WebCore 的崩溃是不是意味着它必然与 UIWebView 相关？
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【中文标题】WebCore 的崩溃是不是意味着它必然与 UIWebView 相关？【英文标题】：Does a crash of WebCore mean it is necessarily related to a UIWebView?WebCore 的崩溃是否意味着它必然与 UIWebView 相关？ 【发布时间】：2012-08-12 13:04:03 【问题描述】：我的应用广泛使用 UIWebView，因为它本质上是一个基于 WebView 的应用。
在应用程序的左侧，我有一个滑出菜单，类似于 Facebook 和 Path 应用程序。选择其中一个表格行会将主 web 视图滑回并加载 URL。
我已经从 Web 线程中看到了 WebCore 的随机崩溃，但我根本无法理解如何解决它。我测试了僵尸和内存分配，但应用程序始终保持在 3-4MB 的活动字节内。
我不知道它是否相关，但是当 webview 加载它的页面时有很大的“钩子”。例如，在 shouldStartLoad 中，我检查某些 URL，然后在页面上调用 JS 函数。我不知道这是否会导致崩溃。
崩溃日志显示 webcore 崩溃的不同区域。我在下面添加了一些最新的变体，但我不确定这些是所有可能的变体。
简而言之，什么是 WebCore 崩溃？它是 UIWebView 中的一个我无能为力的错误吗？谢谢！
Thread 2 name: WebThread
Thread 2 Crashed:
0 WebCore 0x32c540c0 WebCore::Document::body() const + 4
1 WebCore 0x32d04052 WebCore::CachedResourceLoader::preload(WebCore::CachedResource::Type, WTF::String const&, WTF::String const&, bool) + 18
2 WebCore 0x32d03ebe WebCore::htmlPreloadScanner::processToken() + 1510
3 WebCore 0x32d03872 WebCore::HTMLPreloadScanner::scan() + 42
4 WebCore 0x32cebc24 WebCore::HTMLDocumentParser::append(WebCore::SegmentedString const&) + 92
5 WebCore 0x32cbce20 WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter*, char const*, int, bool) + 200
6 WebCore 0x32ceb8d0 WebCore::DocumentWriter::addData(char const*, int, bool) + 48
7 WebCore 0x32ce5c3e WebCore::DocumentLoader::commitData(char const*, int) + 122
8 WebKit 0x358cbc9a -[WebHTMLRepresentation receivedData:withDataSource:] + 158
9 WebKit 0x358cbb10 -[WebDataSource(WebInternal) _receivedData:] + 164
10 WebKit 0x358cba48 WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) + 100
11 WebCore 0x32ce2a48 WebCore::DocumentLoader::commitLoad(char const*, int) + 120
12 WebCore 0x32ce29b4 WebCore::DocumentLoader::receivedData(char const*, int) + 72
13 WebCore 0x32ce25da WebCore::ResourceLoader::didReceiveData(char const*, int, long long, bool) + 34
14 WebCore 0x32ce2566 WebCore::MainResourceLoader::didReceiveData(char const*, int, long long, bool) + 474
15 WebCore 0x32ce22b2 WebCore::ResourceLoader::didReceiveData(WebCore::ResourceHandle*, char const*, int, int) + 42
16 WebCore 0x32ce2234 WebCore::ResourceHandle::handleDataArray(__CFArray const*) + 212
17 WebCore 0x32ce2156 WebCore::didReceiveDataArray(_CFURLConnection*, __CFArray const*, void const*) + 34
18 CFNetwork 0x370dd058 URLConnectionClient::_clientDidReceiveData(__CFArray const*, URLConnectionClient::ClientConnectionEventQueue*) + 220
19 CFNetwork 0x370434b0 URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayload(XConnectionEventInfo<XClientEvent, XClientEventParams>*, long) + 436
20 CFNetwork 0x3704319c URLConnectionClient::processEvents() + 100
21 CFNetwork 0x370430d2 MultiplexerSource::perform() + 150
22 CoreFoundation 0x3738aacc __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 8
23 CoreFoundation 0x3738a32e __CFRunLoopDoSources0 + 358
24 CoreFoundation 0x3738903e __CFRunLoopRun + 646
25 CoreFoundation 0x3730c49e CFRunLoopRunSpecific + 294
26 CoreFoundation 0x3730c366 CFRunLoopRunInMode + 98
