我正在寻找一些建议或帮助诊断我看到的这次崩溃。目前，我认为它可能是一个webkit错误，但一切皆有可能，所以请提供您可能有的任何见解：
Incident Identifier: AEB8EE37-E5D4-4975-97F4-2B2038AC225A
CrashReporter Key: 92349a05395ea832c40c49c9e48997c1d65a2371
Hardware Model: iPad3,3
Process: Touch [242]
Path: /var/mobile/Applications/4D2CAEEE-D0F8-4BB4-989A-F8623C877C78/Touch.app/Touch
Identifier: StayinFrontTouch
Version: 3.2.40 (3.2.40)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2014-04-30 15:26:46.137 +1200
OS Version: iOS 7.1.1 (11D201)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000258
Triggered by Thread: 2
Thread 0:
0 libsystem_kernel.dylib 0x3a2ffa58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3a2ff854 mach_msg + 44
2 CoreFoundation 0x2f06e896 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2f06d002 __CFRunLoopRun + 850
4 CoreFoundation 0x2efd7f0a CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2efd7cee CFRunLoopRunInMode + 102
6 GraphicsServices 0x33f0a65e GSEventRunModal + 134
7 UIKit 0x31923168 UIApplicationMain + 1132
8 Touch 0x000c064a 0xbd000 + 13898
9 Touch 0x000bf854 0xbd000 + 10324
Thread 1:
0 libsystem_kernel.dylib 0x3a2ff808 kevent64 + 24
1 libdispatch.dylib 0x3a241078 _dispatch_mgr_invoke + 228
2 libdispatch.dylib 0x3a240dfe _dispatch_mgr_thread$VARIANT$mp + 34
Thread 2 name: WebThread
Thread 2 Crashed:
0 WebCore 0x37584302 WebCore::SubresourceLoader::didReceiveResponse(WebCore::ResourceResponse const&) + 26
1 WebCore 0x377f751c WebCore::DocumentLoader::substituteResourceDeliveryTimerFired(WebCore::Timer*) + 212
2 WebCore 0x374ad3f4 WebCore::ThreadTimers::sharedTimerFiredInternal() + 132
3 WebCore 0x374ad346 WebCore::timerFired(__CFRunLoopTimer*, void*) + 22
4 CoreFoundation 0x2f06f1b4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 12
5 CoreFoundation 0x2f06edca __CFRunLoopDoTimer + 778
6 CoreFoundation 0x2f06d166 __CFRunLoopRun + 1206
7 CoreFoundation 0x2efd7f0a CFRunLoopRunSpecific + 518
8 CoreFoundation 0x2efd7cee CFRunLoopRunInMode + 102
9 WebCore 0x3753a116 RunWebThread(void*) + 414
10 libsystem_pthread.dylib 0x3a37b916 _pthread_body + 138
11 libsystem_pthread.dylib 0x3a37b886 _pthread_start + 98
12 libsystem_pthread.dylib 0x3a379aa0 thread_start + 4
Thread 3 name: com.apple.NSURLConnectionLoader
Thread 3:
0 libsystem_kernel.dylib 0x3a2ffa58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3a2ff854 mach_msg + 44
2 CoreFoundation 0x2f06e896 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2f06cfbc __CFRunLoopRun + 780
4 CoreFoundation 0x2efd7f0a CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2efd7cee CFRunLoopRunInMode + 102
6 Foundation 0x2fa17082 +[NSURLConnection(Loader) _resourceLoadLoop:] + 314
7 Foundation 0x2fa8ca5a __NSThread__main__ + 1058
8 libsystem_pthread.dylib 0x3a37b916 _pthread_body + 138
9 libsystem_pthread.dylib 0x3a37b886 _pthread_start + 98
10 libsystem_pthread.dylib 0x3a379aa0 thread_start + 4
Thread 4:
0 libsystem_kernel.dylib 0x3a2ffa58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3a2ff854 mach_msg + 44
