EXC_BAD_ACCESS FlagSynchronizer:63

[m1entus]

Describe the bug
Crash (synchronization issue)

SDK version
9.1.1

OS/platform
iOS

Additional context

Seems this is retain cycle issue:

self.throttler.runThrottled {
      // since going online was throttled, check the last called setOnline value and whether we can go online
      self.go(online: goOnline && self.canGoOnline, reasonOnlineUnavailable: self.reasonOnlineUnavailable(goOnline: goOnline), completion: completion)
}

here you are capturing self inside throttler:
LDClient -> throttler -> runQueue -> runThrottled -> self (LDClient)

this method should look like this:

self.throttler.runThrottled { [weak self] in
      guard let self else {
          completion?()
          return
      }
      // since going online was throttled, check the last called setOnline value and whether we can go online
      self.go(online: goOnline && self.canGoOnline, reasonOnlineUnavailable: self.reasonOnlineUnavailable(goOnline: goOnline), completion: completion)
}

[tanderson-ld]

Hi @m1entus , how frequently are you encountering this issue? Also, thank you for digging deeply and providing an option to fix the issue.

[m1entus]

Just got one crash in Sentry analitycs - so preety rare, but maybe this also can caouse because app is entering background and you are dosing some async action, hard to say really.

[tanderson-ld]

@m1entus , could you provide a rough estimate of number of sessions your customer base runs per day? That will help us evaluate the frequency in a relative percentage.

[m1entus]

@tanderson-ld To be honest it appears only once so far