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I was able to grab a log... does this help identify the issue?Sep 20 14:00:20 Craigs-iPhone assertiond[60] : [rMove:1257] Activate assertion: Sep 20 14:00:20 Craigs-iPhone powerd[33] : Process assertiond.60 Created SystemIsActive "rMove:1257:87-AF5F00CC-AF9B-432A-8A6E-0731256F86BA [com.apple.nsurlsessiond.handlesession com.rsginc.rmove.sending.Heart] [0x125d4b0a0]" age:00:00:00 id:51539648732 [System: PrevIdle SysAct] Sep 20 14:00:20 Craigs-iPhone rMove[1257] : [CDVTimer][heartbeat] 0.234008ms Sep 20 14:00:20 Craigs-iPhone rMove(libswiftFoundation.dylib)[1257] : LLLLLLLLLLLLLLAAAAAAAAAAAAAAAAUUUUUUUUUUUUUUUUUUUUUUNNNNNNNNNNNNNNNNNNNNNNCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHH w/ Optional([AnyHashable("UIApplicationLaunchOptionsURLSessionKey"): com.rsginc.rmove.sending.Heart]) Sep 20 14:00:20 Craigs-iPhone rMove(libswiftFoundation.dylib)[1257] <Notice>: Launched in: bg:true active:false inactive:false Sep 20 14:00:20 Craigs-iPhone rMove(UIKitCore)[1257] <Notice>: Warning: Application delegate received call to -application:handleEventsForBackgroundURLSession:completionHandler: but the completion handler was never called. Sep 20 14:00:20 Craigs-iPhone nsurlsessiond[87] <Notice>: Received signal to deliver pending events for client session: <<private>>.<<private>> Sep 20 14:00:20 Craigs-iPhone nsurlsessiond[87] <Notice>: <<private>>.<(null)> Lost connection to app -- connection interrupted or invalidatedSep 20 14:00:20 Craigs-iPhone assertiond[60] : [rMove:1257] Longest remaining time-limited assertion is with duration 30.0s Sep 20 14:00:21 Craigs-iPhone dasd(DuetActivitySchedulerDaemon)[88] : COMPLETED com.apple.CFNetwork-cc-87-1139-Task <67DDB876-180D-4517-B91A-A2115934C80E>...<1>:404391 at priority 10 ! Sep 20 14:00:21 Craigs-iPhone dasd(DuetActivitySchedulerDaemon)[88] : NO LONGER RUNNING com.apple.CFNetwork-cc-87-1139-Task <67DDB876-180D-4517-B91A-A2115934C80E>...<1>:404391 ...Tasks running in group [] are 0! Sep 20 14:00:33 Craigs-iPhone assertiond[60] : [rMove:1257] Longest remaining time-limited assertion is with duration 30.0s Sep 20 14:00:50 Craigs-iPhone dasd(DuetActivitySchedulerDaemon)[88] : com.apple.healthd.awd-submission-manager.heart-daily-analytics:12CF77:[ {name: FileProtectionPolicy, policyWeight: 0.010, response: {Decision: Absolutely Must Not Proceed, Score: 0.00, Rationale: [{classALocked == 1 AND activityFileProtection == }]}} ], FinalDecision: Absolutely Must Not Proceed} Sep 20 14:01:04 Craigs-iPhone assertiond[60] : [rMove:1257] Forcing crash report with description: rMove:1257 has active assertions beyond permitted time: (owner: nsurlsessiond:87) Sep 20 14:01:04 Craigs-iPhone symptomsd(SymptomEvaluator)[119] : Can't get most elevated app state from dictionary { BKSApplicationStateExtensionKey = 0; SBApplicationStateDisplayIDKey = "com.rsginc.rmove"; SBApplicationStateKey = 0; SBApplicationStateProcessIDKey = 1257; SBApplicationStateRunningReasonsKey = ( { SBApplicationStateRunningReasonAssertionIdentifierKey = "com.apple.nsurlsessiond.handlesession com.rsginc.rmove.sending.Heart"; SBApplicationStateRunningReasonAssertionReasonKey = 11; } ); } Sep 20 14:01:05 Craigs-iPhone assertiond[60] : Server invalidated Sep 20 14:01:05 Craigs-iPhone assertiond[60] : Client relinquished Sep 20 14:01:05 Craigs-iPhone powerd[33] : Process assertiond.60 Released SystemIsActive "rMove:1257:87-AF5F00CC-AF9B-432A-8A6E-0731256F86BA [com.apple.nsurlsessiond.handlesession com.rsginc.rmove.sending.Heart] [0x125d4b0a0]" age:00:00:45 id:51539648732 [System: No Assertions]

I believe I fixed it - the answer was in this StackOverflow post; changing my session identifier got iOS to start calling handleEventsForBackgroundURLSession.Edit: unmarked as the correct answer; not fixed, started happening again with the new session ids.