2 CoreFoundation 0x2f06e896 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2f06cfbc __CFRunLoopRun + 780
4 CoreFoundation 0x2efd7f0a CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2efd7cee CFRunLoopRunInMode + 102
6 libAVFAudio.dylib 0x2e04f44c GenericRunLoopThread::Entry(void*) + 124
7 libAVFAudio.dylib 0x2e0437bc CAPThread::Entry(CAPThread*) + 176
8 libsystem_pthread.dylib 0x3a37b916 _pthread_body + 138
9 libsystem_pthread.dylib 0x3a37b886 _pthread_start + 98
10 libsystem_pthread.dylib 0x3a379aa0 thread_start + 4
Thread 5 name: JavaScriptCore::BlockFree
Thread 5:
0 libsystem_kernel.dylib 0x3a311f2c __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x3a37af22 _pthread_cond_wait + 518
2 libsystem_pthread.dylib 0x3a37bd60 pthread_cond_wait + 36
3 JavaScriptCore 0x30004ee4 JSC::BlockAllocator::blockFreeingThreadMain() + 204
4 JavaScriptCore 0x30002538 WTF::wtfThreadEntryPoint(void*) + 12
5 libsystem_pthread.dylib 0x3a37b916 _pthread_body + 138
6 libsystem_pthread.dylib 0x3a37b886 _pthread_start + 98
7 libsystem_pthread.dylib 0x3a379aa0 thread_start + 4
Thread 6 name: JavaScriptCore::Marking
Thread 6:
0 libsystem_kernel.dylib 0x3a311f2c __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x3a37af22 _pthread_cond_wait + 518
2 libsystem_pthread.dylib 0x3a37bd60 pthread_cond_wait + 36
3 JavaScriptCore 0x301a0406 JSC::GCThread::waitForNextPhase() + 74
4 JavaScriptCore 0x301a0460 JSC::GCThread::gcThreadMain() + 48
5 JavaScriptCore 0x30002538 WTF::wtfThreadEntryPoint(void*) + 12
6 libsystem_pthread.dylib 0x3a37b916 _pthread_body + 138
7 libsystem_pthread.dylib 0x3a37b886 _pthread_start + 98
8 libsystem_pthread.dylib 0x3a379aa0 thread_start + 4
Thread 7 name: WebCore: CFNetwork Loader
Thread 7:
0 libsystem_kernel.dylib 0x3a2ffa58 mach_msg_trap + 20
1 libsystem_kernel.dylib 0x3a2ff854 mach_msg + 44
2 CoreFoundation 0x2f06e896 __CFRunLoopServiceMachPort + 150
3 CoreFoundation 0x2f06cfbc __CFRunLoopRun + 780
4 CoreFoundation 0x2efd7f0a CFRunLoopRunSpecific + 518
5 CoreFoundation 0x2efd7cee CFRunLoopRunInMode + 102
6 WebCore 0x37582b12 WebCore::runLoaderThread(void*) + 250
7 JavaScriptCore 0x30002538 WTF::wtfThreadEntryPoint(void*) + 12
8 libsystem_pthread.dylib 0x3a37b916 _pthread_body + 138
9 libsystem_pthread.dylib 0x3a37b886 _pthread_start + 98
10 libsystem_pthread.dylib 0x3a379aa0 thread_start + 4
Thread 8 name: com.apple.CFSocket.private
Thread 8:
0 libsystem_kernel.dylib 0x3a312434 __select + 20
1 CoreFoundation 0x2f072758 __CFSocketManager + 480
2 libsystem_pthread.dylib 0x3a37b916 _pthread_body + 138
3 libsystem_pthread.dylib 0x3a37b886 _pthread_start + 98
4 libsystem_pthread.dylib 0x3a379aa0 thread_start + 4
Thread 9 name: WebCore: LocalStorage
Thread 9:
0 libsystem_kernel.dylib 0x3a311f2c __psynch_cvwait + 24
1 libsystem_pthread.dylib 0x3a37af22 _pthread_cond_wait + 518
2 libsystem_pthread.dylib 0x3a37bd60 pthread_cond_wait + 36
3 JavaScriptCore 0x30005012 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 58
4 WebCore 0x3766cf2c WTF::PassOwnPtr > WTF::MessageQueue >::waitForMessageFilteredWithTimeout*)>(WTF::MessageQueueWaitResult&, bool (&)(WTF::Function*), double) + 104
