我们有一个相当简单的原生iOS应用程序，几乎可以提交审批，除了一个讨厌的bug。那是在极少数情况下（当系统内存很低？只在iPad（3,1）上注意到）恢复应用程序时，它会挂起10秒然后崩溃。
该应用程序基本上是一个UIWebView，周围有一个轻量级shell，用于管理一些iCloud键值。我们正在使用原生Google分析，我们的网络视图内容使用缓存清单和本地存储。
我们只能在故意锤击系统Safari应用程序（通过打开许多大型网站）之后重现该错误，直到在标签之间切换导致safari开始刷新每个页面（好像Safari / iOS决定释放内存它将刷新已经打开的标签的内容）。由于我们的应用程序主要只是一个WebView，我们想知道系统是否正在转储我们的内容。如果发生了这一切，那就没问题......但是，它会挂起并崩溃。
我们知道它是8badf00d /未能及时恢复......但我们只是不知道是什么导致它。
我在下面发布了我们的崩溃日志。在此先感谢您的帮助！
Incident Identifier: 956DBEA0-ECA4-4E16-91F7-573A7AD7D44C
CrashReporter Key: 0d3d958fa8005603bcc173d27ae567507d0cbb19
Hardware Model: iPad3,1
Process: REDACTED [12885]
Path: /var/mobile/Applications/REDACTED/REDACTED.app/REDACTED
Identifier: REDACTED
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2013-08-25 15:28:14.138 -0400
OS Version: iOS 6.1.3 (10B329)
Report Version: 104
Exception Type: 00000020
Exception Codes: 0x000000008badf00d
Highlighted Thread: 0
Application Specific Information:
com.REDACTED.REDACTED failed to resume in time
Elapsed total CPU time (seconds): 18.710 (user 18.710, system 0.000), 93% CPU
Elapsed application CPU time (seconds): 9.513, 47% CPU
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libRIP.A.dylib 0x32d9ee8c convolve_buffer + 108
1 libRIP.A.dylib 0x32d99fa0 separable_convolve + 704
2 libRIP.A.dylib 0x32d8f35e symmetric_convolve + 414
3 libRIP.A.dylib 0x32d8f052 RIPLayerSymmetricConvolve + 554
4 libRIP.A.dylib 0x32d8eda0 RIPLayerGaussianBlur + 464
5 libRIP.A.dylib 0x32d9184a rips_s_BltShapeShadow + 458
6 libRIP.A.dylib 0x32d9944e rips_s_BltShape + 94
7 libRIP.A.dylib 0x32d897a0 ripc_Render + 248
8 libRIP.A.dylib 0x32d8b722 ripc_DrawPath + 338
9 CoreGraphics 0x32a6b4bc CGContextDrawPath + 144
10 WebCore 0x38a53246 WebCore::GraphicsContext::fillPath(WebCore::Path const&) + 558
11 WebCore 0x38b19518 WebCore::GraphicsContext::fillRectWithRoundedHole(WebCore::IntRect const&, WebCore::RoundedRect const&, WebCore::Color const&, WebCore::ColorSpace) + 396
12 WebCore 0x389836ec WebCore::RenderBoxModelObject::paintBoxShadow(WebCore::PaintInfo const&, WebCore::IntRect const&, WebCore::RenderStyle const*, WebCore::ShadowStyle, bool, bool) + 1644
13 WebCore 0x38982ba0 WebCore::RenderBox::paintBoxDecorations(WebCore::PaintInfo&, WebCore::IntPoint const&) + 348
14 WebCore 0x3898152a WebCore::RenderBlock::paintObject(WebCore::PaintInfo&, WebCore::IntPoint const&) + 58
15 WebCore 0x389828f4 WebCore::RenderBlock::paint(WebCore::PaintInfo&, WebCore::IntPoint const&) + 168
16 WebCore 0x38980126 WebCore::RenderLayer::paintLayerContents(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int) + 1086
17 WebCore 0x3897fcc6 WebCore::RenderLayer::paintLayer(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int) + 1078
18 WebCore 0x38980552 WebCore::RenderLayer::paintLayerContents(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, WebCore::RenderObject*, WebCore::RenderRegion*, WTF::HashMap<WebCore::OverlapTestRequestClient*, WebCore::IntRect, WTF::PtrHash<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::OverlapTestRequestClient*>, WTF::HashTraits<WebCore::IntRect> >*, unsigned int) + 2154
19 WebCore 0x38aab67e WebCore::RenderLayerBacking::paintIntoLayer(WebCore::RenderLayer*, WebCore::GraphicsContext*, WebCore::IntRect const&, unsigned int, unsigned int, WebCore::RenderObject*) + 150
20 WebCore 0x38aab4fa WebCore::RenderLayerBacking::paintContents(WebCore::GraphicsLayer const*, WebCore::GraphicsContext&, unsigned int, WebCore::IntRect const&) + 158
