We got crash log like this(Only crash on iOS 9):
Crashed: com.apple.main-thread EXC_BAD_ACCESS 0x00000000815fe0fd
And detail
Crashed: com.apple.main-thread
0 WebKit 0x281aa862 std::__1::__function::__func<WebKit::WebsiteDataStore::fetchData(WebKit::WebsiteDataTypes, std::__1::function<void (WTF::Vector<WebKit::WebsiteDataRecord, 0ul, WTF::CrashOnOverflow, 16ul>)>)::$_0, std::__1::allocator<WebKit::WebsiteDataStore::fetchData(WebKit::WebsiteDataTypes, std::__1::function<void (WTF::Vector<WebKit::WebsiteDataRecord, 0ul, WTF::CrashOnOverflow, 16ul>)>)::$_0>, void (WebKit::WebsiteData)>::destroy_deallocate() + 29
1 libobjc.A.dylib 0x20a37e09 object_dispose + 20
2 WebKit 0x2808fbaf std::__1::__function::__func<WebKit::NetworkProcessProxy::fetchWebsiteData(WebCore::SessionID, WebKit::WebsiteDataTypes, std::__1::function<void (WebKit::WebsiteData)>)::$_0, std::__1::allocator<WebKit::NetworkProcessProxy::fetchWebsiteData(WebCore::SessionID, WebKit::WebsiteDataTypes, std::__1::function<void (WebKit::WebsiteData)>)::$_0>, void (WebKit::WebsiteData)>::destroy_deallocate() + 30
3 WebKit 0x280518d5 WTF::HashTable<unsigned long long, WTF::KeyValuePair<unsigned long long, std::__1::function<void (WebKit::WebsiteData)> >, WTF::KeyValuePairKeyExtractor<WTF::KeyValuePair<unsigned long long, std::__1::function<void (WebKit::WebsiteData)> > >, WTF::IntHash<unsigned long long>, WTF::HashMap<unsigned long long, std::__1::function<void (WebKit::WebsiteData)>, WTF::IntHash<unsigned long long>, WTF::HashTraits<unsigned long long>, WTF::HashTraits<std::__1::function<void (WebKit::WebsiteData)> > >::KeyValuePairTraits, WTF::HashTraits<unsigned long long> >::deallocateTable(WTF::KeyValuePair<unsigned long long, std::__1::function<void (WebKit::WebsiteData)> >*, unsigned int) + 48
4 WebKit 0x2808f449 WebKit::NetworkProcessProxy::networkProcessCrashedOrFailedToLaunch() + 252
5 JavaScriptCore 0x246f7a4f WTF::RunLoop::performWork() + 310
6 JavaScriptCore 0x246f7ebb WTF::RunLoop::performWork(void*) + 22
7 CoreFoundation 0x21255dff __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
8 CoreFoundation 0x212559ed __CFRunLoopDoSources0 + 452
9 CoreFoundation 0x21253d5b __CFRunLoopRun + 794
10 CoreFoundation 0x211a3229 CFRunLoopRunSpecific + 520
11 CoreFoundation 0x211a3015 CFRunLoopRunInMode + 108
12 GraphicsServices 0x22793ac9 GSEventRunModal + 160
13 UIKit 0x25877189 UIApplicationMain + 144
14 Our App 0x7187e5 main (main.m:20)
15 libdispatch.dylib 0x20e4b873 (Missing)
We use WKWebView to show some web page. And using WKUserContentController as bridge to do some call between H5 and Native.
So, how to debug this kind of crash?
I tried to read the source code of Webkit, but it is useless. I only figure out that the WebKit network process is about to exit when crash happened.
