I need help in understanding this crash log from a test user. I did not write any JavaScriptCore related code in my app.
I still don't know how to reproduce this crash. Any insights about this problem would be helpful to me in finding this problem.
Thanks,
P.S My app is using Admob mediation. I don't know if it has some relation about this.
Incident Identifier: 7B6EFFFF-4D55-48AE-8FE8-A55590405F0A
CrashReporter Key: ef1ad783966254a93308221f30f17134c95879f7
Hardware Model: iPad5,3
Process: ???? [2325]
Path: /private/var/mobile/Containers/Bundle/Application/16AE72E1-A8C8-45D9-955F-A6F96FCCE800/????.app/????
Identifier: ????
Version: 3.75.14 (3.75)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
Date/Time: 2015-05-16 10:36:50.459 -0700
Launch Time: 2015-05-16 10:00:10.481 -0700
OS Version: iOS 8.3 (12F69)
Report Version: 105
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000000bbadbeef
Triggered by Thread: 4
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x0000000197080e0c mach_msg_trap + 8
1 libsystem_kernel.dylib 0x0000000197080c84 mach_msg + 68
2 CoreFoundation 0x00000001852fb720 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x00000001852f9674 __CFRunLoopRun + 936
4 CoreFoundation 0x00000001852252d0 CFRunLoopRunSpecific + 392
5 GraphicsServices 0x000000018e9036f8 GSEventRunModal + 164
6 UIKit 0x0000000189deafa8 UIApplicationMain + 1484
7 ClockXtrm 0x000000010004f668 main (main.m:17)
8 libdyld.dylib 0x0000000196f82a04 start + 0
Thread 1 name: Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0 libsystem_kernel.dylib 0x0000000197080c24 kevent64 + 8
1 libdispatch.dylib 0x0000000196f65e6c _dispatch_mgr_invoke + 272
2 libdispatch.dylib 0x0000000196f57998 _dispatch_mgr_thread + 48
Thread 2 name: com.apple.coremedia.player.async
Thread 2:
0 libsystem_kernel.dylib 0x0000000197080e48 semaphore_wait_trap + 8
1 libdispatch.dylib 0x0000000196f63f3c _dispatch_semaphore_wait_slow + 252
2 MediaToolbox 0x000000018780cb48 fpa_AsyncMovieControlThread + 1952
3 CoreMedia 0x0000000185b5f9ac figThreadMain + 244
4 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
5 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
6 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 3 name: com.apple.NSURLConnectionLoader
Thread 3:
0 libsystem_kernel.dylib 0x0000000197080e0c mach_msg_trap + 8
1 libsystem_kernel.dylib 0x0000000197080c84 mach_msg + 68
2 CoreFoundation 0x00000001852fb720 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x00000001852f9674 __CFRunLoopRun + 936
4 CoreFoundation 0x00000001852252d0 CFRunLoopRunSpecific + 392
5 CFNetwork 0x0000000184d06890 +[NSURLConnection(Loader) _resourceLoadLoop:] + 436
6 Foundation 0x0000000186245db4 __NSThread__main__ + 1068
7 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
8 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
9 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 4 name: WebThread
Thread 4 Crashed:
0 JavaScriptCore 0x0000000186c3d58c WTFCrash + 72
1 JavaScriptCore 0x0000000186c3d580 WTFCrash + 60
2 JavaScriptCore 0x0000000186b3df1c JSC::JSLock::DropAllLocks::DropAllLocks(JSC::VM*) + 268
3 WebCore 0x000000019391fd54 SendDelegateMessage(NSInvocation*) + 128
4 CoreFoundation 0x0000000185347f68 ___forwarding___ + 436
5 CoreFoundation 0x000000018524acc8 _CF_forwarding_prep_0 + 88
6 WebCore 0x000000019395fda0 WebCore::DOMWindow::removeAllEventListeners() + 176
7 WebCore 0x0000000193943694 WebCore::Document::removeAllEventListeners() + 28
8 WebCore 0x00000001939424b8 WebCore::Document::~Document() + 216
9 WebCore 0x0000000193d9a12c WebCore::HTMLDocument::~HTMLDocument() + 8
10 WebCore 0x0000000193942114 WebCore::Node::~Node() + 152
11 WebCore 0x0000000193941f0c WebCore::HTMLHtmlElement::~HTMLHtmlElement() + 8
