iOS 11 CFNework Crash - TCPIOConnection::_handleTLSEvent(nw_tls_context*, tls_handshake_message_t, void () block_pointer, bool)

Question

Area: CFNetwork FrameworkSummary:Crashlytics is reporting frequent crashes every hour from `CFNetwork`. We have no idea what's causing it. The app is always in 'Foreground' when this happens, so we are sure that it's nothing to do with background activity, but we not yet sure.This happens after iOS 11 has been released and with iOS 11.2.6 app crashing scenario getting higher then usual.Any idea what's changed in iOS 11 that's causing the app to crash so often?Steps to Reproduce: We only found these crashes from our live app store release in Crashlytics. I Cant reproduced at my end.Following is the stacktrace we found from Crashlytics!!!# Platform: ios# Issue #: 2# Date: 2018-04-05T05:03:00Z# OS Version: 11.2.6 (15D100)# Device: iPhone 6# RAM Free: 3%# Disk Free: 14.1%#1. Crashed: com.apple.CFNetwork.Connection0  libsystem_kernel.dylib         0x1838782e8 __pthread_kill + 81  libsystem_pthread.dylib        0x18398d2f8 pthread_kill$VARIANT$mp + 3962  libsystem_c.dylib              0x1837e6fbc abort + 1403  libsystem_c.dylib              0x1837baaa0 basename_r + 3144  CFNetwork                      0x184476d6c TCPIOConnection::_handleTLSEvent(nw_tls_context*, tls_handshake_message_t, void () block_pointer, bool) + 7725  libnetwork.dylib               0x184c63d7c __tcp_connection_set_tls_message_handler_on_nw_connection_block_invoke + 1686  libboringssl.dylib             0x184b3934c ___boringssl_context_certificate_request_callback_block_invoke + 1367  libdispatch.dylib              0x1836e2a54 _dispatch_call_block_and_release + 248  libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 169  libdispatch.dylib              0x1836ec96c _dispatch_queue_serial_drain$VARIANT$mp + 52810 libdispatch.dylib              0x1836ed2fc _dispatch_queue_invoke$VARIANT$mp + 34011 libdispatch.dylib              0x1836ec824 _dispatch_queue_serial_drain$VARIANT$mp + 20012 libdispatch.dylib              0x1836ed2fc _dispatch_queue_invoke$VARIANT$mp + 34013 libdispatch.dylib              0x1836edd20 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 40414 libdispatch.dylib              0x1836f603c _dispatch_workloop_worker_thread$VARIANT$mp + 64415 libsystem_pthread.dylib        0x18398af1c _pthread_wqthread + 93216 libsystem_pthread.dylib        0x18398ab6c start_wqthread + 4--#0. com.apple.main-thread0  (Missing)                      0x100d5f608 (Missing)1  (Missing)                      0x100d5f680 (Missing)2  (Missing)                      0x100d5b2e0 (Missing)3  (Missing)                      0x100d5b204 (Missing)4  (Missing)                      0x100d5aae0 (Missing)5  (Missing)                      0x100d66490 (Missing)6  (Missing)                      0x100d66700 (Missing)7  (Missing)                      0x100d67c5c (Missing)8  (Missing)                      0x100d50500 (Missing)9  libdyld.dylib                  0x1837487a8 dyld_stub_binder + 6010 AppName                      0x10090a83c CLSExceptionCheckHandlers (CLSException.mm:336)11 AppName                      0x100900690 __60-[CLSCrashReportingController crashReportingSetupCompleted:]_block_invoke (CLSCrashReportingController.m:208)12 libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1613 libdispatch.dylib              0x1836eaf08 _dispatch_continuation_pop$VARIANT$mp + 42814 libdispatch.dylib              0x1836f4848 _dispatch_source_invoke$VARIANT$mp + 158815 libdispatch.dylib              0x1836ef570 _dispatch_main_queue_callback_4CF$VARIANT$mp + 72016 CoreFoundation                 0x183d0b344 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 1217 CoreFoundation                 0x183d08f20 __CFRunLoopRun + 201218 CoreFoundation                 0x183c28c58 CFRunLoopRunSpecific + 43619 GraphicsServices               0x185ad4f84 GSEventRunModal + 10020 UIKit                          0x18d3815c4 UIApplicationMain + 23621 AppName                      0x10073ac2c main (main.m:12)22 libdyld.dylib                  0x18374856c start + 4#1. Crashed: com.apple.CFNetwork.Connection0  libsystem_kernel.dylib         0x1838782e8 __pthread_kill + 81  libsystem_pthread.dylib        0x18398d2f8 pthread_kill$VARIANT$mp + 3962  libsystem_c.dylib              0x1837e6fbc abort + 1403  libsystem_c.dylib              0x1837baaa0 basename_r + 3144  CFNetwork                      0x184476d6c TCPIOConnection::_handleTLSEvent(nw_tls_context*, tls_handshake_message_t, void () block_pointer, bool) + 7725  libnetwork.dylib               0x184c63d7c __tcp_connection_set_tls_message_handler_on_nw_connection_block_invoke + 1686  libboringssl.dylib             0x184b3934c ___boringssl_context_certificate_request_callback_block_invoke + 1367  libdispatch.dylib              0x1836e2a54 _dispatch_call_block_and_release + 248  libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 169  libdispatch.dylib              0x1836ec96c _dispatch_queue_serial_drain$VARIANT$mp + 52810 libdispatch.dylib              0x1836ed2fc _dispatch_queue_invoke$VARIANT$mp + 34011 libdispatch.dylib              0x1836ec824 _dispatch_queue_serial_drain$VARIANT$mp + 20012 libdispatch.dylib              0x1836ed2fc _dispatch_queue_invoke$VARIANT$mp + 34013 libdispatch.dylib              0x1836edd20 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 40414 libdispatch.dylib              0x1836f603c _dispatch_workloop_worker_thread$VARIANT$mp + 64415 libsystem_pthread.dylib        0x18398af1c _pthread_wqthread + 93216 libsystem_pthread.dylib        0x18398ab6c start_wqthread + 4#2. com.google.fira.worker0  AppName                      0x10094a440 -[FIRASqliteStore sqliteHandle] + 43168328321  AppName                      0x10094d288 -[FIRASqliteStore recordsForQuery:parameterValues:error:] + 43168446802  AppName                      0x1009612f8 -[FIRADatabase dataTypesFromTableWithName:columnName:columnValue:error:createDataTypeBlock:] + 43169267123  AppName                      0x100956a54 -[FIRADatabase queryAppMetadata:] + 43168835404  AppName                      0x10095667c __37-[FIRADatabase initializeAppMetadata]_block_invoke + 43168825565  AppName                      0x10094d958 -[FIRASqliteStore performTransaction:] + 43168464246  AppName                      0x100956628 -[FIRADatabase initializeAppMetadata] + 43168824727  AppName                      0x1009563c8 -[FIRADatabase initWithDatabaseName:persistedConfig:] + 43168818648  AppName                      0x100965154 __48-[FIRAMeasurement startMeasurementOnWorkerQueue]_block_invoke + 43169426769  libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1610 libdispatch.dylib              0x1836e6240 dispatch_once_f$VARIANT$mp + 6011 AppName                      0x100964e74 -[FIRAMeasurement startMeasurementOnWorkerQueue] + 431694194012 AppName                      0x100964c44 -[FIRAMeasurement setEnabledOnWorkerQueue:] + 431694138013 AppName                      0x1009793a4 __52-[FIRAScheduler scheduleOnWorkerQueueBlockID:block:]_block_invoke + 431702518814 libdispatch.dylib              0x1836e2a54 _dispatch_call_block_and_release + 2415 libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1616 libdispatch.dylib              0x1836ec96c _dispatch_queue_serial_drain$VARIANT$mp + 52817 libdispatch.dylib              0x1836ed2fc _dispatch_queue_invoke$VARIANT$mp + 34018 libdispatch.dylib              0x1836edd20 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 40419 libdispatch.dylib              0x1836f603c _dispatch_workloop_worker_thread$VARIANT$mp + 64420 libsystem_pthread.dylib        0x18398af1c _pthread_wqthread + 93221 libsystem_pthread.dylib        0x18398ab6c start_wqthread + 4#3. com.apple.uikit.eventfetch-thread0  libsystem_kernel.dylib         0x183857568 mach_msg_trap + 81  libsystem_kernel.dylib         0x1838573e0 mach_msg + 722  CoreFoundation                 0x183d0b108 __CFRunLoopServiceMachPort + 1963  CoreFoundation                 0x183d08cd4 __CFRunLoopRun + 14244  CoreFoundation                 0x183c28c58 CFRunLoopRunSpecific + 4365  Foundation                     0x18465d594 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 3046  Foundation                     0x18467c9ac -[NSRunLoop(NSRunLoop) runUntilDate:] + 967  UIKit                          0x18deeb7a8 -[UIEventFetcher threadMain] + 1368  Foundation                     0x18475f0f4 __NSThread__start__ + 9969  libsystem_pthread.dylib        0x18398c2b4 _pthread_body + 30810 libsystem_pthread.dylib        0x18398c180 _pthread_body + 31011 libsystem_pthread.dylib        0x18398ab74 thread_start + 4#4. Thread0  libsystem_kernel.dylib         0x183878d80 __workq_kernreturn + 81  libsystem_pthread.dylib        0x18398b080 _pthread_wqthread + 