27 WebCore 0x32cb5c9c RunWebThread(void*) + 396
28 libsystem_c.dylib 0x33c2b72e _pthread_start + 314
29 libsystem_c.dylib 0x33c2b5e8 thread_start + 0
或
Thread 2 name: WebThread
Thread 2 Crashed:
0 WebCore 0x32cbe120 WebCore::HTMLDocumentParser::pumpTokenizer(WebCore::HTMLDocumentParser::SynchronousMode) + 312
1 WebCore 0x32cebc66 WebCore::HTMLDocumentParser::append(WebCore::SegmentedString const&) + 158
2 WebCore 0x32cbce20 WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter*, char const*, int, bool) + 200
3 WebCore 0x32ceb8d0 WebCore::DocumentWriter::addData(char const*, int, bool) + 48
4 WebCore 0x32ce5c3e WebCore::DocumentLoader::commitData(char const*, int) + 122
5 WebKit 0x358cbc9a -[WebHTMLRepresentation receivedData:withDataSource:] + 158
6 WebKit 0x358cbb10 -[WebDataSource(WebInternal) _receivedData:] + 164
7 WebKit 0x358cba48 WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) + 100
8 WebCore 0x32ce2a48 WebCore::DocumentLoader::commitLoad(char const*, int) + 120
9 WebCore 0x32ce29b4 WebCore::DocumentLoader::receivedData(char const*, int) + 72
10 WebCore 0x32ce25da WebCore::ResourceLoader::didReceiveData(char const*, int, long long, bool) + 34
11 WebCore 0x32ce2566 WebCore::MainResourceLoader::didReceiveData(char const*, int, long long, bool) + 474
12 WebCore 0x32ce22b2 WebCore::ResourceLoader::didReceiveData(WebCore::ResourceHandle*, char const*, int, int) + 42
13 WebCore 0x32ce2276 WebCore::ResourceHandle::handleDataArray(__CFArray const*) + 278
14 WebCore 0x32ce2156 WebCore::didReceiveDataArray(_CFURLConnection*, __CFArray const*, void const*) + 34
15 CFNetwork 0x370dd058 URLConnectionClient::_clientDidReceiveData(__CFArray const*, URLConnectionClient::ClientConnectionEventQueue*) + 220
16 CFNetwork 0x370434b0 URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayload(XConnectionEventInfo<XClientEvent, XClientEventParams>*, long) + 436
17 CFNetwork 0x37043592 URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayload(XConnectionEventInfo<XClientEvent, XClientEventParams>*, long) + 662
18 CFNetwork 0x3704319c URLConnectionClient::processEvents() + 100
19 CFNetwork 0x370430d2 MultiplexerSource::perform() + 150
20 CoreFoundation 0x3738aacc __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 8
21 CoreFoundation 0x3738a298 __CFRunLoopDoSources0 + 208
22 CoreFoundation 0x3738903e __CFRunLoopRun + 646
23 CoreFoundation 0x3730c49e CFRunLoopRunSpecific + 294
24 CoreFoundation 0x3730c366 CFRunLoopRunInMode + 98
25 WebCore 0x32cb5c9c RunWebThread(void*) + 396
26 libsystem_c.dylib 0x33c2b72e _pthread_start + 314
27 libsystem_c.dylib 0x33c2b5e8 thread_start + 0
或
Thread 2 name: WebThread
Thread 2 Crashed:
0 javascriptCore 0x35653c7c WTF::fastFree(void*) + 80
1 WebCore 0x32d064b4 WebCore::SegmentedString::prepend(WebCore::SegmentedSubstring const&) + 136
2 WebCore 0x32d0640e WebCore::SegmentedString::prepend(WebCore::SegmentedString const&) + 66
3 WebCore 0x32d047a8 WebCore::(anonymous namespace)::unconsumeCharacters(WebCore::SegmentedString&, WTF::Vector<unsigned short, 10ul> const&) + 188