> Was the breakage associated with your old session identifier confined to one device?A couple devices that I was using for development, but not a third. This was development code, so it had limited installations.> Also, if you create your session and call -invalidateAndCancel on it, does that fix the problem?I tried calling invalidateAndCancel from urlSessionDidFinishEvents if the background completion handler isn't set, but it didn't help - urlSessionDidFinishEvents was called on the next pass without a call to handleEventsForBackgroundURLSession.

I'm doing #2 - my 'swizzle' function actually swizzles (replaces) if the original method is defined, otherwise it adds the new method; here's a log line from the above code:9/16/19, 9:48:24 AM rMove(libswiftFoundation.dylib)[443]: swizz added application:handleEventsForBackgroundURLSession:completionHandler:

Thank you - I think you nailed it, I think it's the background session completion handler that's getting dropped; it looks like my handleEventsForBackgroundURLSession function is not getting called, so I'm not getting the completion handler.We're using Cordova, so I'm swizzling in this function because we don't have access to the app delegate class. I'm doing this for push notification callbacks, and those are working fine, but I don't see why this function is not getting called.In Cordova's pluginInitialize, I'm calling: static let bgSendingIsSetup:Bool = { NSLog("CordovaInterface bgSendingIsSetup") let app: UIApplication = UIApplication.shared let appDelegate = app.delegate as! CDVAppDelegate let clazz = CDVAppDelegate.self appDelegate.swizzle(clazz, #selector(appDelegate.application(_:handleEventsForBackgroundURLSession:completionHandler:)), #selector(appDelegate.swizzled_application(_:handleEventsForBackgroundURLSession:completionHandler:))) return true }()That swizzle function is:extension CDVAppDelegate { func swizzle(_ clazz:AnyClass, _ originalSelector:Selector, _ swizzledSelector:Selector) -> () { let original = class_getInstanceMethod(clazz, originalSelector) let swizzled = class_getInstanceMethod(clazz, swizzledSelector)! if let origMethod = original { method_exchangeImplementations(origMethod, swizzled) Log.log("swizz swapped \(originalSelector) w/ \(swizzledSelector)", true) } else { class_addMethod(clazz, originalSelector, method_getImplementation(swizzled), method_getTypeEncoding(swizzled)) Log.log("swizz added \(originalSelector)", true) } }And this is the signature for my replacement function, which looks right to me: @objc dynamic func swizzled_application(_ application: UIApplication, handleEventsForBackgroundURLSession identifier: String, completionHandler: @escaping () -> Void) { Log.log("hEFBUS \(identifier)", true) ...... but the hEFBUS line never actually gets logged.I'm swizzling the push notification functions (didRegisterForRemoteNotificationsWithDeviceToken, didFailToRegisterForRemoteNotificationsWithError, and didReceiveRemoteNotification:fetchCompletionHandler) at the same point and using the same swizzle function, and those are working... what am I missing?

