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Hi everyone,This crash appeared with our latest app version and with iOS 11.1 beta only. Our best guess is that, it's somehow related to app swither. Investigating and trying to reproduce it right now. Ideas/suggestions are welcome 🙂Crash: libsystem_kernel.dylib: mach_msg_trap + 8OS version: iPhone OS 11.1 (15B5078e)Incident Identifier: RANDOM_ID CrashReporter Key: 268984cb5bd1b31b8d58ecf6b345b4d612a308ca Hardware Model: iPhone9,2 Process: COMPANY_NAME [2020] Path: /private/var/containers/Bundle/Application/RANDOM_ID/COMPANY_NAME.app/COMPANY_NAME Identifier: net.COMPANY_NAME.iphone Version: BUILDID (APP.VERSION) Code Type: ARM-64 (Native) Role: Foreground Parent Process: launchd [1] Coalition: net.COMPANY_NAME.iphone [987] Date/Time: 2017-10-12 15:05:14.7610 +0900 Launch Time: 2017-10-12 14:53:40.6104 +0900 OS Version: iPhone OS 11.1 (15B5078e) Baseband Version: 3.20.00 Report Version: 104 Exception Type: EXC_CRASH (SIGKILL) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Termination Reason: Namespace SPRINGBOARD, Code 0xdeadfa11 Termination Description: SPRINGBOARD, killed from app switcher | | ProcessVisibility: Background | ProcessState: Suspended Triggered by Thread: 0 Thread 0 name: Thread 0 Crashed: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 CoreFoundation 0x0000000184049c74 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613) 3 CoreFoundation 0x0000000184047840 __CFRunLoopRun + 1424 (CFRunLoop.c:2969) 4 CoreFoundation 0x0000000183f67fb8 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245) 5 GraphicsServices 0x0000000185dfdf84 GSEventRunModal + 100 (GSEvent.c:2245) 6 UIKit 0x000000018d53a598 UIApplicationMain + 208 (UIApplication.m:3949) 7 COMPANY_NAME 0x0000000105031fbc main + 104 (main.m:23) 8 libdyld.dylib 0x0000000183a8a56c start + 4 Thread 1 name: Thread 1: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 CoreFoundation 0x0000000184049c74 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613) 3 CoreFoundation 0x0000000184047840 __CFRunLoopRun + 1424 (CFRunLoop.c:2969) 4 CoreFoundation 0x0000000183f67fb8 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245) 5 Foundation 0x00000001849916e4 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304 (NSRunLoop.m:367) 6 Foundation 0x00000001849b0afc -[NSRunLoop(NSRunLoop) runUntilDate:] + 96 (NSRunLoop.m:411) 7 UIKit 0x000000018e099384 -[UIEventFetcher threadMain] + 136 (UIEventFetcher.m:436) 8 Foundation 0x0000000184a92860 __NSThread__start__ + 996 (NSThread.m:1181) 9 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 10 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 11 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 2 name: Thread 2: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 COMPANY_NAME 0x0000000105c8fd68 CLSMachExceptionServer + 100 3 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 4 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 5 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 3 name: Thread 3: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 CoreFoundation 0x0000000184049c74 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613) 3 CoreFoundation 0x0000000184047840 __CFRunLoopRun + 1424 (CFRunLoop.c:2969) 4 CoreFoundation 0x0000000183f67fb8 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245) 5 CFNetwork 0x00000001846d2488 +[NSURLConnection(Loader) _resourceLoadLoop:] + 404 (NSURLConnection.mm:367) 6 Foundation 0x0000000184a92860 __NSThread__start__ + 996 (NSThread.m:1181) 7 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 8 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 9 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 4: 0 libsystem_kernel.dylib 0x0000000183bb9150 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x0000000183cced30 _pthread_cond_wait$VARIANT$mp + 640 (pthread_cond.c:579) 2 libc++.1.dylib 0x0000000183273ea4 