12 WebCore 0x00000001939b7874 WebCore::JSNodeOwner::finalize(JSC::Handle<JSC::Unknown>, void*) + 420
13 JavaScriptCore 0x0000000186895498 JSC::WeakBlock::sweep() + 108
14 JavaScriptCore 0x000000018681c978 JSC::WeakSet::sweep() + 28
15 JavaScriptCore 0x000000018681c8fc JSC::MarkedBlock::sweep(JSC::MarkedBlock::SweepMode) + 24
16 JavaScriptCore 0x000000018681b58c JSC::MarkedAllocator::allocateSlowCase(unsigned long) + 296
17 WebCore 0x0000000194010c1c WebCore::JSDOMWrapper* WebCore::createWrapper<WebCore::JSHTMLCanvasElement, WebCore::HTMLCanvasElement>(WebCore::JSDOMGlobalObject*, WebCore::HTMLCanvasElement*) + 588
18 WebCore 0x0000000194007a3c WebCore::createJSHTMLWrapper(WebCore::JSDOMGlobalObject*, WTF::PassRefPtr<WebCore::HTMLElement>) + 312
19 WebCore 0x0000000193887348 WebCore::toJSNewlyCreated(JSC::ExecState*, WebCore::JSDOMGlobalObject*, WebCore::Element*) + 56
20 WebCore 0x00000001938871a4 WebCore::jsDocumentPrototypeFunctionCreateElement(JSC::ExecState*) + 376
21 JavaScriptCore 0x0000000186b96fac llint_entry + 26156
22 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
23 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
24 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
25 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
26 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
27 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
28 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
29 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
30 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
31 JavaScriptCore 0x0000000186b969d8 llint_entry + 24664
32 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
33 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
34 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
35 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
36 JavaScriptCore 0x0000000186b96974 llint_entry + 24564
37 JavaScriptCore 0x0000000186b90760 callToJavaScript + 304
38 JavaScriptCore 0x0000000186afeac4 JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) + 44
39 JavaScriptCore 0x00000001868695e0 JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 416
40 JavaScriptCore 0x0000000186940924 JSC::boundFunctionCall(JSC::ExecState*) + 532
41 JavaScriptCore 0x0000000186b908e8 callToNativeFunction + 312
42 JavaScriptCore 0x0000000186869624 JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 484
43 JavaScriptCore 0x0000000186995738 JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&, JSC::JSValue*) + 88
44 WebCore 0x0000000193a932a4 WebCore::JSCallbackData::invokeCallback(JSC::JSValue, JSC::MarkedArgumentBuffer&, bool*) + 580
45 WebCore 0x00000001940dd988 WebCore::JSRequestAnimationFrameCallback::handleEvent(double) + 176
46 WebCore 0x0000000194423de4 WebCore::ScriptedAnimationController::serviceScriptedAnimations(double) + 424
47 WebCore 0x0000000193c2462c WebCore::DisplayRefreshMonitor::displayDidRefresh() + 452
48 QuartzCore 0x000000018971a298 CA::Display::DisplayLinkItem::dispatch() + 28
49 QuartzCore 0x000000018971a130 CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 320
50 IOKit 0x00000001864f546c IODispatchCalloutFromCFMessage + 372
51 CoreFoundation 0x00000001852e6dc0 __CFMachPortPerform + 176
52 CoreFoundation 0x00000001852fba50 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
53 CoreFoundation 0x00000001852fb9b0 __CFRunLoopDoSource1 + 432
54 CoreFoundation 0x00000001852f9930 __CFRunLoopRun + 1636
55 CoreFoundation 0x00000001852252d0 CFRunLoopRunSpecific + 392
56 WebCore 0x0000000193904890 RunWebThread(void*) + 464
57 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
58 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
59 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 5 name: com.apple.CFSocket.private