12882  libsystem_pthread.dylib        0x18398ab6c start_wqthread + 4#5. io.answers.EventQueue (QOS: BACKGROUND)0  CFNetwork                      0x184543000 -[__NSCFURLSessionConfiguration copyWithZone:] + 31561  CFNetwork                      0x18454151c +[NSURLSessionConfiguration defaultSessionConfiguration] + 442  AppName                      0x100937b48 +[CLSURLSessionConfiguration defaultSessionConfiguration] (CLSURLSessionConfiguration.m:24)3  AppName                      0x10091f4ac -[ANSUploader session] (ANSUploader.m:189)4  AppName                      0x10092027c __71-[ANSUploader checkForExistingTaskMatchingDescription:completionBlock:]_block_invoke (ANSUploader.m:304)5  Foundation                     0x184739ba0 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 166  Foundation                     0x184679894 -[NSBlockOperation main] + 727  Foundation                     0x1846694c4 -[__NSOperationInternal _start:] + 8488  libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 169  libdispatch.dylib              0x1836ea200 _dispatch_block_invoke_direct$VARIANT$mp + 28810 libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1611 libdispatch.dylib              0x1836ea200 _dispatch_block_invoke_direct$VARIANT$mp + 28812 libdispatch.dylib              0x1836ea0ac dispatch_block_perform$VARIANT$mp + 10413 Foundation                     0x18473b878 __NSOQSchedule_f + 37614 libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1615 libdispatch.dylib              0x1836eaf08 _dispatch_continuation_pop$VARIANT$mp + 42816 libdispatch.dylib              0x1836e980c _dispatch_async_redirect_invoke$VARIANT$mp + 60417 libdispatch.dylib              0x1836efcf4 _dispatch_root_queue_drain + 60018 libdispatch.dylib              0x1836efa38 _dispatch_worker_thread3 + 12019 libsystem_pthread.dylib        0x18398b06c _pthread_wqthread + 126820 libsystem_pthread.dylib        0x18398ab6c start_wqthread + 4#6. Thread0  libsystem_pthread.dylib        0x18398ab68 start_wqthread + 122#7. GAIThread0  libsystem_kernel.dylib         0x183857568 mach_msg_trap + 81  libsystem_kernel.dylib         0x1838573e0 mach_msg + 722  CoreFoundation                 0x183d0b108 __CFRunLoopServiceMachPort + 1963  CoreFoundation                 0x183d08cd4 __CFRunLoopRun + 14244  CoreFoundation                 0x183c28c58 CFRunLoopRunSpecific + 4365  Foundation                     0x18465d594 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 3046  Foundation                     0x1846af56c -[NSRunLoop(NSRunLoop) run] + 887  AppName                      0x100878c50 +[GAI threadMain:] (GAI.m:241)8  Foundation                     0x18475f0f4 __NSThread__start__ + 9969  libsystem_pthread.dylib        0x18398c2b4 _pthread_body + 30810 libsystem_pthread.dylib        0x18398c180 _pthread_body + 31011 libsystem_pthread.dylib        0x18398ab74 thread_start + 4#8. Thread0  libsystem_kernel.dylib         0x183878d80 __workq_kernreturn + 81  libsystem_pthread.dylib        0x18398aeec _pthread_wqthread + 8842  libsystem_pthread.dylib        0x18398ab6c start_wqthread + 4#9. trust0  libsystem_kernel.dylib         0x183857568 mach_msg_trap + 81  libsystem_kernel.dylib         0x1838573e0 mach_msg + 722  libdispatch.dylib              0x1836f8890 _dispatch_mach_send_and_wait_for_reply + 6443  libdispatch.dylib              0x1836f8d3c dispatch_mach_send_with_result_and_wait_for_reply$VARIANT$mp + 564  libxpc.dylib                   0x1839c7d7c xpc_connection_send_message_with_reply_sync + 1965  Security                       0x18495147c securityd_message_with_reply_sync + 1766  Security                       0x1849517bc securityd_send_sync_and_do + 807  Security                       0x1849e39ec __SecTrustEvaluateIfNecessary_block_invoke_3 + 4328  Security                       0x1849b2034 SecOSStatusWith + 529  Security                       0x1849e3820 __SecTrustEvaluateIfNecessary_block_invoke_2 + 9610 libsystem_trace.dylib          0x1839a8b54 _os_activity_initiate_impl + 6011 Security                       0x1849e37b0 __SecTrustEvaluateIfNecessary_block_invoke + 26012 libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1613 libdispatch.dylib              0x1836eb618 _dispatch_queue_barrier_sync_invoke_and_complete + 5614 Security                       0x1849e08a4 SecTrustEvaluateIfNecessary + 52015 Security                       