We've started to see thousands of crashes on iOS 14.0 (a few on iOS 14.2) when our app is launched for a background session. It looks like CFNetwork is logging something.
Is this a bug in CFNetwork? Has anyone encountered a similar crash?
Exception Type:	EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000d466bbe9c
VM Region Info: 0xd466bbe9c is not in any region.	Bytes after previous region: 45741751965	Bytes before following region: 10629693796
			REGION TYPE											START - END						 [ VSIZE] PRT/MAX SHRMOD	REGION DETAIL
			MALLOC_NANO									 280000000-2a0000000				[512.0M] rw-/rwx SM=PRV	-->	GAP OF 0xd20000000 BYTES
			commpage (reserved)					 fc0000000-1000000000			 [	1.0G] ---/--- SM=NUL	...(unallocated)
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [202]
Triggered by Thread:	0
Thread 0 name:
Thread 0 Crashed:
0	 libobjc.A.dylib							 0x000000019422b1c0 objc_opt_isKindOfClass + 20 (objc-object.h:260)
1	 libsystem_trace.dylib				 0x0000000195dd60a4 _os_log_fmt_flatten_object + 816 (format.m:109)
2	 libsystem_trace.dylib				 0x0000000195de2500 _os_log_impl_flatten_and_send + 1716 (format.c:799)
3	 libsystem_trace.dylib				 0x0000000195de1e34 _os_log + 152 (log.c:2214)
4	 libsystem_trace.dylib				 0x0000000195de45e0 _os_log_impl + 12 (log.c:2228)
5	 CFNetwork										 0x0000000181078dd0 -[__NSURLBackgroundSession appWasLaunchedForBackgroundSession:] + 240 (BackgroundSession.mm:0)
6	 CoreFoundation								 0x0000000180949098 CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER + 20 (CFNotificationCenter.c:706)
7	 CoreFoundation								 0x0000000180949058 ___CFXRegistrationPost_block_invoke + 48 (CFNotificationCenter.c:173)
8	 CoreFoundation								 0x0000000180948650 _CFXRegistrationPost + 400 (CFNotificationCenter.c:198)
9	 CoreFoundation								 0x0000000180948048 _CFXNotificationPost + 696 (CFNotificationCenter.c:1071)
10	Foundation										 0x0000000181b67b20 -[NSNotificationCenter postNotificationName:object:userInfo:] + 60 (NSNotification.m:575)
11	CFNetwork										 0x000000018117bd40 +[NSURLSession _sendPendingCallbacksForSessionIdentifier:] + 64 (Session.mm:222)
12	UIKitCore										 0x000000018323e990 -[UIApplication _handleNonLaunchSpecificActions:forScene:withTransitionContext:completion:] + 2932 (UIApplication.m:10283)
13	UIKitCore										 0x0000000182750538 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:] + 476 (UIScene.m:1118)
14	UIKitCore										 0x0000000182751600 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:] + 220 (UIScene.m:1380)
15	UIKitCore										 0x0000000182d6ad84 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:] + 464 (UIApplicationSceneClientAgent.m:80)
16	FrontBoardServices						 0x000000018f2654b0 -[FBSScene updater:didUpdateSettings:withDiff:transitionContext:completion:] + 456 (FBSScene.m:547)
17	FrontBoardServices						 0x000000018f28dcec __94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2 + 124 (FBSWorkspaceScenesClient.m:533)
18	FrontBoardServices						 0x000000018f272410 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 232 (FBSWorkspace.m:355)
19	FrontBoardServices						 0x000000018f28dc38 __94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke + 368 (FBSWorkspaceScenesClient.m:532)
20	libdispatch.dylib						 0x000000018061f280 _dispatch_client_callout + 16 (object.m:559)
21	libdispatch.dylib						 0x00000001805c4b0c _dispatch_block_invoke_direct$VARIANT$mp + 224 (queue.c:468)
22	FrontBoardServices						 0x000000018f2b14b8 FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK + 40 (FBSSerialQueue.m:184)
23	FrontBoardServices						 0x000000018f2b1180 -[FBSSerialQueue _targetQueue_performNextIfPossible] + 404 (FBSSerialQueue.m:227)
24	FrontBoardServices						 0x000000018f2b1654 -[FBSSerialQueue _performNextFromRunLoopSource] + 28 (FBSSerialQueue.m:258)
25	CoreFoundation								 0x0000000180966240 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 24 (CFRunLoop.c:1967)
26	CoreFoundation								 0x0000000180966140 __CFRunLoopDoSource0 + 204 (CFRunLoop.c:2011)
27	CoreFoundation								 0x0000000180965488 __CFRunLoopDoSources0 + 256 (CFRunLoop.c:2048)
28	CoreFoundation								 0x000000018095fa40 __CFRunLoopRun + 776 (CFRunLoop.c:2925)
29	CoreFoundation								 0x000000018095f200 CFRunLoopRunSpecific + 572 (CFRunLoop.c:3242)
30	GraphicsServices							 0x0000000196a5a598 GSEventRunModal + 160 (GSEvent.c:2259)
31	UIKitCore										 0x0000000183225004 -[UIApplication _run] + 1052 (UIApplication.m:3270)
32	UIKitCore										 0x000000018322a5d8 UIApplicationMain + 164 (UIApplication.m:4739)
33	<app>					 0x00000001004853a4 main + 68 (AppDelegate.swift:26)
34	libdyld.dylib								 0x000000018063e598 start + 4
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