5 WebCore 0x3766ceb2 WebCore::StorageThread::threadEntryPoint() + 162
6 JavaScriptCore 0x30002538 WTF::wtfThreadEntryPoint(void*) + 12
7 libsystem_pthread.dylib 0x3a37b916 _pthread_body + 138
8 libsystem_pthread.dylib 0x3a37b886 _pthread_start + 98
9 libsystem_pthread.dylib 0x3a379aa0 thread_start + 4
Thread 10:
0 libsystem_kernel.dylib 0x3a312c70 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3a379bda _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3a379a94 start_wqthread + 4
Thread 11:
0 libsystem_kernel.dylib 0x3a312c70 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3a379bda _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3a379a94 start_wqthread + 4
Thread 12:
0 libsystem_kernel.dylib 0x3a312c70 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3a379bda _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3a379a94 start_wqthread + 4
Thread 13:
0 libsystem_kernel.dylib 0x3a312c70 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3a379bda _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3a379a94 start_wqthread + 4
Thread 14:
0 libsystem_kernel.dylib 0x3a312c70 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3a379bda _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3a379a94 start_wqthread + 4
Thread 15:
0 libsystem_kernel.dylib 0x3a312c70 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x3a379bda _pthread_wqthread + 306
2 libsystem_pthread.dylib 0x3a379a94 start_wqthread + 4
Thread 2 crashed with ARM Thread State (32-bit):
r0: 0x00000000 r1: 0x04ee0238 r2: 0x375842e9 r3: 0x019cb6b8
r4: 0x0a916c00 r5: 0x04ee0238 r6: 0x0a916c00 r7: 0x01bbf028
r8: 0x0549ea00 r9: 0x00000002 r10: 0x0549e9c8 r11: 0x03bc3000
ip: 0x3a6c7838 sp: 0x01bbf014 lr: 0x377f751f pc: 0x37584302
cpsr: 0x20000030
Binary Images:
...
我对堆栈跟踪做了一些进一步的调查，并在这里找到了Subresourceloader的代码（https://webkit.googlesource.com/WebKit/+/master/Source/WebCore/loader/SubresourceLoader.cpp）。
我的猜测是，此时m_resource为NULL，标记为（****）导致崩溃：
void SubresourceLoader::didReceiveResponse(const ResourceResponse& response)
{
ASSERT(!response.isNull());
ASSERT(m_state == Initialized);
// Reference the object in this method since the additional processing can do
// anything including removing the last reference to this object; one example of this is 3266216.
Ref<SubresourceLoader> protect(*this);
if (m_resource->resourceToRevalidate()) { ****
if (response.httpStatusCode() == 304) {
// 304 Not modified / Use local copy
// Existing resource is ok, just use it updating the expiration time.
m_resource->setResponse(response);
memoryCache()->revalidationSucceeded(m_resource, response);
if (!reachedTerminalState())
ResourceLoader::didReceiveResponse(response);
return;
}
// Did not get 304 response, continue as a regular resource load.
memoryCache()->revalidationFailed(m_resource);
}
...
答案 0 :(得分：5)
如果在重新安装后它可以工作，那么你可以尝试在没有缓存的情况下执行URL请求，因为我认为这会产生相同的结果：
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:30];
[webView loadRequest:request];
我猜测资源的缓存有问题。