Thanks Quinn. We do not see the crash if InTune features is turned off. I found a work around by forcing NSURLCache to use in memory cache only and I dont see this crash anymore. But now we are seeing a different crash, also under InTune: Incident Identifier: 6400C4FE-FD18-4370-9E49-6955307AE2B4 Hardware Model: iPhone12,5 Process: Global Relay [24836] Path: /private/var/containers/Bundle/Application/70DEBAF8-99D4-4ADB-8ABB-E7A386D708A6/Global Relay.app/Global Relay Identifier: com.globalrelay.gr-app-im Version: 2.9.0 (33231) AppStoreTools: 14C17 AppVariant: 1:iPhone12,5:16 Beta: YES Code Type: ARM-64 (Native) Role: Non UI Parent Process: launchd [1] Coalition: com.globalrelay.gr-app-im [2457] Date/Time: 2023-02-23 15:40:48.0996 -0800 Launch Time: 2023-02-23 15:31:20.2067 -0800 OS Version: iPhone OS 16.3 (20D47) Release Type: User Baseband Version: 4.00.00 Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Subtype: KERN_MEMORY_ERROR at 0x0000000102fb002c Exception Codes: 0x000000000000000a, 0x0000000102fb002c VM Region Info: 0x102fb002c is in 0x102fb0000-0x103044000; bytes after start: 44 bytes before end: 606163 REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL MALLOC guard page 102fac000-102fb0000 [ 16K] ---/rwx SM=ZER ---> mapped file 102fb0000-103044000 [ 592K] r--/rw- SM=COW ...t_id=f5eefeef __TEXT 103044000-10304c000 [ 32K] r-x/rwx SM=COW ...eMAMSwiftStub Termination Reason: SIGNAL 10 Bus error: 10 Terminating Process: exc handler [24836] Triggered by Thread: 0 Kernel Triage: VM - pmap_enter retried due to resource shortage VM - pmap_enter retried due to resource shortage VM - pmap_enter retried due to resource shortage VM - pmap_enter retried due to resource shortage VM - pmap_enter retried due to resource shortage Thread 0 name: Thread 0 Crashed: 0 dyld 0x00000001abad4518 dyld4::PrebuiltLoaderSet::objcClassOpt() const + 0 (PrebuiltLoader.cpp:1617) 1 dyld 0x00000001abad448c dyld4::APIs::_dyld_for_each_objc_class(char const*, void (void*, bool, bool*) block_pointer) + 48 (DyldAPIs.cpp:2190) 2 libobjc.A.dylib 0x0000000186301ac8 getClass_impl(char const*) + 176 (objc-opt.mm:404) 3 libobjc.A.dylib 0x00000001862fee5c getClassExceptSomeSwift(char const*) + 24 (objc-runtime-new.mm:1790) 4 libobjc.A.dylib 0x00000001862fd77c look_up_class + 92 (objc-runtime-new.mm:7838) 5 Foundation 0x000000018750b970 NSClassFromString + 156 (NSObjCRuntime.m:0) 6 FrontBoardServices 0x00000001a2ef1e94 +[FBSSceneClientSettingsDiff diffFromSettings:toSettings:] + 96 (FBSSceneClientSettingsDiff.m:27) 7 FrontBoardServices 0x00000001a2ef19ac -[FBSScene _calloutQueue_comsumeLock_updateClientSettings:withTransitionContext:] + 128 (FBSScene.m:294) 8 FrontBoardServices 0x00000001a2ef18ac -[FBSScene updateClientSettings:withTransitionContext:] + 128 (FBSScene.m:117) 9 FrontBoardServices 0x00000001a2ef17fc -[FBSScene updateClientSettingsWithTransitionBlock:] + 116 (FBSScene.m:132) 10 FrontBoardServices 0x00000001a2ef175c -[FBSScene updateClientSettingsWithBlock:] + 124 (FBSScene.m:122) 11 UIKitCore 0x000000018f423230 -[FBSScene(UIApp) updateUIClientSettingsWithBlock:] + 168 (FBSScene+UIApp.m:48) 12 UIKitCore 0x000000018f7219c4 -[UIApplication _setIdleTimerDisabled:forReason:] + 188 (UIApplication.m:1900) 13 Foundation 0x0000000187565308 __NSFireTimer + 96 (NSTimer.m:280) 14 CoreFoundation 0x000000018d23d32c __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 32 (CFRunLoop.c:1797) 15 CoreFoundation 0x000000018d1f99a8 __CFRunLoopDoTimer + 940 (CFRunLoop.c:2402) 16 CoreFoundation 0x000000018d19d548 __CFRunLoopDoTimers + 288 (CFRunLoop.c:2560) 17 CoreFoundation 0x000000018d1eafa0 __CFRunLoopRun + 1896 (CFRunLoop.c:3120) 18 CoreFoundation 0x000000018d1efeb0 CFRunLoopRunSpecific + 612 (CFRunLoop.c:3418) 19 GraphicsServices 0x00000001c73e5368 GSEventRunModal + 164 (GSEvent.c:2196) 20 UIKitCore 0x000000018f6e5668 -[UIApplication _run] + 888 (UIApplication.m:3758) 21 UIKitCore 0x000000018f6e52cc UIApplicationMain + 340 (UIApplication.m:5348) 22 0x0000000103720b78 0x1034ac000 + 2575224 23 0x00000001023feac0 main + 640 (main.m:40) 24 dyld 0x00000001abae8960 start + 2528 (dyldMain.cpp:1170)

Sorry, post the reply too soon. The crash happened when the app is in the background for over an hour. We do have the app scheduled for background fetch every half an hour, without InTune it works well. I am not sure if this crash is related to the refresh, but it does have the setIdleTimerDisable call in the call stack. Was this part of the scheduled refresh triggered by OS? Thanks a lot for your help!

Interesting enough, I filed a dispute and resubmitted the app and it got approved.