21 WebCore 0x38aab452 WebCore::GraphicsLayer::paintGraphicsLayerContents(WebCore::GraphicsContext&, WebCore::IntRect const&) + 94
22 WebCore 0x38aab37c __drawLayerContents_block_invoke_0 + 180
23 WebKit 0x39240e14 WKCALayerEnumerateRectsBeingDrawnWithBlock + 56
24 WebCore 0x38aaaf5c drawLayerContents(CGContext*, CALayer*, WebCore::PlatformCALayer*) + 520
25 QuartzCore 0x3457c1ae CABackingStoreUpdate_ + 1806
26 QuartzCore 0x3457b910 CA::Layer::display_() + 976
27 WebCore 0x38aaad02 -[WebLayer display] + 50
28 QuartzCore 0x34572936 CA::Layer::display_if_needed(CA::Transaction*) + 198
29 QuartzCore 0x34572860 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 20
30 QuartzCore 0x3457223e CA::Context::commit_transaction(CA::Transaction*) + 234
31 QuartzCore 0x3457204c CA::Transaction::commit() + 312
32 UIKit 0x3496d13e _UIWindowUpdateVisibleContextOrder + 206
33 UIKit 0x3496d00e +[UIWindow _prepareWindowsForAppResume] + 6
34 UIKit 0x3496cae8 -[UIApplication _handleApplicationResumeEvent:] + 72
35 UIKit 0x347c4d54 -[UIApplication handleEvent:withNewEvent:] + 1288
36 UIKit 0x347c46c8 -[UIApplication sendEvent:] + 68
37 UIKit 0x347c4116 _UIApplicationHandleEvent + 6150
38 GraphicsServices 0x364b85a0 _PurpleEventCallback + 588
39 CoreFoundation 0x32991680 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 12
40 CoreFoundation 0x32990ee4 __CFRunLoopDoSources0 + 208
41 CoreFoundation 0x3298fcb2 __CFRunLoopRun + 642
42 CoreFoundation 0x32902eb8 CFRunLoopRunSpecific + 352
43 CoreFoundation 0x32902d44 CFRunLoopRunInMode + 100
44 GraphicsServices 0x364b72e6 GSEventRunModal + 70
45 UIKit 0x348182fc UIApplicationMain + 1116
46 REDACTED 0x00087828 main (main.m:16)
47 libdyld.dylib 0x3ac89b1c start + 0
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x3ad40648 kevent64 + 24
1 libdispatch.dylib 0x3ac70974 _dispatch_mgr_invoke + 792
2 libdispatch.dylib 0x3ac70654 _dispatch_mgr_thread$VARIANT$mp + 32
Thread 2 name: WebThread
Thread 2:
0 libsystem_kernel.dylib 0x3ad500fc __psynch_mutexwait + 24
1 libsystem_c.dylib 0x3ac99124 pthread_mutex_lock + 388
2 WebCore 0x388f4418 _ZL17_WebTryThreadLockb + 184
3 WebCore 0x388f434a _ZL14WebRunLoopLockP19__CFRunLoopObservermPv + 42
4 CoreFoundation 0x329916ca __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 18
5 CoreFoundation 0x3298f9bc __CFRunLoopDoObservers + 272
6 CoreFoundation 0x3298fde8 __CFRunLoopRun + 952
7 CoreFoundation 0x32902eb8 CFRunLoopRunSpecific + 352
8 CoreFoundation 0x32902d44 CFRunLoopRunInMode + 100
9 WebCore 0x388f2500 _ZL12RunWebThreadPv + 440
10 libsystem_c.dylib 0x3aca930e _pthread_start + 306
11 libsystem_c.dylib 0x3aca91d4 thread_start + 4
Thread 3 name: com.crashlytics.MachExceptionServer
Thread 3:
0 libsystem_kernel.dylib 0x3ad3feb4 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3ad40048 mach_msg + 36
2 REDACTED 0x000ab1a4 CLSMachExceptionServer + 116
3 libsystem_c.dylib 0x3aca930e _pthread_start + 306
4 libsystem_c.dylib 0x3aca91d4 thread_start + 4
Thread 4 name: JavaScriptCore::BlockFree
Thread 4:
0 libsystem_kernel.dylib 0x3ad5008c __psynch_cvwait + 24
1 libsystem_c.dylib 0x3aca1d2a _pthread_cond_wait + 642
2 libsystem_c.dylib 0x3aca1aa0 pthread_cond_timedwait + 40
3 JavaScriptCore 0x368adc70 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 104
4 JavaScriptCore 0x369bf552 JSC::BlockAllocator::blockFreeingThreadMain() + 78
