webCore随机崩溃，查看调用堆栈，如何调试？

Question

Iphone模拟器在线程7（Web线程）中崩溃，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 ()