项目开发中遇到这个问题，在iphone5c iOS9 上，多次打开webView就会闪退。不过前提这个webView加载的内容要复杂一些，占用内存多一些。项目用的mrc，请教下 这个crash要怎么解决？
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0xbbadbeef
Triggered by Thread: 7
Thread 7 name: WebThread
Thread 7 Crashed:
0 JavaScriptCore 0x23dee1b4 bmalloc::VMHeap::grow() + 116
1 JavaScriptCore 0x23ded11a bmalloc::Heap::allocateLarge(std::__1::lock_guard<bmalloc::StaticMutex>&, unsigned long) + 78
2 JavaScriptCore 0x23deb7de bmalloc::Allocator::allocateLarge(unsigned long) + 86
3 JavaScriptCore 0x23a3153e WTF::tryFastMalloc(unsigned long) + 30
4 WebCore 0x320aee4c WTF::RefPtr<WTF::StringImpl> WTF::tryMakeString<WTF::String, WTF::String>(WTF::String, WTF::String) + 108
5 WebCore 0x31897556 WTF::StringAppend<WTF::String, WTF::String>::operator WTF::String() const + 46
6 WebCore 0x322690ae WebCore::TextResourceDecoder::decodeAndFlush(char const*, unsigned long) + 110
7 WebCore 0x3180e708 WebCore::CachedScript::script() + 48