std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 24 (__threading_support:278) 3 JavaScriptCore 0x000000018b315d00 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >(std::__1::unique_lock<bmalloc::Mutex>&) + 96 (condition_variable:202) 4 JavaScriptCore 0x000000018b315c28 bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>::threadRunLoop() + 172 (condition_variable:211) 5 JavaScriptCore 0x000000018b315f8c void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>*), bmalloc::AsyncTask<bmalloc::Heap, void (bmalloc::Heap::*)()>*> >(void*) + 44 (type_traits:4291) 6 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 7 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 8 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 5 name: Thread 5: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 CoreFoundation 0x0000000184049c74 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613) 3 CoreFoundation 0x0000000184047840 __CFRunLoopRun + 1424 (CFRunLoop.c:2969) 4 CoreFoundation 0x0000000183f67fb8 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245) 5 WebCore 0x000000018bdda264 RunWebThread(void*) + 456 (WebCoreThread.mm:694) 6 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 7 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 8 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 6 name: Thread 6: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 CoreFoundation 0x0000000184049c74 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613) 3 CoreFoundation 0x0000000184047840 __CFRunLoopRun + 1424 (CFRunLoop.c:2969) 4 CoreFoundation 0x0000000183f67fb8 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245) 5 Foundation 0x00000001849916e4 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304 (NSRunLoop.m:367) 6 Foundation 0x00000001849e362c -[NSRunLoop(NSRunLoop) run] + 88 (NSRunLoop.m:389) 7 COMPANY_NAME 0x000000010534cfd4 +[GAI threadMain:] + 64 8 Foundation 0x0000000184a92860 __NSThread__start__ + 996 (NSThread.m:1181) 9 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 10 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 11 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 7 name: Thread 7: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 CoreFoundation 0x0000000184049c74 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613) 3 CoreFoundation 0x0000000184047840 __CFRunLoopRun + 1424 (CFRunLoop.c:2969) 4 CoreFoundation 0x0000000183f67fb8 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245) 5 CoreFoundation 0x0000000183fb7098 CFRunLoopRun + 116 (CFRunLoop.c:3269) 6 CoreMotion 0x0000000189363298 CLMotionCore::runMotionThread(void*) + 952 (CLMotionCore.mm:316) 7 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 8 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 9 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 8 name: Thread 8: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 CoreFoundation 0x0000000184049c74 __CFRunLoopServiceMachPort + 196 (CFRunLoop.c:2613) 3 CoreFoundation 0x0000000184047840 __CFRunLoopRun + 1424 (CFRunLoop.c:2969) 4 CoreFoundation 0x0000000183f67fb8 CFRunLoopRunSpecific + 436 (CFRunLoop.c:3245) 5 AVFAudio 0x0000000189851774 GenericRunLoopThread::Entry(void*) + 164 (GenericRunLoopThread.h:92) 6 AVFAudio 0x000000018987c018 CAPThread::Entry(CAPThread*) + 84 7 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 8 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 9 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 9 name: Thread 9: 0 libsystem_kernel.dylib 0x0000000183bb9150 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x0000000183cced30 _pthread_cond_wait$VARIANT$mp + 640 (pthread_cond.c:579) 2 JavaScriptCore 0x000000018a9dda18 ***::ThreadCondition::timedWait(***::Mutex&, double) + 80 (ThreadingPthreads.cpp:521) 3 JavaScriptCore 0x000000018b2fba04 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda<bool ()> const&, ***::ScopedLambda<void ()> const&, ***::TimeWithDynamicClockType const&) + 