Thread 5:
0 libsystem_kernel.dylib 0x000000019709b498 __select + 8
1 CoreFoundation 0x0000000185301124 __CFSocketManager + 668
2 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
3 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
4 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 6 name: JavaScriptCore::BlockFree
Thread 6:
0 libsystem_kernel.dylib 0x000000019709b078 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x0000000197136f28 _pthread_cond_wait + 620
2 libc++.1.dylib 0x0000000196080d5c std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 136
3 JavaScriptCore 0x0000000186982574 JSC::BlockAllocator::waitForDuration(std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l> >) + 176
4 JavaScriptCore 0x0000000186819588 JSC::BlockAllocator::blockFreeingThreadMain() + 76
5 JavaScriptCore 0x0000000186814b9c WTF::wtfThreadEntryPoint(void*) + 20
6 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
7 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
8 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 7 name: JavaScriptCore::Marking
Thread 7:
0 libsystem_kernel.dylib 0x000000019709b078 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x0000000197136f28 _pthread_cond_wait + 620
2 libc++.1.dylib 0x0000000196080cac std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 52
3 JavaScriptCore 0x0000000186ac2edc JSC::GCThread::waitForNextPhase() + 152
4 JavaScriptCore 0x0000000186ac2f80 JSC::GCThread::gcThreadMain() + 88
5 JavaScriptCore 0x0000000186814b9c WTF::wtfThreadEntryPoint(void*) + 20
6 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
7 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
8 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 8 name: JavaScriptCore::Marking
Thread 8:
0 libsystem_kernel.dylib 0x000000019709b078 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x0000000197136f28 _pthread_cond_wait + 620
2 libc++.1.dylib 0x0000000196080cac std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 52
3 JavaScriptCore 0x0000000186ac2edc JSC::GCThread::waitForNextPhase() + 152
4 JavaScriptCore 0x0000000186ac2f80 JSC::GCThread::gcThreadMain() + 88
5 JavaScriptCore 0x0000000186814b9c WTF::wtfThreadEntryPoint(void*) + 20
6 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
7 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
8 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 9 name: WebCore: CFNetwork Loader
Thread 9:
0 libsystem_kernel.dylib 0x0000000197080e0c mach_msg_trap + 8
1 libsystem_kernel.dylib 0x0000000197080c84 mach_msg + 68
2 CoreFoundation 0x00000001852fb720 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x00000001852f9674 __CFRunLoopRun + 936
4 CoreFoundation 0x00000001852252d0 CFRunLoopRunSpecific + 392
5 WebCore 0x00000001939389ac WebCore::runLoaderThread(void*) + 284
6 JavaScriptCore 0x0000000186814b9c WTF::wtfThreadEntryPoint(void*) + 20
7 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
8 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
9 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 10 name: WebCore: LocalStorage
Thread 10:
0 libsystem_kernel.dylib 0x000000019709b078 __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x0000000197136f28 _pthread_cond_wait + 620
2 JavaScriptCore 0x00000001868197bc WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 76
3 WebCore 0x000000019448e32c std::__1::unique_ptr<WTF::Function<void ()>, std::__1::default_delete<WTF::Function<void ()> > > WTF::MessageQueue<WTF::Function<void ()> >::waitForMessageFilteredWithTimeout<WTF::MessageQueue<WTF::Function<void ()> >::waitForMessage()::'lambda'(WTF::Function<void ()> const&)>(WTF::MessageQueueWaitResult&, WTF::MessageQueue<WTF::Function<void ()> >::waitForMessage()::'lambda'(WTF::Function<void ()> const&)&&, double) + 96
