Crash: Dozen of crashes inside RCNFetch.m line 221 __81-[RCNConfigFetch refreshInstanceIDTokenAndFetchCheckInInfoWithCompletionHandler:]

[dimaosa]

Describe your environment

• Xcode version: 11.2.1
• Firebase SDK version and Firebase Component:

 - FirebaseRemoteConfig (4.4.3):
    - FirebaseABTesting (~> 3.1)
    - FirebaseAnalyticsInterop (~> 1.4)
    - FirebaseCore (~> 6.2)
    - FirebaseInstanceID (~> 4.2)
    - GoogleUtilities/Environment (~> 6.2)
    - "GoogleUtilities/NSData+zlib (~> 6.2)"
    - Protobuf (>= 3.9.2, ~> 3.9)

Describe the problem

We are receiving dozen of crashes after updating Pods ->

Steps to reproduce:

1. What happened?
   Crashes occur randomly and we are not able to reproduce it in debug.

Around 4% of users have this crash.

Relevant Code:

Crashed: com.apple.main-thread
0  **                       0x104fd81f4 __81-[RCNConfigFetch refreshInstanceIDTokenAndFetchCheckInInfoWithCompletionHandler:]_block_invoke_2 + 221 (RCNFetch.m:221)
1  libdispatch.dylib              0x18ae8a610 _dispatch_call_block_and_release + 24
2  libdispatch.dylib              0x18ae8b184 _dispatch_client_callout + 16
3  libdispatch.dylib              0x18ae3d190 _dispatch_main_queue_callback_4CF$VARIANT$mp + 1044
4  CoreFoundation                 0x18b13c5e4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
5  CoreFoundation                 0x18b1375d8 __CFRunLoopRun + 2004
6  CoreFoundation                 0x18b136adc CFRunLoopRunSpecific + 464
7  GraphicsServices               0x1950bc328 GSEventRunModal + 104
8  UIKitCore                      0x18f231ae0 UIApplicationMain + 1936
9  ***                     0x104845308 main + 22 (**.swift:22)
10 libdyld.dylib                  0x18afc0360 start + 4

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[rizafran]

Hi @dimaosa, looks like it's related to this one. Could you try to update your SDK to the latest version and see if you'll still encounter the issue?

[dimaosa]

Hi @rizafran , I will update to latest SDK and check if we would encounter this issue again, thanks

[ryanwilson]

Any luck @dimaosa?

[dimaosa]

Hi @ryanwilson , we are still receiving crashes in this method, even when we used latest libs, I will provide more details on Monday

[dimaosa]

With following libs versions, we still receive the same crash

  - FirebaseRemoteConfig (4.4.6):
    - FirebaseABTesting (~> 3.1)
    - FirebaseAnalyticsInterop (~> 1.4)
    - FirebaseCore (~> 6.2)
    - FirebaseInstanceID (~> 4.2)
    - GoogleUtilities/Environment (~> 6.2)
    - "GoogleUtilities/NSData+zlib (~> 6.2)"
    - Protobuf (>= 3.9.2, ~> 3.9)

[dmandar]

Hi, this code has been updated in #4745 . Please retest in the next release and reopen if still an issue.

[dimaosa]

Thanks @dmandar , I will wait for the next release