2208 (ParkingLot.cpp:597) 4 WebKitLegacy 0x000000018d1ce528 bool ***::ConditionBase::waitUntil<***::Lock>(***::Lock&, ***::TimeWithDynamicClockType const&) + 172 (ParkingLot.h:80) 5 WebKitLegacy 0x000000018d1d1198 std::__1::unique_ptr<***::Function<void ()>, std::__1::default_delete<***::Function<void ()> > > ***::MessageQueue<***::Function<void ()> >::waitForMessageFilteredWithTimeout<***::MessageQueue<***::Function<void ()> >::waitForMessage()::'lambda'(***::Function<void ()> const&)>(***::MessageQueueWaitResult&, ***::MessageQueue<***::Function<void ()> >::waitForMessage()::'lambda'(***::Function<void ()> const&)&&, ***::WallTime) + 148 (MessageQueue.h:153) 6 WebKitLegacy 0x000000018d1d08c4 WebCore::StorageThread::threadEntryPoint() + 68 (MessageQueue.h:132) 7 JavaScriptCore 0x000000018a9da010 ***::threadEntryPoint(void*) + 120 (Function.h:56) 8 JavaScriptCore 0x000000018a9d9f50 ***::wtfThreadEntryPoint(void*) + 84 (ThreadingPthreads.cpp:209) 9 libsystem_pthread.dylib 0x0000000183ccc31c _pthread_body + 308 (pthread.c:740) 10 libsystem_pthread.dylib 0x0000000183ccc1e8 _pthread_start + 312 (pthread.c:799) 11 libsystem_pthread.dylib 0x0000000183ccac28 thread_start + 4 Thread 10: 0 libsystem_pthread.dylib 0x0000000183ccac1c start_wqthread + 0 Thread 11 name: Thread 11: 0 libsystem_kernel.dylib 0x0000000183b98bc4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000183b98a3c mach_msg + 72 (mach_msg.c:103) 2 libdispatch.dylib 0x0000000183a3e4cc _dispatch_mach_msg_send + 752 (mach.c:1137) 3 libdispatch.dylib 0x0000000183a3db1c _dispatch_mach_send_drain + 480 (mach.c:1338) 4 libdispatch.dylib 0x0000000183a3a8ac _dispatch_mach_send_msg + 456 (mach.c:1831) 5 libdispatch.dylib 0x0000000183a3b290 dispatch_mach_send_with_result_and_async_reply_4libxpc$VARIANT$mp + 116 (mach.c:1993) 6 libxpc.dylib 0x0000000183d03ae8 _xpc_connection_enqueue + 124 (connection.c:764) 7 libxpc.dylib 0x0000000183d04c20 xpc_connection_send_message_with_reply + 236 (connection.c:3275) 8 BaseBoard 0x0000000186576298 -[BSXPCMessage sendToConnection:replyQueue:replyHandler:] + 160 (BSXPCMessage.m:168) 9 BaseBoard 0x000000018657616c -[BSXPCMessage sendToConnection:] + 88 (BSXPCMessage.m:155) 10 BaseBoard 0x0000000186572eb0 __75-[BSBaseXPCClient _sendMessage:withReplyHandler:waitForReply:waitDuration:]_block_invoke.77 + 192 (BSBaseXPCClient.m:198) 11 libdispatch.dylib 0x0000000183a25088 _dispatch_call_block_and_release + 24 (init.c:994) 12 libdispatch.dylib 0x0000000183a25048 _dispatch_client_callout + 16 (object.m:502) 13 libdispatch.dylib 0x0000000183a2ee48 _dispatch_queue_serial_drain$VARIANT$mp + 528 (inline_internal.h:2500) 14 libdispatch.dylib 0x0000000183a2f7d8 _dispatch_queue_invoke$VARIANT$mp + 340 (queue.c:5302) 15 libdispatch.dylib 0x0000000183a30200 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 400 (queue.c:5920) 16 libdispatch.dylib 0x0000000183a384a0 _dispatch_workloop_worker_thread$VARIANT$mp + 644 (source.c:2515) 17 libsystem_pthread.dylib 0x0000000183ccafd0 _pthread_wqthread + 932 (pthread.c:2207) 18 libsystem_pthread.dylib 0x0000000183ccac20 start_wqthread + 4 Thread 0 crashed with ARM Thread State (64-bit): x0: 0x0000000000000000 x1: 0x0000000007000806 x2: 0x0000000000000000 x3: 0x0000000000000c00 x4: 0x0000000000002103 x5: 0x00000000ffffffff x6: 0x0000000000000000 x7: 0x0000000000000403 x8: 0x00000000fffffbbf x9: 0x0000000007000000 x10: 0x0000000007000100 x11: 0x0000000000000040 x12: 0xffffffffffffffff x13: 0x0000000000000001 x14: 0x01047c0001047c00 x15: 0x0000000000000000 x16: 0xffffffffffffffe1 x17: 0x00000000ffffffff x18: 0x0000000000000000 x19: 0x0000000000000000 x20: 0x00000000ffffffff x21: 0x0000000000002103 x22: 0x0000000000000c00 x23: 0x000000016aed6d38 x24: 0x0000000007000806 x25: 0x0000000000000000 x26: 0x0000000007000806 x27: 0x0000000000000c00 x28: 0x0000000000000001 fp: 0x000000016aed6c30 lr: 0x0000000183b98a3c sp: 0x000000016aed6be0 pc: 0x0000000183b98bc4 cpsr: 0x60000000