I'm getting the following crash reports on iOS version 15.2 through 15.6 on iPhone/iPad. I actually can't reproduce the crash but have plenty of reports crashing WebCoreResourceHandleAsOperationQueueDelegate.mm:341. The app loads multiple hidden web views simultaneously and then shows a successfully loaded view. Exceptions are in the following form: Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000048 Exception Codes: 0x0000000000000001, 0x0000000000000048 VM Region Info: 0x48 is not in any region. Bytes before following region: 4305256376 REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL UNUSED SPACE AT START ---> __TEXT 1009d0000-100b2c000 [ 1392K] r-x/r-x SM=COW Exception Note: EXC_CORPSE_NOTIFY Termination Reason: SIGNAL 11 Segmentation fault: 11 Terminating Process: exc handler [26525] Thread 6 Crashed: 0 WebCore 0x00000001a130fa90 WTF::Detail::CallableWrapper<-[WebCoreResourceHandleAsOperationQueueDelegate connectionDidFinishLoading:]::$_7, void>::call() + 192 (WebCoreResourceHandleAsOperationQueueDelegate.mm:341) 1 WebCore 0x00000001a130fa38 WTF::Detail::CallableWrapper<-[WebCoreResourceHandleAsOperationQueueDelegate connectionDidFinishLoading:]::$_7, void>::call() + 104 (WebCoreResourceHandleAsOperationQueueDelegate.mm:338) 2 JavaScriptCore 0x000000019aaea2d0 WTF::RunLoop::performWork() + 200 (Function.h:82) 3 JavaScriptCore 0x000000019aaeb06c WTF::RunLoop::performWork(void*) + 36 (RunLoopCF.cpp:46) 4 CoreFoundation 0x000000018f8f3414 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1972) 5 CoreFoundation 0x000000018f9041a0 __CFRunLoopDoSource0 + 208 (CFRunLoop.c:2016) 6 CoreFoundation 0x000000018f83d694 __CFRunLoopDoSources0 + 268 (CFRunLoop.c:2053) 7 CoreFoundation 0x000000018f84305c __CFRunLoopRun + 828 (CFRunLoop.c:2951) 8 CoreFoundation 0x000000018f856bc8 CFRunLoopRunSpecific + 600 (CFRunLoop.c:3268) 9 WebCore 0x000000019fc48d9c RunWebThread(void*) + 760 (WebCoreThread.mm:679) 10 libsystem_pthread.dylib 0x00000002012399ac _pthread_start + 148 (pthread.c:891) 11 libsystem_pthread.dylib 0x0000000201238e68 thread_start + 8 (:-1) 0x1a828f000 - 0x1aa7f8fff WebCore arm64e <46356aa10f253215915edbc81e3b4699> /System/Library/PrivateFrameworks/WebCore.framework/WebCore 0x1a3ccb000 - 0x1a514ffff JavaScriptCore arm64e <e76b377fc862395a9439d12b09a59e07> /System/Library/Frameworks/JavaScriptCore.framework/JavaScriptCore
I'm not sure if what I mentioned about "loads multiple hidden web views simultaneously" is accurate or really relevant.
CC'ing Alex, who may have an idea about this. That said, this is using deprecated legacy WebKit API. We recommend switching to the modern WebKit API.
<rdar://problem/99622179>