4 WebCore 0x0000000193a00ff8 WebCore::StorageThread::threadEntryPoint() + 220
5 JavaScriptCore 0x0000000186814b9c WTF::wtfThreadEntryPoint(void*) + 20
6 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
7 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
8 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 11 name: AVAudioSession Notify Thread
Thread 11:
0 libsystem_kernel.dylib 0x0000000197080e0c mach_msg_trap + 8
1 libsystem_kernel.dylib 0x0000000197080c84 mach_msg + 68
2 CoreFoundation 0x00000001852fb720 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x00000001852f9674 __CFRunLoopRun + 936
4 CoreFoundation 0x00000001852252d0 CFRunLoopRunSpecific + 392
5 libAVFAudio.dylib 0x0000000183ca102c GenericRunLoopThread::Entry(void*) + 160
6 libAVFAudio.dylib 0x0000000183c93a0c CAPThread::Entry(CAPThread*) + 116
7 libsystem_pthread.dylib 0x0000000197137dc4 _pthread_body + 160
8 libsystem_pthread.dylib 0x0000000197137d20 _pthread_start + 156
9 libsystem_pthread.dylib 0x0000000197134ef4 thread_start + 0
Thread 12:
0 libsystem_kernel.dylib 0x000000019709bc78 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001971352d8 _pthread_wqthread + 988
2 libsystem_pthread.dylib 0x0000000197134eec start_wqthread + 0
Thread 13:
0 libsystem_kernel.dylib 0x000000019709bc78 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001971352d8 _pthread_wqthread + 988
2 libsystem_pthread.dylib 0x0000000197134eec start_wqthread + 0
Thread 14:
0 libsystem_kernel.dylib 0x000000019709bc78 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001971352d8 _pthread_wqthread + 988
2 libsystem_pthread.dylib 0x0000000197134eec start_wqthread + 0
Thread 15:
0 libsystem_kernel.dylib 0x000000019709bc78 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001971352d8 _pthread_wqthread + 988
2 libsystem_pthread.dylib 0x0000000197134eec start_wqthread + 0
Thread 16:
0 libsystem_kernel.dylib 0x000000019709bc78 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001971352d8 _pthread_wqthread + 988
2 libsystem_pthread.dylib 0x0000000197134eec start_wqthread + 0
Thread 17:
0 libsystem_kernel.dylib 0x000000019709bc78 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001971352d8 _pthread_wqthread + 988
2 libsystem_pthread.dylib 0x0000000197134eec start_wqthread + 0
Thread 18:
0 libsystem_kernel.dylib 0x000000019709bc78 __workq_kernreturn + 8
1 libsystem_pthread.dylib 0x00000001971352d8 _pthread_wqthread + 988
2 libsystem_pthread.dylib 0x0000000197134eec start_wqthread + 0
Thread 4 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x00001f0000001f00 x2: 0x000000019aeb1ee0 x3: 0x0000000103b2c82c
x4: 0x0000000103b2c828 x5: 0x0000000103b2c900 x6: 0x000000000000000a x7: 0x0000000000000fa0
x8: 0x00000000bbadbeef x9: 0x0000000000000000 x10: 0x0000000000001f00 x11: 0x0000000000001f00
x12: 0x0000000186b96978 x13: 0x0000000000000000 x14: 0x0000000000000003 x15: 0x0000000000000000
x16: 0x00000001970c80fc x17: 0x0000000000000000 x18: 0x0000000000000000 x19: 0x0000000103b2c9a8
x20: 0x0000000170a786c0 x21: 0x0000000170a786c0 x22: 0x000000018a59aedd x23: 0x000000019a8ebb20
x24: 0x000000019a8eba10 x25: 0x000000018a58a2d0 x26: 0x0000000103b2cfa0 x27: 0x000000000000a740
x28: 0x0000000000000002 fp: 0x0000000103b2cac0 lr: 0x0000000186c3d584
sp: 0x0000000103b2c9a0 pc: 0x0000000186c3d58c cpsr: 0x60000000
This crash is a result of bug in WebKit. It was fixed at 06/05/15. iOS 9 was released at 09/09/15, so most probably this bug is already fixed in last iOS version. Although it still affects iOS 8, and there is no straightforward workaround.
来源：https://stackoverflow.com/questions/30315696/webthread-javascriptcore-crash-what-this-crash-report-means