WKHTTPCookieStore getAllCookies crash

Question

I've got a weird crash when calling getAllCookies()

The crash is only reproducible on real device with iOS 11.3.1. On Simulator works fine.

let httpCookieStore = WKWebsiteDataStore.default().httpCookieStore
httpCookieStore.getAllCookies { (cookies) in

}

The crash in Xcode console says:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSURL length]: unrecognized selector sent to instance 0x10fc42790'

The crash on Crashlytics:

Fatal Exception: NSInvalidArgumentException
-[NSURL length]: unrecognized selector sent to instance 0x1c4466d00

Fatal Exception: NSInvalidArgumentException
0  CoreFoundation                 0x18105ed8c __exceptionPreprocess
1  libobjc.A.dylib                0x1802185ec objc_exception_throw
2  CoreFoundation                 0x18106c098 __methodDescriptionForSelector
3  CoreFoundation                 0x1810645c8 ___forwarding___
4  CoreFoundation                 0x180f4a41c _CF_forwarding_prep_0
5  CFNetwork                      0x1817a8e44 _CFStringGetOrCreateCString
6  CFNetwork                      0x181799a54 CompactHTTPCookieWithData::CompactHTTPCookieWithData(__CFDictionary const*)::PropDecanter::getEnumeratedString(unsigned int)
7  CFNetwork                      0x181798fb4 Decanter::decant(__CFAllocator const*)
8  CFNetwork                      0x18179956c CompactHTTPCookieWithData::CompactHTTPCookieWithData(__CFDictionary const*)
9  CFNetwork                      0x18164f8b0 CFHTTPCookieCreateWithProperties
10 CFNetwork                      0x18171fe58 -[NSHTTPCookie initWithProperties:]
11 CFNetwork                      0x18171fe24 +[NSHTTPCookie cookieWithProperties:]
12 WebKit                         0x190cdc598 WTF::Function<void (WTF::Vector<WebCore::Cookie, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&)>::CallableWrapper<-[WKHTTPCookieStore getAllCookies:]::$_0>::call(WTF::Vector<WebCore::Cookie, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&)
13 WebKit                         0x190b292ac WebKit::GenericCallback<WTF::Vector<WebCore::Cookie, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&>::performCallbackWithReturnValue(WTF::Vector<WebCore::Cookie, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&)
14 WebKit                         0x190b291b4 WebKit::WebCookieManagerProxy::didGetCookies(WTF::Vector<WebCore::Cookie, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebKit::CallbackID)
15 WebKit                         0x190b2bb08 void IPC::handleMessage<Messages::WebCookieManagerProxy::DidGetCookies, WebKit::WebCookieManagerProxy, void (WebKit::WebCookieManagerProxy::*)(WTF::Vector<WebCore::Cookie, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebKit::CallbackID)>(IPC::Decoder&, WebKit::WebCookieManagerProxy*, void (WebKit::WebCookieManagerProxy::*)(WTF::Vector<WebCore::Cookie, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc> const&, WebKit::CallbackID))
16 WebKit                         0x190a0a5bc IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&)
17 WebKit                         0x190a5e3c0 WebKit::NetworkProcessProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&)
18 WebKit                         0x1909cd8ec IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)
19 WebKit                         0x1909d02f4 IPC::Connection::dispatchOneMessage()
20 JavaScriptCore                 0x188663e98 WTF::RunLoop::performWork()
21 JavaScriptCore                 0x188664158 WTF::RunLoop::performWork(void*)
22 CoreFoundation                 0x181007404 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
23 CoreFoundation                 0x181006c2c __CFRunLoopDoSources0
24 CoreFoundation                 0x18100479c __CFRunLoopRun
25 CoreFoundation                 0x180f24da8 CFRunLoopRunSpecific
26 GraphicsServices               0x182f07020 GSEventRunModal
27 UIKit                          0x18af0578c UIApplicationMain
28 NAKD-InHouseProd               0x100164ea4 main (AppDelegate.swift:13)
29 libdyld.dylib                  0x1809b5fc0 start

Calling getAllCookies asynchronously in the main thread, do not solve the problem.

Answer 1

From the crash log it seems that you are accessing length property on NSURL object and that NSURL object doesn't has length property. that is the reason of crash.

It may possible that somewhere in you app you are getting string length but that object is of NSURL type. Please debug it and put exception breakpoint to identify the exact location of crash.