You're right - it's actually 0x8badf00d, not 0x8b4df00d, my b4d.Here's a recent trace:{"app_name":"rMove","timestamp":"2019-09-12 02:00:56.92 -0400","app_version":"5.3.5890","slice_uuid":"47f8b9fa-0a56-37d2-a929-0750329fa1e6","adam_id":0,"build_version":"5.3.5890","bundleID":"com.rsginc.rmove","share_with_app_devs":true,"is_first_party":false,"bug_type":"109","os_version":"iPhone OS 12.4.1 (16G102)","incident_id":"74EEC9D3-016E-44A6-955F-853FA9DC37D3","name":"rMove"} Incident Identifier: 74EEC9D3-016E-44A6-955F-853FA9DC37D3 CrashReporter Key: 8da83f2024255f42b27b65fe4f430f5c6306c40f Hardware Model: iPhone10,1 Process: rMove [2651] Path: /private/var/containers/Bundle/Application/A8A2A142-A0F8-4AF1-A26D-912F6DB12C96/rMove.app/rMove Identifier: com.rsginc.rmove Version: 5.3.5890 (5.3.5890) Code Type: ARM-64 (Native) Role: Non UI Parent Process: launchd [1] Coalition: com.rsginc.rmove [1005] Date/Time: 2019-09-12 02:00:56.7367 -0400 Launch Time: 2019-09-12 01:00:16.5818 -0400 OS Version: iPhone OS 12.4.1 (16G102) Baseband Version: 3.70.01 Report Version: 104 Exception Type: EXC_CRASH (SIGKILL) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Termination Reason: Namespace ASSERTIOND, Code 0x8badf00d Triggered by Thread: 0 Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libsystem_kernel.dylib 0x0000000189a280f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000189a275a0 mach_msg + 72 2 CoreFoundation 0x0000000189e28120 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x0000000189e23030 __CFRunLoopRun + 1360 4 CoreFoundation 0x0000000189e227c0 CFRunLoopRunSpecific + 436 5 GraphicsServices 0x000000018c02379c GSEventRunModal + 104 6 UIKitCore 0x00000001b68f3c38 UIApplicationMain + 212 7 rMove 0x0000000104d8915c 0x104d84000 + 20828 8 libdyld.dylib 0x00000001898e68e0 start + 4 Thread 1 name: com.apple.uikit.eventfetch-thread Thread 1: 0 libsystem_kernel.dylib 0x0000000189a280f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000189a275a0 mach_msg + 72 2 CoreFoundation 0x0000000189e28120 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x0000000189e23030 __CFRunLoopRun + 1360 4 CoreFoundation 0x0000000189e227c0 CFRunLoopRunSpecific + 436 5 Foundation 0x000000018a7f098c -[NSRunLoop+ 31116 (NSRunLoop) runMode:beforeDate:] + 300 6 Foundation 0x000000018a7f081c -[NSRunLoop+ 30748 (NSRunLoop) runUntilDate:] + 96 7 UIKitCore 0x00000001b69d9754 -[UIEventFetcher threadMain] + 136 8 Foundation 0x000000018a91d4a0 __NSThread__start__ + 984 9 libsystem_pthread.dylib 0x0000000189ab52c0 _pthread_body + 128 10 libsystem_pthread.dylib 0x0000000189ab5220 _pthread_start + 44 11 libsystem_pthread.dylib 0x0000000189ab8cdc thread_start + 4 Thread 2: 0 libsystem_pthread.dylib 0x0000000189ab8cd0 start_wqthread + 0 Thread 3 name: JavaScriptCore bmalloc scavenger Thread 3: 0 libsystem_kernel.dylib 0x0000000189a32ee4 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x0000000189ab24a4 _pthread_cond_wait$VARIANT$armv81 + 628 2 libc++.1.dylib 0x0000000189009090 std::__1::condition_variable::wait+ 32912 (std::__1::unique_lock<std::__1::mutex>&) + 24 3 JavaScriptCore 0x00000001910b6de0 void std::__1::condition_variable_any::wait<std::__1::unique_lock<bmalloc::Mutex> >+ 564704 (std::__1::unique_lock<bmalloc::Mutex>&) + 108 4 JavaScriptCore 0x00000001910badd4 bmalloc::Scavenger::threadRunLoop+ 581076 () + 176 5 JavaScriptCore 0x00000001910ba54c bmalloc::Scavenger::Scavenger+ 578892 (std::__1::lock_guard<bmalloc::Mutex>&) + 0 6 JavaScriptCore 0x00000001910bbf8c std::__1::__thread_specific_ptr<std::__1::__thread_struct>::set_pointer+ 585612 (std::__1::__thread_struct*) + 0 7 libsystem_pthread.dylib 0x0000000189ab52c0 _pthread_body + 128 8 libsystem_pthread.dylib 0x0000000189ab5220 _pthread_start + 44 9 libsystem_pthread.dylib 0x0000000189ab8cdc thread_start + 4 Thread 4 name: WebThread Thread 4: 0 libsystem_kernel.dylib 0x0000000189a280f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000189a275a0 mach_msg + 72 2 CoreFoundation 0x0000000189e28120 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x0000000189e23030 __CFRunLoopRun + 1360 4 CoreFoundation 0x0000000189e227c0 CFRunLoopRunSpecific + 436 5 WebCore 0x0000000192b15fc4 RunWebThread+ 3874756 (void*) + 600 6 libsystem_pthread.dylib 0x0000000189ab52c0 _pthread_body + 128 7 libsystem_pthread.dylib 0x0000000189ab5220 _pthread_start + 44 8 libsystem_pthread.dylib 0x0000000189ab8cdc thread_start + 4 Thread 5 name: com.apple.CFStream.LegacyThread Thread 5: 0 libsystem_kernel.dylib 0x0000000189a280f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000189a275a0 mach_msg + 72 2 CoreFoundation 0x0000000189e28120 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x0000000189e23030 __CFRunLoopRun + 1360 4 CoreFoundation 0x0000000189e227c0 CFRunLoopRunSpecific + 436 5 CoreFoundation 0x0000000189e3b500 _legacyStreamRunLoop_workThread + 260 6 libsystem_pthread.dylib 0x0000000189ab52c0 _pthread_body + 128 7 libsystem_pthread.dylib 0x0000000189ab5220 _pthread_start + 44 8 libsystem_pthread.dylib 0x0000000189ab8cdc thread_start + 4 Thread 6 name: com.apple.NSURLConnectionLoader Thread 6: 0 libsystem_kernel.dylib 0x0000000189a280f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x0000000189a275a0 mach_msg + 72 2 CoreFoundation 0x0000000189e28120 __CFRunLoopServiceMachPort + 236 3 CoreFoundation 0x0000000189e23030 __CFRunLoopRun + 1360 4 CoreFoundation 0x0000000189e227c0 CFRunLoopRunSpecific + 436 5 CFNetwork 0x000000018a43c74c -[__CoreSchedulingSetRunnable runForever] + 216 6 Foundation 0x000000018a91d4a0 __NSThread__start__ + 984 7 libsystem_pthread.dylib 0x0000000189ab52c0 _pthread_body + 128 8 libsystem_pthread.dylib 0x0000000189ab5220 _pthread_start + 44 9 libsystem_pthread.dylib 0x0000000189ab8cdc thread_start + 4 Thread 7 name: IndexedDatabase Server Thread 7: 0 libsystem_kernel.dylib 0x0000000189a32ee4 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x0000000189ab24a4 _pthread_cond_wait$VARIANT$armv81 + 628 2 JavaScriptCore 0x000000019107d88c ***::ThreadCondition::timedWait+ 329868 (***::Mutex&, ***::WallTime) + 80 3 JavaScriptCore 0x0000000191064514 