UI API called on a background thread: -[UIApplication isProtectedDataAvailable]

[plu]

Environment

• Xcode version: 9
• Firebase SDK version
  • FirebaseAnalytics (4.0.3):
  • FirebaseAuth (4.1.1):
  • FirebaseCore (4.0.6):
  • FirebaseDatabase (4.0.2):
  • FirebaseInstanceID (2.0.2):
  • FirebaseMessaging (2.0.2):
  • FirebaseRemoteConfig (2.0.2):
  • FirebaseStorage (2.0.1):
  • FirebaseUI/Database (4.2.0):
• Firebase Product: analytics (I guess)

Problem

Xcode 9 emits a new warning:

Main Thread Checker: UI API called on a background thread: -[UIApplication isProtectedDataAvailable]
PID: 23463, TID: 3630221, Thread name: (none), Queue name: com.google.fira.worker, QoS: 9
Backtrace:
4   Bittrex                             0x0000000100400144 -[FIRASqliteStore monitorContextForDatabaseOperation:] + 476
5   Bittrex                             0x0000000100400350 -[FIRASqliteStore setDatabaseError:operation:] + 92
6   Bittrex                             0x00000001003fd918 -[FIRASqliteStore numberForQuery:parameterValues:error:] + 448
7   Bittrex                             0x000000010041fde8 -[FIRAMeasurement hasDataToUpload] + 60
8   Bittrex                             0x0000000100416fdc -[FIRAMeasurement updateSchedule] + 420
9   Bittrex                             0x0000000100420ee0 -[FIRAMeasurement networkRemoteConfigFetchCompletionHandler:data:error:] + 1588
10  Bittrex                             0x0000000100420828 __36-[FIRAMeasurement fetchRemoteConfig]_block_invoke + 120
11  libdispatch.dylib                   0x000000010583d49c _dispatch_call_block_and_release + 24
12  libdispatch.dylib                   0x000000010583d45c _dispatch_client_callout + 16
13  libdispatch.dylib                   0x000000010584c110 _dispatch_queue_serial_drain + 692
14  libdispatch.dylib                   0x00000001058409a4 _dispatch_queue_invoke + 332
15  libdispatch.dylib                   0x000000010584d104 _dispatch_root_queue_drain_deferred_wlh + 424
16  libdispatch.dylib                   0x0000000105854100 _dispatch_workloop_worker_thread + 652
17  libsystem_pthread.dylib             0x0000000181c9afe0 _pthread_wqthread + 932
18  libsystem_pthread.dylib             0x0000000181c9ac30 start_wqthread + 4

Steps to reproduce:

• Enable in scheme: Run -> Diagnostics -> [x] Main Thread Checker

I can't say when exactly it happened.

This issue is probably also not that important, unless Apple decides in the future to raise in exception in -[UIApplication isProtectedDataAvailable] when called from another thread than the main thread.

[JoeySlomowitz]

I'm having this issue too! Thanks for addressing it.

[imdadahad]

Is there a solution?

[ItsMeSandu]

I think that i have the same Problem:

Enviroment

• XCode 9 (9A235)
• Swift 3.2
• Firebase (= 4.0.1)
• Firebase/Core (= 4.0.1)
• Firebase/Crash (= 4.0.1)
• Firebase/Messaging (= 4.0.1)
• Firebase/Performance (= 4.0.1)
• Firebase/RemoteConfig (= 4.0.1)

Other

my test always fails with the following info:

Testing failed:
Early unexpected exit, operation never finished bootstrapping - no restart will be attempted
** TEST FAILED **
[11:42:39]: Exit status: 65

maybe this info help you out.

[paulb777]

@PetresS You're seeing #69. Updating to the latest Firebase should address it for you.

[rohanvasishth]

I have updated to the latest firebase version but I am still facing the same issue. My firebase version is 4.1.1. @paulb777

[paulb777]

@rohanvasishth The latest Firebase version is 4.3.0.

[rohanvasishth]

I just upgraded to 4.3.0 and the issue still persists. @paulb777

[paulb777]

@rohanvasishth As discussed above, some UI API called on a background thread issues were addressed in recent releases. The one with FIRASqliteStore in the backtrace is still under investigation. If you have a different backtrace with the latest release, please open another issue.