4 WebCore 0x32cf023e WebCore::consumeHTMLEntity(WebCore::SegmentedString&, WTF::Vector<unsigned short, 16ul>&, bool&, unsigned short) + 1850
5 WebCore 0x32cef9e4 WebCore::HTMLTokenizer::processEntity(WebCore::SegmentedString&) + 40
6 WebCore 0x32cbebe8 WebCore::HTMLTokenizer::nextToken(WebCore::SegmentedString&, WebCore::HTMLToken&) + 1232
7 WebCore 0x32d03894 WebCore::HTMLPreloadScanner::scan() + 76
8 WebCore 0x32cebc24 WebCore::HTMLDocumentParser::append(WebCore::SegmentedString const&) + 92
9 WebCore 0x32cbce20 WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter*, char const*, int, bool) + 200
10 WebCore 0x32ceb8d0 WebCore::DocumentWriter::addData(char const*, int, bool) + 48
11 WebCore 0x32ce5c3e WebCore::DocumentLoader::commitData(char const*, int) + 122
12 WebKit 0x358cbc9a -[WebHTMLRepresentation receivedData:withDataSource:] + 158
13 WebKit 0x358cbb10 -[WebDataSource(WebInternal) _receivedData:] + 164
14 WebKit 0x358cba48 WebFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, char const*, int) + 100
15 WebCore 0x32ce2a48 WebCore::DocumentLoader::commitLoad(char const*, int) + 120
16 WebCore 0x32ce29b4 WebCore::DocumentLoader::receivedData(char const*, int) + 72
17 WebCore 0x32ce25da WebCore::ResourceLoader::didReceiveData(char const*, int, long long, bool) + 34
18 WebCore 0x32ce2566 WebCore::MainResourceLoader::didReceiveData(char const*, int, long long, bool) + 474
19 WebCore 0x32ce22b2 WebCore::ResourceLoader::didReceiveData(WebCore::ResourceHandle*, char const*, int, int) + 42
20 WebCore 0x32ce2276 WebCore::ResourceHandle::handleDataArray(__CFArray const*) + 278
21 WebCore 0x32ce2156 WebCore::didReceiveDataArray(_CFURLConnection*, __CFArray const*, void const*) + 34
22 CFNetwork 0x370dd058 URLConnectionClient::_clientDidReceiveData(__CFArray const*, URLConnectionClient::ClientConnectionEventQueue*) + 220
23 CFNetwork 0x370434b0 URLConnectionClient::ClientConnectionEventQueue::processAllEventsAndConsumePayload(XConnectionEventInfo<XClientEvent, XClientEventParams>*, long) + 436
24 CFNetwork 0x3704319c URLConnectionClient::processEvents() + 100
25 CFNetwork 0x370430d2 MultiplexerSource::perform() + 150
26 CoreFoundation 0x3738aacc __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 8
27 CoreFoundation 0x3738a32e __CFRunLoopDoSources0 + 358
28 CoreFoundation 0x3738903e __CFRunLoopRun + 646
29 CoreFoundation 0x3730c49e CFRunLoopRunSpecific + 294
30 CoreFoundation 0x3730c366 CFRunLoopRunInMode + 98
31 WebCore 0x32cb5c9c RunWebThread(void*) + 396
32 libsystem_c.dylib 0x33c2b72e _pthread_start + 314
33 libsystem_c.dylib 0x33c2b5e8 thread_start + 0
【问题讨论】：
【参考方案1】：WebThread 由 WebKit 管理，没有开发者拥有的代码在其中运行。我想知道，它可以在较新的 ios 固件上重现吗？你可以提交一份关于这个的雷达报告。
【讨论】：
我测试的开发环境是 Xcode 4.4.1 和 iOS 5.1.1。我刚刚在 iphone 3gs 上安装了 Xcode 4.5DP4 和 iOS6.0 beta 以查看那里是否发生崩溃。但是，对于 WebCore 崩溃的原因，是否有一个通用的答案？是因为网页本身的 HTML/JS 错误/不兼容吗？它是 WebCore 中的错误吗？我以前从未见过这些错误，所以我很迷茫...... 这是 WebKit 中的一个错误。你不应该对 WebKit 有那么大的“影响”让它崩溃。以上是关于WebCore 的崩溃是不是意味着它必然与 UIWebView 相关？的主要内容，如果未能解决你的问题，请参考以下文章
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