 +0000
OS Version:      iPhone OS 5.1.1 (9B206)
Report Version:  104

Exception Type:  SIGABRT
Exception Codes: #0 at 0x35a2f32c
Crashed Thread:  0

Application Specific Information:
*** Terminating app due to uncaught exception \'NSInvalidArgumentException\', reason: \'-[__NSCFDictionary buttonPressed:]: unrecognized selector sent to instance 0x40eaa0\'

Last Exception Backtrace:
0   CoreFoundation                      0x359b988f __exceptionPreprocess + 163
1   libobjc.A.dylib                     0x335dd259 objc_exception_throw + 33
2   CoreFoundation                      0x359bca9b -[NSObject doesNotRecognizeSelector:] + 175
3   CoreFoundation                      0x359bb915 ___forwarding___ + 301
4   CoreFoundation                      0x35916650 _CF_forwarding_prep_0 + 48
5   CoreFoundation                      0x359133fd -[NSObject performSelector:withObject:withObject:] + 53
6   UIKit                               0x330d4e07 -[UIApplication sendAction:to:from:forEvent:] + 63
7   UIKit                               0x330d4dc3 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 31
8   UIKit                               0x330d4da1 -[UIControl sendAction:to:forEvent:] + 45
9   UIKit                               0x330d4b11 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 493
10  UIKit                               0x330d5449 -[UIControl touchesEnded:withEvent:] + 477
11  UIKit                               0x330d392b -[UIWindow _sendTouchesForEvent:] + 319
12  UIKit                               0x330d3319 -[UIWindow sendEvent:] + 381
13  UIKit                               0x330b9695 -[UIApplication sendEvent:] + 357
14  UIKit                               0x330b8f3b _UIApplicationHandleEvent + 5827
15  GraphicsServices                    0x336ab22b PurpleEventCallback + 883
16  CoreFoundation                      0x3598d523 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 39
17  CoreFoundation                      0x3598d4c5 __CFRunLoopDoSource1 + 141
18  CoreFoundation                      0x3598c313 __CFRunLoopRun + 1371
19  CoreFoundation                      0x3590f4a5 CFRunLoopRunSpecific + 301
20  CoreFoundation                      0x3590f36d CFRunLoopRunInMode + 105
21  GraphicsServices                    0x336aa439 GSEventRunModal + 137
22  UIKit                               0x330e7cd5 UIApplicationMain + 1081
23  MyApp                               0x0002411b main (main.m:14)
24  MyApp                               0x000240c0 start + 40


Thread 0 Crashed:
0   libsystem_kernel.dylib              0x35a2f32c __pthread_kill + 8
1   libsystem_c.dylib                   0x34c1029f abort + 95
2   MyApp                               0x0012d595 +[PLCrashReporter sharedReporter] + 1
3   CoreFoundation                      0x359b9957 __handleUncaughtException + 75
4   libobjc.A.dylib                     0x335dd345 _objc_terminate + 129
5   libc++abi.dylib                     0x352253c5 safe_handler_caller(void (*)()) + 77
6   libc++abi.dylib                     0x35225451 operator delete(void*) + 1
7   libc++abi.dylib                     0x35226825 __cxa_current_exception_type + 1
8   libobjc.A.dylib                     0x335dd2a9 objc_exception_rethrow + 13
9   CoreFoundation                      0x3590f50d CFRunLoopRunSpecific + 405
10  CoreFoundation                      0x3590f36d CFRunLoopRunInMode + 105
11  GraphicsServices                    0x336aa439 GSEventRunModal + 137
12  UIKit                               0x330e7cd5 UIApplicationMain + 1081
13  MyApp                               0x0002411b main (main.m:14)

Thread 1:
0   libsystem_kernel.dylib              0x35a1f3a8 kevent + 24
1   libdispatch.dylib                   0x33d52bc9 _dispatch_mgr_wakeup + 1

Thread 2:
0   libsystem_kernel.dylib              0x35a1f004 mach_msg_trap + 20
1   CoreFoundation                      0x3598d3f3 __CFRunLoopServiceMachPort + 127
2   CoreFoundation                      0x3598c12b __CFRunLoopRun + 883
3   CoreFoundation                      0x3590f4a5 CFRunLoopRunSpecific + 301
4   CoreFoundation                      0x3590f36d CFRunLoopRunInMode + 105
5   WebCore                             0x37655ca3 RunWebThread(void*) + 403
6   libsystem_c.dylib                   0x34bd8735 _pthread_start + 321

Thread 3:
0   libsystem_kernel.dylib              0x35a1f004 mach_msg_trap + 20
1   CoreFoundation                      0x3598d3f3 __CFRunLoopServiceMachPort + 127
2   CoreFoundation                      0x3598c12b __CFRunLoopRun + 883
3   CoreFoundation                      0x3590f4a5 CFRunLoopRunSpecific + 301
4   CoreFoundation                      0x3590f36d CFRunLoopRunInMode + 105
5   Foundation                          0x34d54bb9 +[NSURLConnection(Loader) _resourceLoadLoop:] + 309
6   Foundation                          0x34d54a81 -[NSThread main] + 73
7   Foundation                          0x34de8591 __NSThread__main__ + 1049
8   libsystem_c.dylib                   0x34bd8735 _pthread_start + 321

Thread 4:
0   libsystem_kernel.dylib              0x35a2f570 __select + 20
1   libsystem_c.dylib                   0x34bd8735 _pthread_start + 321

Thread 5:
0   libsystem_kernel.dylib              0x35a2fcd4 __workq_kernreturn + 8