5 JavaScriptCore 0x369d1fa8 _ZN3WTFL19wtfThreadEntryPointEPv + 12
6 libsystem_c.dylib 0x3aca930e _pthread_start + 306
7 libsystem_c.dylib 0x3aca91d4 thread_start + 4
Thread 5 name: JavaScriptCore::Marking
Thread 5:
0 libsystem_kernel.dylib 0x3ad5008c __psynch_cvwait + 24
1 libsystem_c.dylib 0x3aca1d2a _pthread_cond_wait + 642
2 libsystem_c.dylib 0x3acabf14 pthread_cond_wait + 36
3 JavaScriptCore 0x36952f3c JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 144
4 JavaScriptCore 0x36952e7c JSC::MarkStackThreadSharedData::markingThreadMain() + 140
5 JavaScriptCore 0x369d1fa8 _ZN3WTFL19wtfThreadEntryPointEPv + 12
6 libsystem_c.dylib 0x3aca930e _pthread_start + 306
7 libsystem_c.dylib 0x3aca91d4 thread_start + 4
Thread 6 name: com.apple.NSURLConnectionLoader
Thread 6:
0 libsystem_kernel.dylib 0x3ad3feb4 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3ad40048 mach_msg + 36
2 CoreFoundation 0x32991040 __CFRunLoopServiceMachPort + 124
3 CoreFoundation 0x3298fd9e __CFRunLoopRun + 878
4 CoreFoundation 0x32902eb8 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x32902d44 CFRunLoopRunInMode + 100
6 Foundation 0x3324f3d0 +[NSURLConnection(Loader) _resourceLoadLoop:] + 304
7 Foundation 0x332d2e80 __NSThread__main__ + 968
8 libsystem_c.dylib 0x3aca930e _pthread_start + 306
9 libsystem_c.dylib 0x3aca91d4 thread_start + 4
Thread 7 name: WebCore: CFNetwork Loader
Thread 7:
0 libsystem_kernel.dylib 0x3ad3feb4 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3ad40048 mach_msg + 36
2 CoreFoundation 0x32991040 __CFRunLoopServiceMachPort + 124
3 CoreFoundation 0x3298fd9e __CFRunLoopRun + 878
4 CoreFoundation 0x32902eb8 CFRunLoopRunSpecific + 352
5 CoreFoundation 0x32902d44 CFRunLoopRunInMode + 100
6 WebCore 0x3898cd02 _ZN7WebCoreL15runLoaderThreadEPv + 138
7 JavaScriptCore 0x369d1fa8 _ZN3WTFL19wtfThreadEntryPointEPv + 12
8 libsystem_c.dylib 0x3aca930e _pthread_start + 306
9 libsystem_c.dylib 0x3aca91d4 thread_start + 4
Thread 8 name: com.apple.CFSocket.private
Thread 8:
0 libsystem_kernel.dylib 0x3ad50594 __select + 20
1 CoreFoundation 0x329951f2 __CFSocketManager + 674
2 libsystem_c.dylib 0x3aca930e _pthread_start + 306
3 libsystem_c.dylib 0x3aca91d4 thread_start + 4
Thread 9 name: WebCore: LocalStorage
Thread 9:
0 libsystem_kernel.dylib 0x3ad5008c __psynch_cvwait + 24
1 libsystem_c.dylib 0x3aca1d2a _pthread_cond_wait + 642
2 libsystem_c.dylib 0x3acabf14 pthread_cond_wait + 36
3 JavaScriptCore 0x368adc42 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 58
4 WebCore 0x38b06e88 WTF::PassOwnPtr<WebCore::StorageTask> WTF::MessageQueue<WebCore::StorageTask>::waitForMessageFilteredWithTimeout<bool ()(WebCore::StorageTask*)>(WTF::MessageQueueWaitResult&, bool (&)(WebCore::StorageTask*), double) + 52
5 WebCore 0x38b06e3c WebCore::StorageThread::threadEntryPoint() + 120
6 JavaScriptCore 0x369d1fa8 _ZN3WTFL19wtfThreadEntryPointEPv + 12
7 libsystem_c.dylib 0x3aca930e _pthread_start + 306
8 libsystem_c.dylib 0x3aca91d4 thread_start + 4
Thread 10:
0 libsystem_kernel.dylib 0x3ad50d98 __workq_kernreturn + 8
1 libsystem_c.dylib 0x3ac9ecf6 _pthread_workq_return + 14
2 libsystem_c.dylib 0x3ac9ea12 _pthread_wqthread + 362
3 libsystem_c.dylib 0x3ac9e8a0 start_wqthread + 4
Unknown thread crashed with unknown flavor: 5, state_count: 1
编辑：添加我们的AppDelegate.m功能：
//
// AppDelegate.m
// REDACTED
//
// Created by REDACTED on 5/8/13.