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda<bool ()> const&, ***::ScopedLambda<void + 226580 ()> const&, ***::TimeWithDynamicClockType const&) + 2004 4 JavaScriptCore 0x0000000191038358 bool ***::Condition::waitUntil<***::Lock>+ 45912 (***::Lock&, ***::TimeWithDynamicClockType const&) + 184 5 JavaScriptCore 0x000000019103fb30 ***::CrossThreadQueue<***::CrossThreadTask>::waitForMessage+ 76592 () + 116 6 JavaScriptCore 0x000000019103fa88 ***::CrossThreadTaskHandler::taskRunLoop+ 76424 () + 216 7 JavaScriptCore 0x000000019107bb30 ***::Thread::entryPoint+ 322352 (***::Thread::NewThreadContext*) + 260 8 JavaScriptCore 0x000000019107d03c ***::wtfThreadEntryPoint+ 327740 (void*) + 12 9 libsystem_pthread.dylib 0x0000000189ab52c0 _pthread_body + 128 10 libsystem_pthread.dylib 0x0000000189ab5220 _pthread_start + 44 11 libsystem_pthread.dylib 0x0000000189ab8cdc thread_start + 4 Thread 8 name: WebCore: LocalStorage Thread 8: 0 libsystem_kernel.dylib 0x0000000189a32ee4 __psynch_cvwait + 8 1 libsystem_pthread.dylib 0x0000000189ab24a4 _pthread_cond_wait$VARIANT$armv81 + 628 2 JavaScriptCore 0x000000019107d88c ***::ThreadCondition::timedWait+ 329868 (***::Mutex&, ***::WallTime) + 80 3 JavaScriptCore 0x0000000191064514 ***::ParkingLot::parkConditionallyImpl(void const*, ***::ScopedLambda<bool ()> const&, ***::ScopedLambda<void + 226580 ()> const&, ***::TimeWithDynamicClockType const&) + 2004 4 WebKitLegacy 0x0000000194165bdc bool ***::Condition::waitUntil<***::Lock>+ 666588 (***::Lock&, ***::TimeWithDynamicClockType const&) + 184 5 WebKitLegacy 0x00000001941688d8 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 + 678104 ()> const&)&&, ***::WallTime) + 156 6 WebKitLegacy 0x0000000194167ef4 WebCore::StorageThread::threadEntryPoint+ 675572 () + 68 7 JavaScriptCore 0x000000019107bb30 ***::Thread::entryPoint+ 322352 (***::Thread::NewThreadContext*) + 260 8 JavaScriptCore 0x000000019107d03c ***::wtfThreadEntryPoint+ 327740 (void*) + 12 9 libsystem_pthread.dylib 0x0000000189ab52c0 _pthread_body + 128 10 libsystem_pthread.dylib 0x0000000189ab5220 _pthread_start + 44 11 libsystem_pthread.dylib 0x0000000189ab8cdc thread_start + 4 Thread 9: 0 libsystem_pthread.dylib 0x0000000189ab8cd0 start_wqthread + 0 Thread 0 crashed with ARM Thread State (64-bit): x0: 0x0000000010004005 x1: 0x0000000007000806 x2: 0x0000000000000000 x3: 0x0000000000000c00 x4: 0x0000000000001e03 x5: 0x00000000ffffffff x6: 0x0000000000000000 x7: 0x0000000000000000 x8: 0x00000000fffffbbf x9: 0x0000000007000000 x10: 0x0000000007000000 x11: 0x000000b2f52e890c x12: 0x00000000016e3600 x13: 0x0000000000338732 x14: 0x0000000000003100 x15: 0x0000310000000000 x16: 0xffffffffffffffe1 x17: 0x0000000000000001 x18: 0x0000000000000000 x19: 0x0000000000000000 x20: 0x00000000ffffffff x21: 0x0000000000001e03 x22: 0x0000000000000c00 x23: 0x000000016b07ad10 x24: 0x0000000007000806 x25: 0x0000000000000000 x26: 0x0000000007000806 x27: 0x0000000000000c00 x28: 0x0000000000000001 fp: 0x000000016b07ac00 lr: 0x0000000189a275a0 sp: 0x000000016b07abb0 pc: 0x0000000189a280f4 cpsr: 0x60000000