iOS Agent v4.4.0.x causes warning on a background thread UIApplication isProtectedDataAvailable. Why?

[Gaurav.Soni]

If you are using v.4.4.0.x iOS agent with latest Xcode 9beta 6, you might see the following warning from Apple's Main Thread Checker.

AppDynamics crash
=================================================================
Main Thread Checker: UI API called on a background thread: -[UIApplication isProtectedDataAvailable]
PID: 16226, TID: 917031, Thread name: (none), Queue name: com.appdynamics.EumInstrumentation.BeaconDispatcher, QoS: 0
Backtrace:
4   Workplace                           0x000000010a1386ea +[ADEumInstrumentation isProtectedDataAvailable] + 72
5   Workplace                           0x000000010a12258a __40-[ADEumBeaconDispatcher flushBeaconsNow]_block_invoke + 40
6   libdispatch.dylib                   0x00000001135353f7 _dispatch_call_block_and_release + 12
7   libdispatch.dylib                   0x000000011353643c _dispatch_client_callout + 8
8   libdispatch.dylib                   0x000000011353e95b _dispatch_queue_serial_drain + 1162
9   libdispatch.dylib                   0x000000011353f2df _dispatch_queue_invoke + 336
10  libdispatch.dylib                   0x000000011353b07d _dispatch_queue_override_invoke + 733
11  libdispatch.dylib                   0x00000001135421f9 _dispatch_root_queue_drain + 772
12  libdispatch.dylib                   0x0000000113541e97 _dispatch_worker_thread3 + 132
13  libsystem_pthread.dylib             0x00000001139fa5a2 _pthread_wqthread + 1299
14  libsystem_pthread.dylib             0x00000001139fa07d start_wqthread + 13

These types of issues are now displayed in Xcode 9 as purple issues - more than warnings but less than fatal errors.

In conversations with people that have had some knowledge of decisions at Apple, it appears that they were originally going to make these hard errors, but it appears that Flurry has the same problem and Apple seemed to be unwilling to stop apps containing Flurry - just too many. As people move to Xcode 9 they will start seeing these warnings as well and have questions.

As this is a warning this should not crash the application. This issue has been identified and has been worked on. The fix is going to be available in v4.4.1.

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