iOS崩溃与javascript核心，网络线程有关

在ios11中发生了大量崩溃，如下所示：webkit框架包含在项目中。 任何想法可能是这次崩溃的原因？

Crashed: WebThread 0 JavaScriptCore 0x18bdbeebc bmalloc::Heap::allocateSmallChunk(std::__1::lock_guard&, unsigned long) + 680 1 JavaScriptCore 0x18bdbec70 bmalloc::Heap::allocateSmallChunk(std::__1::lock_guard&, unsigned long) + 92 2 JavaScriptCore 0x18bdbef58 bmalloc::Heap::allocateSmallPage(std::__1::lock_guard&, unsigned long, std::__1::array<bmalloc::List, 112ul>&) + 152 3 JavaScriptCore 0x18bdbf45c bmalloc::Heap::allocateSmallBumpRangesByObject(std::__1::lock_guard&, unsigned long, bmalloc::BumpAllocator&, bmalloc::FixedVector&, std::__1::array<bmalloc::List, 112ul>&) + 52 4 JavaScriptCore 0x18bdbd228 bmalloc::Allocator::refillAllocatorSlowCase(bmalloc::BumpAllocator&, unsigned long) + 160 5 JavaScriptCore 0x18bdbd358 bmalloc::Allocator::allocateLogSizeClass(unsigned long) + 160 6 JavaScriptCore 0x18bba1cec JSC::MarkedBlock::tryCreate(JSC::Heap&) + 36 7 JavaScriptCore 0x18bba10c0 JSC::MarkedAllocator::allocateSlowCaseImpl(JSC::GCDeferralContext*, bool) + 368 8 JavaScriptCore 0x18bce69d0 JSC::Subspace::allocate(unsigned long) + 152 9 JavaScriptCore 0x18bcfb7a0 JSC::UnlinkedFunctionExecutable::link(JSC::VM&, JSC::SourceCode const&, std::optional, JSC::Intrinsic) + 236 10 JavaScriptCore 0x18b6c9b98 JSC::CodeBlock::finishCreation(JSC::VM&, JSC::ScriptExecutable*, JSC::UnlinkedCodeBlock*, JSC::JSScope*) + 1964 11 JavaScriptCore 0x18bcb9f64 JSC::ScriptExecutable::newCodeBlockFor(JSC::CodeSpecializationKind, JSC::JSFunction*, JSC::JSScope*, JSC::JSObject*&) + 1088 12 JavaScriptCore 0x18bcba384 JSC::ScriptExecutable::prepareForExecutionImpl(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) + 240 13 JavaScriptCore 0x18b454718 JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) + 672 14 JavaScriptCore 0x18bb9b444 llint_entry + 26996 15 JavaScriptCore 0x18bb94900 vmEntryToJavaScript + 272 16 JavaScriptCore 0x18ba73190 JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 184 17 JavaScriptCore 0x18ba47af4 JSC::Interpreter::executeProgram(JSC::SourceCode const&, JSC::ExecState*, JSC::JSObject*) + 12168 18 JavaScriptCore 0x18b7108e8 JSC::evaluate(JSC::ExecState*, JSC::SourceCode const&, JSC::JSValue, WTF::NakedPtr&) + 340 19 WebCore 0x18d77fe4c WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld&, WebCore::ExceptionDetails*) + 324 20 WebCore 0x18d786458 WebCore::ScriptElement::executeClassicScript(WebCore::ScriptSourceCode const&) + 584 21 WebCore 0x18d4c5750 WebCore::LoadableClassicScript::execute(WebCore::ScriptElement&) + 164 22 WebCore 0x18d7866fc WebCore::ScriptElement::executeScriptAndDispatchEvent(WebCore::LoadableScript&) + 216 23 WebCore 0x18d78ce0c WebCore::ScriptRunner::timerFired() + 456 24 WebCore 0x18c85b000 WebCore::ThreadTimers::sharedTimerFiredInternal() + 172 25 WebCore 0x18c85af40 WebCore::timerFired(__CFRunLoopTimer*, void*) + 28 26 CoreFoundation 0x1849fefc0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 28 27 CoreFoundation 0x1849fece4 __CFRunLoopDoTimer + 864 28 CoreFoundation 0x1849fe4e4 __CFRunLoopDoTimers + 248 29 CoreFoundation 0x1849fc0cc __CFRunLoopRun + 1928 30 CoreFoundation 0x18491be58 CFRunLoopRunSpecific + 436 31 WebCore 0x18c88ca34 RunWebThread(void*) + 560 32 libsystem_pthread.dylib 0x18467c2b4 _pthread_body + 308 33 libsystem_pthread.dylib 0x18467c180 _pthread_body + 310 34 libsystem_pthread.dylib 0x18467ab74 thread_start + 4