Iphone模拟器在线程7（网络线程）崩溃，应用程序使用webview，使用phoneGap与其他视图交互。
基于XCode 4.2。
#0 0x05841d8a in WebCore::ApplicationCacheGroup::disassociateDocumentLoader ()
#1 0x056879fa in WebCore::ApplicationCacheHost::~ApplicationCacheHost ()
#2 0x0568714f in WebCore::DocumentLoader::~DocumentLoader ()
#3 0x053decb0 in WebDocumentLoaderMac::~WebDocumentLoaderMac ()
#4 0x0579f405 in WebCore::FrameLoader::detachViewsAndDocumentLoader ()
#5 0x0577a542 in WebCore::FrameLoader::detachFromParent ()
#6 0x054414d1 in -[WebView(WebPrivate) _close] ()
#7 0x0459567d in __invoking___ ()
#8 0x04595551 in -[NSInvocation invoke] ()
#9 0x055983c3 in HandleAPISource ()
#10 0x0460601f in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ ()
#11 0x0456419d in __CFRunLoopDoSources0 ()
#12 0x04563786 in __CFRunLoopRun ()
#13 0x04563240 in CFRunLoopRunSpecific ()
#14 0x04563161 in CFRunLoopRunInMode ()
#15 0x05659423 in RunWebThread ()
#16 0x98305259 in _pthread_start ()
#17 0x983050de in thread_start ()