iOS uiwebview se bloquea en WebThread

Question

Estoy buscando algún consejo o ayuda para diagnosticar este choque que estoy viendo. Por el momento, creo que es probablemente un error del webkit, pero todo es posible, así que por favor proporcione cualquier información que pueda tener:

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: ...

Hice una investigación adicional sobre el seguimiento de la pila y encontré el código para Subresourceloader aquí ( https://webkit.googlesource.com/WebKit/+/master/Source/WebCore/loader/SubresourceLoader.cpp ).

Mi conjetura es que m_resource es NULL en este punto marcado con (****) causando el bloqueo:

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);
    }
...

Answer 1

Si funcionó después de una reinstalación, entonces podría intentar realizar la solicitud de URL sin almacenamiento en caché, ya que asumo que dará el mismo resultado:

NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData timeoutInterval:30];
[webView loadRequest:request];

Supongo que algo va mal con el almacenamiento en caché de un recurso.