我有一个非常具体的网页，导致 webview 在垃圾收集器打开时崩溃(关闭时不会崩溃)。
易于重现:创建一个文档基础应用程序，放置一个 webview，并具有以下行(可能是按钮)。
- (void)connectSearch:(id)sender
{
[[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://apple.com"]]];
}
我想这种情况只有在 Apple 为其新 iPad 做广告时才有效。页面底部有两个视频您可以观看。单击右侧的一个。播放时，单击左上角的“关闭”按钮(链接) - 该按钮会发送 #SwapViewPreviousSelection - 就这样，它崩溃了。
我刚刚了解垃圾收集器，但我怀疑收集了一些不应该收集的东西。
除了关闭垃圾收集器之外，您知道什么可以防止崩溃吗？
谢谢。
这是我得到的:
Identifier: com.yourcompany.wb
Version: 1.0 (1)
Code Type: X86-64 (Native)
Parent Process: launchd [163]
Date/Time: 2010-02-15 12:26:31.069 -0500
OS Version: Mac OS X 10.6.2 (10C540)
Report Version: 6
Interval Since Last Report: 432447 sec
Crashes Since Last Report: 7
Per-App Interval Since Last Report: 2938 sec
Per-App Crashes Since Last Report: 5
Anonymous UUID: CC123A77-1407-444A-9081-8A2B7C15C2B6
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Application Specific Information:
objc[70635]: garbage collection is ON
Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 com.apple.CoreFoundation 0x00007fff82e0a788 CFRetain + 200
1 com.apple.QuartzCore 0x00007fff81677a98 -[CALayer setSublayers:] + 486
2 com.apple.WebCore 0x00007fff87c792a1 WebCore::GraphicsLayerCA::updateSublayerList() + 433
3 com.apple.WebCore 0x00007fff87c7ebd8 WebCore::GraphicsLayerCA::commitLayerChanges() + 840
4 com.apple.WebCore 0x00007fff87c7ed05 WebCore::GraphicsLayerCA::recursiveCommitChanges() + 21
5 com.apple.WebCore 0x00007fff87c7ed31 WebCore::GraphicsLayerCA::recursiveCommitChanges() + 65
6 com.apple.WebCore 0x00007fff87705296 WebCore::FrameView::paintContents(WebCore::GraphicsContext*, WebCore::IntRect const&) + 390
7 com.apple.WebKit 0x00007fff81b3d205 -[WebFrame(WebInternal) _drawRect:contentsOnly:] + 149
8 com.apple.WebKit 0x00007fff81b3ce77 -[WebHTMLView drawSingleRect:] + 455
9 com.apple.WebKit 0x00007fff81b3cc16 -[WebHTMLView drawRect:] + 566
10 com.apple.AppKit 0x00007fff8597b05e -[NSView _drawRect:clip:] + 3566
11 com.apple.AppKit 0x00007fff85978834 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 2112
12 com.apple.WebKit 0x00007fff81b3dd6b -[WebHTMLView(WebPrivate) _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 299
13 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555
14 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555
15 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555
16 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555
17 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555
18 com.apple.AppKit 0x00007fff859791bf -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 4555
19 com.apple.AppKit 0x00007fff85977e17 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 254
20 com.apple.AppKit 0x00007fff859746bf -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2683
21 com.apple.AppKit 0x00007fff858edf37 -[NSView displayIfNeeded] + 969
22 com.apple.AppKit 0x00007fff858e8dde _handleWindowNeedsDisplay + 678
23 com.apple.CoreFoundation 0x00007fff82e74427 __CFRunLoopDoObservers + 519
24 com.apple.CoreFoundation 0x00007fff82e502d4 __CFRunLoopRun + 468
25 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575
26 com.apple.HIToolbox 0x00007fff88192a4e RunCurrentEventLoopInMode + 333
27 com.apple.HIToolbox 0x00007fff881927b1 ReceiveNextEventCommon + 148
28 com.apple.HIToolbox 0x00007fff8819270c BlockUntilNextEventMatchingListInMode + 59
29 com.apple.AppKit 0x00007fff858be1f2 _DPSNextEvent + 708
30 com.apple.AppKit 0x00007fff858bdb41 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155
31 com.apple.AppKit 0x00007fff85883747 -[NSApplication run] + 395
32 com.apple.AppKit 0x00007fff8587c468 NSApplicationMain + 364
33 com.yourcompany.wb 0x0000000100001c86 main + 33 (main.m:14)
34 com.yourcompany.wb 0x0000000100001a44 start + 52
Thread 1: Dispatch queue: com.apple.libdispatch-manager
0 libSystem.B.dylib 0x00007fff8874bbba kevent + 10
1 libSystem.B.dylib 0x00007fff8874da85 _dispatch_mgr_invoke + 154
2 libSystem.B.dylib 0x00007fff8874d75c _dispatch_queue_invoke + 185
3 libSystem.B.dylib 0x00007fff8874d286 _dispatch_worker_thread2 + 244
4 libSystem.B.dylib 0x00007fff8874cbb8 _pthread_wqthread + 353
5 libSystem.B.dylib 0x00007fff8874ca55 start_wqthread + 13
Thread 2: JavaScriptCore: FastMalloc scavenger
0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10
1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286
2 com.apple.JavaScriptCore 0x00007fff80ae62b3 WTF::TCMalloc_PageHeap::scavengerThread() + 515
3 com.apple.JavaScriptCore 0x00007fff80ae62f9 WTF::TCMalloc_PageHeap::runScavengerThread(void*) + 9