0x1849e0bcc SecTrustEvaluate + 6416 Security                       0x1849b195c build_trust_chains + 48417 CoreFoundation                 0x183c40938 __CFDictionaryApplyFunction_block_invoke + 2418 CoreFoundation                 0x183c27e98 CFBasicHashApply + 13219 CoreFoundation                 0x183c319ec CFDictionaryApplyFunction + 28820 Security                       0x1849b168c SecPKCS12Import + 24421 AppName                      0x100749e60 +[NetworkManager extractIdentity::] (NetworkManager.m:174)22 AppName                      0x100749084 __44-[NetworkManager authenticateWithSSLPinning]_block_invoke (NetworkManager.m:72)23 AppName                      0x100869a2c -[AFURLSessionManager URLSession:didReceiveChallenge:completionHandler:] (AFURLSessionManager.m:975)24 Foundation                     0x184739ba0 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 1625 Foundation                     0x184679894 -[NSBlockOperation main] + 7226 Foundation                     0x1846694c4 -[__NSOperationInternal _start:] + 84827 libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1628 libdispatch.dylib              0x1836ea200 _dispatch_block_invoke_direct$VARIANT$mp + 28829 libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1630 libdispatch.dylib              0x1836ea200 _dispatch_block_invoke_direct$VARIANT$mp + 28831 libdispatch.dylib              0x1836ea0ac dispatch_block_perform$VARIANT$mp + 10432 Foundation                     0x18473b878 __NSOQSchedule_f + 37633 libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 1634 libdispatch.dylib              0x1836eaf08 _dispatch_continuation_pop$VARIANT$mp + 42835 libdispatch.dylib              0x1836e980c _dispatch_async_redirect_invoke$VARIANT$mp + 60436 libdispatch.dylib              0x1836efcf4 _dispatch_root_queue_drain + 60037 libdispatch.dylib              0x1836efa38 _dispatch_worker_thread3 + 12038 libsystem_pthread.dylib        0x18398b06c _pthread_wqthread + 126839 libsystem_pthread.dylib        0x18398ab6c start_wqthread + 4#10. com.twitter.crashlytics.ios.MachExceptionServer0  libsystem_kernel.dylib         0x183857568 mach_msg_trap + 81  libsystem_kernel.dylib         0x1838573e0 mach_msg + 722  AppName                      0x1008f6bbc CLSMachExceptionServer (CLSMachException.c:180)3  libsystem_pthread.dylib        0x18398c2b4 _pthread_body + 3084  libsystem_pthread.dylib        0x18398c180 _pthread_body + 3105  libsystem_pthread.dylib        0x18398ab74 thread_start + 4#11. com.twitter.crashlytics.ios.logging0  AppName                      0x100910834 CLSUserLoggingWriteInternalKeyValue (CLSUserLogging.m:59)1  libdispatch.dylib              0x1836e2a54 _dispatch_call_block_and_release + 242  libdispatch.dylib              0x1836e2a14 _dispatch_client_callout + 163  libdispatch.dylib              0x1836ec96c _dispatch_queue_serial_drain$VARIANT$mp + 5284  libdispatch.dylib              0x1836ed2fc _dispatch_queue_invoke$VARIANT$mp + 3405  libdispatch.dylib              0x1836edd20 _dispatch_root_queue_drain_deferred_wlh$VARIANT$mp + 4046  libdispatch.dylib              0x1836f603c _dispatch_workloop_worker_thread$VARIANT$mp + 6447  libsystem_pthread.dylib        0x18398af1c _pthread_wqthread + 9328  libsystem_pthread.dylib        0x18398ab6c start_wqthread + 4#12. com.apple.NSURLConnectionLoader0  libsystem_kernel.dylib         0x183857568 mach_msg_trap + 81  libsystem_kernel.dylib         0x1838573e0 mach_msg + 722  CoreFoundation                 0x183d0b108 __CFRunLoopServiceMachPort + 1963  CoreFoundation                 0x183d08cd4 __CFRunLoopRun + 14244  CoreFoundation                 0x183c28c58 CFRunLoopRunSpecific + 4365  CFNetwork                      0x184517b08 -[__CoreSchedulingSetRunnable runForever] + 7806  Foundation                     0x18475f0f4 __NSThread__start__ + 9967  libsystem_pthread.dylib        0x18398c2b4 _pthread_body + 3088  libsystem_pthread.dylib        0x18398c180 _pthread_body + 3109  libsystem_pthread.dylib        0x18398ab74 thread_start + 4

sdqfghn · Answer

Hello, did you solved your issue ?

Jarosan · Answer

Our situation is pretty much identical to yours. Check out this thread: https://forums.developer.apple.com/thread/95387

iOS 11 CFNework Crash - TCPIOConnection::_handleTLSEvent(nw_tls_context*, tls_handshake_message_t, void () block_pointer, bool)

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