High Frequency of random crashes due to Firebase sdk

[jack45j]

Description

Since our app's release of a certain version update, there has been a huge amount of random crashes related to APM, such as:

• APMPersistentDictionary stringForKey:
• APMPBMeasurementBundle protoBuffer
• APMScreenViewReporter viewControllerDidDisappear:
• APMDatabase insertIfNotExistsRawEventMetadata:error:
• APMPersistedConfig stringForKey: _block_invoke
• APMEManager flagValueForFlagName:SDKName: _block_invoke
• APMValue initWithString
  and so on.

Specifically, these crashes started appearing in large numbers after an update that introduced a new resetDatabase() method. This method is called on some users' devices and always after Firebase.configure(). Here is the method:

extension CoreDataMainContext {
    func resetDatabase() {
        self.managedObjectContext.perform {
            do {
                try self.stack.persistentStoreCoordinator.managedObjectModel.entities.forEach { entity in
                    if let name = entity.name {
                        let fetch = NSFetchRequest<NSFetchRequestResult>(entityName: name)
                        let request = NSBatchDeleteRequest(fetchRequest: fetch)
                        try self.managedObjectContext.execute(request)
                    }
                }
                try self.managedObjectContext.save()
            } catch {
                print("Reset database failure with error: \(error.localizedDescription)")
            }
        }
    }
}

In my understanding, this resetDatabase() should only affect a specific CoreDataStack. Even if Firebase also uses SQLite, it shouldn't be affected, right? I noticed issue #12796 mentioned a similar situation, but it seems there hasn't been a conclusion yet.

I'm attaching some related stack traces here. If you need any other information or if there's something I might have done wrong, please let me know. Thanks for all your hard work for the community, you guys are really doing a great job.

stacktrace.zip

Reproducing the issue

No response

Firebase SDK Version

10.22.1

Xcode Version

15.3

Installation Method

Swift Package Manager

Firebase Product(s)

Analytics, Crashlytics, DynamicLinks

Targeted Platforms

iOS

Relevant Log Output

No response

If using Swift Package Manager, the project's Package.resolved

Expand Package.resolved snippet

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If using CocoaPods, the project's Podfile.lock

Expand Podfile.lock snippet

Replace this line with the contents of your Podfile.lock!

[pcfba]

We're looking into this. A couple questions:

1. In your stack traces, BBSCRUtility [CQyAouKZHVJpfDlh jnndIJCDUPkbiIxp] and store_shellcode() appear. What is BBSCRUtility?
2. Are you able to reproduce this crash in your app or a sample project? If so, does removing the call to resetDatabase() remove the crash?

[jack45j]

Sorry for the delayed response due to the crash issues we've been dealing with over the past couple of days.

Earlier today, we confirmed that these crashes, including the BBSCRUtility issue, were caused by an obfuscation tool provided by one of our suppliers. Over the past month, this supplier has consistently denied any issues with their tool, which is why we did not initially suspect or test it.

Most of the crash reports were related to APM, which is why I chose to open an issue here. After removing the obfuscation tool, the APM, store_shellcode, and BBSCRUtility issues have not reoccurred.

I apologize for any inconvenience and for taking up your time with this issue. I am also sorry for opening an issue here before thoroughly investigating the root cause on my end. 🙏