4 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
5 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 3:
0 libSystem.B.dylib 0x00007fff8874c9da __workq_kernreturn + 10
1 libSystem.B.dylib 0x00007fff8874cdec _pthread_wqthread + 917
2 libSystem.B.dylib 0x00007fff8874ca55 start_wqthread + 13
Thread 4:
0 libSystem.B.dylib 0x00007fff88732e3a mach_msg_trap + 10
1 libSystem.B.dylib 0x00007fff887334ad mach_msg + 59
2 com.apple.CoreFoundation 0x00007fff82e507a2 __CFRunLoopRun + 1698
3 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575
4 com.apple.Foundation 0x00007fff800de4cf +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 297
5 com.apple.Foundation 0x00007fff8005ee99 __NSThread__main__ + 1429
6 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
7 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 5:
0 libSystem.B.dylib 0x00007fff887769e2 select$DARWIN_EXTSN + 10
1 com.apple.CoreFoundation 0x00007fff82e72242 __CFSocketManager + 818
2 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
3 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 6:
0 libSystem.B.dylib 0x00007fff8874c9da __workq_kernreturn + 10
1 libSystem.B.dylib 0x00007fff8874cdec _pthread_wqthread + 917
2 libSystem.B.dylib 0x00007fff8874ca55 start_wqthread + 13
Thread 7:
0 libSystem.B.dylib 0x00007fff8873d426 read + 10
1 com.apple.CoreFoundation 0x00007fff82eb1ae0 __CFSocketRead + 544
2 com.apple.CFNetwork 0x00007fff88bba667 __CFSocketReadWithError(__CFSocket*, unsigned char*, long, CFStreamError*) + 35
3 com.apple.CFNetwork 0x00007fff88bba397 SocketStream::read(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 699
4 com.apple.CoreFoundation 0x00007fff82e3ffac CFReadStreamRead + 540
5 com.apple.CFNetwork 0x00007fff88bd3dc1 HTTPReadFilter::doPlainRead(unsigned char*, long, CFStreamError*, unsigned char*) + 307
6 com.apple.CFNetwork 0x00007fff88bd3c59 HTTPReadFilter::streamRead(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 469
7 com.apple.CoreFoundation 0x00007fff82e3ffac CFReadStreamRead + 540
8 com.apple.CFNetwork 0x00007fff88bd39e6 HTTPNetStreamInfo::streamRead(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 562
9 com.apple.CoreFoundation 0x00007fff82e3ffac CFReadStreamRead + 540
10 com.apple.CFNetwork 0x00007fff88c23892 HTTPReadStream::streamRead(__CFReadStream*, unsigned char*, long, CFStreamError*, unsigned char*) + 82
11 com.apple.CoreFoundation 0x00007fff82e3ffac CFReadStreamRead + 540
12 com.apple.MediaToolbox 0x00007fff86b59a6f FigCFHTTPReadResponse + 855
13 com.apple.CoreFoundation 0x00007fff82eb1503 _signalEventSync + 115
14 com.apple.CoreFoundation 0x00007fff82eb1474 _cfstream_solo_signalEventSync + 116
15 com.apple.CFNetwork 0x00007fff88c228fd HTTPReadStream::streamEvent(unsigned long) + 163
16 com.apple.CoreFoundation 0x00007fff82eb1503 _signalEventSync + 115
17 com.apple.CoreFoundation 0x00007fff82eb1474 _cfstream_solo_signalEventSync + 116
18 com.apple.CoreFoundation 0x00007fff82e52271 __CFRunLoopDoSources0 + 1361
19 com.apple.CoreFoundation 0x00007fff82e50469 __CFRunLoopRun + 873
20 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575
21 com.apple.CoreFoundation 0x00007fff82e4f9b6 CFRunLoopRun + 70
22 com.apple.CoreMedia 0x00007fff803d4702 FigThreadGlobalNetworkBufferingRunloop + 119
23 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
24 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 8:
0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10
1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286
2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14
3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167
4 com.apple.MediaToolbox 0x00007fff86aee8c7 FigAIORequestThread + 398
5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 9:
0 libSystem.B.dylib 0x00007fff8874c9da __workq_kernreturn + 10
1 libSystem.B.dylib 0x00007fff8874cdec _pthread_wqthread + 917
2 libSystem.B.dylib 0x00007fff8874ca55 start_wqthread + 13
Thread 10:
0 libSystem.B.dylib 0x00007fff88732e3a mach_msg_trap + 10
1 libSystem.B.dylib 0x00007fff887334ad mach_msg + 59
2 com.apple.CoreFoundation 0x00007fff82e507a2 __CFRunLoopRun + 1698
3 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575
4 com.apple.CoreFoundation 0x00007fff82e4f9b6 CFRunLoopRun + 70
5 com.apple.QTKit 0x00007fff830d0c49 QTFigVisualContextImageProviderWorkThread + 342
6 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
7 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 11:
0 libSystem.B.dylib 0x00007fff88732e3a mach_msg_trap + 10
1 libSystem.B.dylib 0x00007fff887334ad mach_msg + 59
2 com.apple.CoreFoundation 0x00007fff82e507a2 __CFRunLoopRun + 1698
3 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575
4 ....audio.toolbox.AudioToolbox 0x00007fff8416267a GenericRunLoopThread::RunLoop() + 42
5 ....audio.toolbox.AudioToolbox 0x00007fff841629f0 GenericRunLoopThread::Run() + 140
6 ....audio.toolbox.AudioToolbox 0x00007fff8412ded5 CAPThread::Entry(CAPThread*) + 67
7 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
8 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 12:
0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10
1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286
2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14
3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167
4 com.apple.MediaToolbox 0x00007fff86afd4dd faq_EnqueueSourceDataThread + 44
5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 13:
0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10
1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286
2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14
3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167
4 com.apple.MediaToolbox 0x00007fff86b9b03b activitySchedulerOnThread + 69
5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 14:
0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10
1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286
2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14
3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167
4 com.apple.MediaToolbox 0x00007fff86b26d49 audioMentorThread + 6000
5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 15:
0 libSystem.B.dylib 0x00007fff8876d9ee __semwait_signal + 10
1 libSystem.B.dylib 0x00007fff887717f1 _pthread_cond_wait + 1286
2 com.apple.CoreMedia 0x00007fff803d5947 WaitOnCondition + 14
3 com.apple.CoreMedia 0x00007fff803d5b13 FigSemaphoreWaitRelative + 167
4 com.apple.MediaToolbox 0x00007fff86b3003a videoMentorThread + 5700
5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 16:
0 libSystem.B.dylib 0x00007fff88732e3a mach_msg_trap + 10
1 libSystem.B.dylib 0x00007fff887334ad mach_msg + 59
2 com.apple.CoreFoundation 0x00007fff82e507a2 __CFRunLoopRun + 1698
3 com.apple.CoreFoundation 0x00007fff82e4fc2f CFRunLoopRunSpecific + 575
4 com.apple.CoreFoundation 0x00007fff82e4f9b6 CFRunLoopRun + 70
5 com.apple.QTKit 0x00007fff830cfad4 QTCALayerRendererPendingQWorkLoop + 534
6 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
7 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 17:
0 libSystem.B.dylib 0x00007fff88732e76 semaphore_wait_trap + 10
1 com.apple.VideoToolbox 0x00007fff80487f25 JVTLib_100988 + 11
2 com.apple.VideoToolbox 0x00007fff804d61d8 JVTLib_101021(void*) + 60
3 com.apple.VideoToolbox 0x00007fff804882f4 JVTLib_100971 + 552
4 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
5 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 18:
0 libSystem.B.dylib 0x00007fff88732e76 semaphore_wait_trap + 10
1 com.apple.VideoToolbox 0x00007fff80487f25 JVTLib_100988 + 11
2 com.apple.VideoToolbox 0x00007fff804d61d8 JVTLib_101021(void*) + 60
3 com.apple.VideoToolbox 0x00007fff804882f4 JVTLib_100971 + 552
4 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
5 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 19:
0 libSystem.B.dylib 0x00007fff88732e9a semaphore_timedwait_signal_trap + 10
1 libSystem.B.dylib 0x00007fff887716e2 _pthread_cond_wait + 1015
2 com.apple.CoreVideo 0x00007fff83d2988c CVDisplayLink::waitUntil(unsigned long long) + 252
3 com.apple.CoreVideo 0x00007fff83d28d91 CVDisplayLink::runIOThread() + 619
4 com.apple.CoreVideo 0x00007fff83d28aeb startIOThread(void*) + 139
5 libSystem.B.dylib 0x00007fff8876bf8e _pthread_start + 331
6 libSystem.B.dylib 0x00007fff8876be41 thread_start + 13
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x0000000000000000 rcx: 0x0000000000000000 rdx: 0x0000000000000018
rdi: 0x0000000000000000 rsi: 0x000000020070f7d8 rbp: 0x00007fff5fbfbcf0 rsp: 0x00007fff5fbfbce0
r8: 0x00000001010e48d0 r9: 0x000000000000f740 r10: 0x00000001010e42f0 r11: 0x00007fff87d9ca50
r12: 0x0000000101238600 r13: 0x0000000000000000 r14: 0x000000020070f7c0 r15: 0x0000000000000000
rip: 0x00007fff82e0a788 rfl: 0x0000000000000246 cr2: 0x00007fff702c13c8
最佳答案
您问题中的堆栈跟踪证明了 WebKit 中已知(且已修复)的错误
关于cocoa - 垃圾收集器开启时 Webview 崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2267549/