Thread 6:
0   libsystem_kernel.dylib              0x35a2fcd4 __workq_kernreturn + 8

Thread 0 crashed with ARM Thread State:
    r0: 0x00000000     r1: 0x00000000     r2: 0x00000001     r3: 0x00000000 
    r4: 0x00000006     r5: 0x3f2dbd98     r6: 0x00000002     r7: 0x2fe20a38 
    r8: 0x00469e00     r9: 0x00000000    r10: 0x00000000    r11: 0x0040eaa0 
    ip: 0x00000148     sp: 0x2fe20a2c     lr: 0x34c1720f     pc: 0x35a2f32c 
  cpsr: 0x00080010 

Binary Images:
   0x22000 -   0x288fff +MyApp armv7  <1f677ffc81aa3ccf958c65a92cce8418> /var/mobile/Applications/1D49C89A-36EA-43FC-BE76-7B770E36491B/MyApp.app/MyApp
0x3049d000 - 0x30550fff  iTunesStore armv7  <b3c0cce5f8e632e18f841c32b68f57a1> /System/Library/PrivateFrameworks/iTunesStore.framework/iTunesStore
0x30555000 - 0x305d8fff  MapKit armv7  <e39706ac199134a497954e1f1d6d7245> /System/Library/Frameworks/MapKit.framework/MapKit
0x305d9000 - 0x305dffff  liblaunch.dylib armv7  <aa2bcba6fc7a36a191958fef2e995475> /usr/lib/system/liblaunch.dylib
0x306dd000 - 0x306f1fff  PersistentConnection armv7  <54091a638f8731cd85ccf00fa06972c3> /System/Library/PrivateFrameworks/PersistentConnection.framework/PersistentConnection
0x30745000 - 0x30824fff  RawCamera armv7  <293f818ba6533dceae8b900b6ed3c887> /System/Library/CoreServices/RawCamera.bundle/RawCamera
0x30825000 - 0x30882fff  StoreServices armv7  <6ce256d3cf433e4aa1af8d696bf1f75d> /System/Library/PrivateFrameworks/StoreServices.framework/StoreServices
0x30883000 - 0x308cffff  CoreTelephony armv7  <b8f80d5d594c31d2b5d8fba9fdedb7e1> /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony
0x308f1000 - 0x30929fff  VideoToolbox armv7  <9f25f38d1cd13a1daff99cfde8884410> /System/Library/PrivateFrameworks/VideoToolbox.framework/VideoToolbox
0x3092a000 - 0x30956fff  libtidy.A.dylib armv7  <3aacc5b650e037c086a8ff6657d154bf> /usr/lib/libtidy.A.dylib
0x30ef1000 - 0x30f42fff  CoreText armv7  <5bfac4ee88d03d5b87a1f105abb7756c> /System/Library/Frameworks/CoreText.framework/CoreText
0x30f43000 - 0x30f47fff  CertUI armv7  <f503892ef60e36108d28d8f9d6144d2a> /System/Library/PrivateFrameworks/CertUI.framework/CertUI
0x30fb3000 - 0x30fb3fff  liblangid.dylib armv7  <644ff4bcfbf337b5b5859e3f0fc0a9a8> /usr/lib/liblangid.dylib
0x30fb4000 - 0x30fcafff  EAP8021X armv7  <952fcfdec0633aff923768fca1a26fcb> /System/Library/PrivateFrameworks/EAP8021X.framework/EAP8021X
0x30fcb000 - 0x30fe0fff  libresolv.9.dylib armv7  <66f7557fa4b43979b186e00271839fdb> /usr/lib/libresolv.9.dylib
0x3129d000 - 0x312bafff  libsystem_info.dylib armv7  <50863bcbf478323e96a8e5b1a83ea6f9> /usr/lib/system/libsystem_info.dylib
0x312c0000 - 0x31433fff  MediaPlayer armv7  <63cdf8f9c66d36e7a4e69e2f6cae854f> /System/Library/Frameworks/MediaPlayer.framework/MediaPlayer
0x315ea000 - 0x315eafff  vecLib armv7  <a2cfe25e77aa36bfb4a30b2d0d2dd465> 
[...]
2个回答
0

与其说是过早激活，更可能是实现buttonPressed:的控制器已被释放并重新用于另一个对象的内存。如果仅限于某些设备，则可能是由于内存警告...以及从iOS 6中删除的视图卸载。

这是我的想法。iPad1的内存很珍贵，您的应用程序可能会收到viewDidUnload消息。您是否实现了它们？您可以在模拟器中测试此功能。 - David H
嗯，显然崩溃是由用户操作触发的。因此，在那个时刻，必须可见带有UIButton的视图。如果视图控制器的视图在此期间被卸载，则必须通过viewDidUnload / viewDidLoad周期进行往返处理。通过xib机制加载视图时，UIButton及其操作必须恢复正常工作。 - Heiko
0

当消息被发送到一个完全不正确的对象时，出现“未识别的选择器”异常通常是由于双重释放错误引起的。这意味着您的视图控制器（或具有buttonPressed：方法的任何其他对象）已被释放，并且其内存已被另一个对象（在本例中为字典）回收。

您应该检查您的内存管理代码。如果您还没有这样做，我强烈建议转换为ARC。这与iOS 4向后兼容（如果您不使用弱引用），并且通常会为您解决这些问题。

为了帮助调试此问题，您可以通过编辑方案诊断设置来启用僵尸检测。您还可以使用Instruments中的“zombies”工具。这两种技术都可以帮助确认您是否存在双重释放问题。

即使启用了僵尸检测，我们仍然无法按需重现崩溃。 - Heiko
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