// Copyright (c) 2013 REDACTED. All rights reserved.
//
#import "AppDelegate.h"
#import "QSNavigationBar.h"
#import "QSUtils.h"
#import "QSInAppPurchaseHelper.h"
#import "GAI.h"
#import "Reachability.h"
#import <Crashlytics/Crashlytics.h>
@interface AppDelegate ()
@property (nonatomic, strong) Reachability* internetReach;
@end
@implementation AppDelegate
@synthesize internetReach = _internetReach;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// customize appearance
[QSInAppPurchaseHelper sharedInstance];
// plist used to populate user defaults
NSString* path = [[NSBundle mainBundle] pathForResource:@"REDACTED" ofType:@"plist"];
NSDictionary* dict = [NSDictionary dictionaryWithContentsOfFile:path];
[[NSUserDefaults standardUserDefaults] registerDefaults:dict];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
self.internetReach = [Reachability reachabilityForInternetConnection];
[self.internetReach startNotifier];
[self setReachabilityStatus:self.internetReach];
// Optional: automatically send uncaught exceptions to Google Analytics.
[GAI sharedInstance].trackUncaughtExceptions = YES;
// Optional: set Google Analytics dispatch interval to e.g. 20 seconds.
[GAI sharedInstance].dispatchInterval = 20;
// Optional: set debug to YES for extra debugging information.
[GAI sharedInstance].debug = NO;
// Create tracker instance.
id<GAITracker> tracker;
tracker = [[GAI sharedInstance] trackerWithTrackingId:@"REDACTED"];
// register to observe notifications from the icloud store
[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(storeDidChange:) name: NSUbiquitousKeyValueStoreDidChangeExternallyNotification object: [NSUbiquitousKeyValueStore defaultStore]];
// get changes that might have happened while this
// instance of your app wasn't running
[[NSUbiquitousKeyValueStore defaultStore] synchronize];
[self customizeAppearance];
[Crashlytics startWithAPIKey:@"REDACTED"];
return YES;
}
- (void)storeDidChange:(NSNotification *)notification
{
[QSUtils resolve];
[[NSNotificationCenter defaultCenter] postNotificationName:@"iCloudChange" object:nil];
}
- (void)customizeAppearance
{
[[UINavigationBar appearance] setTintColor:[UIColor darkGrayColor]];
[[UINavigationBar appearance] setBackgroundColor:[QSUtils colorFromHex:@"#333333"]];
}
- (void)reachabilityChanged:(NSNotification*)note
{
NSLog(@"!!!Reachability Changed!!!");
Reachability* curReach = [note object];
NSParameterAssert([curReach isKindOfClass:[Reachability class]]);
[self setReachabilityStatus:curReach];
[[NSNotificationCenter defaultCenter] postNotificationName:@"reachabilityChanged" object:nil];
}
- (void)setReachabilityStatus:(Reachability*)curReach
{
NetworkStatus netStatus = [curReach currentReachabilityStatus];
switch (netStatus) {
case NotReachable: {
[QSUtils setHasInternetConnection:NO];
break;
}
case ReachableViaWWAN:
case ReachableViaWiFi: {
[QSUtils setHasInternetConnection:YES];
break;
}
}
}
@end