Crash in -[FIRMessagingRmq2PersistentStore openDatabase:] caused by Messaging setup

[REQUIRED] Step 2: Describe your environment

• Xcode version: 8.3.3
• Firebase SDK version: 4.0.4
• Library version: 4.0.4
• Firebase Product: Messaging

[REQUIRED] Step 3: Describe the problem

Since the migration to Firebase SDK v4 I'm facing intermittent (2-3% DAU) EXC_BREAKPOINT crashes in [FIRMessagingRmq2PersistentStore openDatabase:]

Steps to reproduce:

Code is setup as in https://github.com/firebase/quickstart-ios/blob/master/messaging/MessagingExampleSwift/AppDelegate.swift

Running on main thread:

FirebaseApp.configure()
Messaging.messaging().delegate = self
Messaging.messaging().shouldEstablishDirectChannel = false

Relevant Code:

Relevant threads in stack trace:

#0. Crashed: com.apple.main-thread
0  MyApp                          0x1006ae45c -[FIRMessagingRmq2PersistentStore openDatabase:] + 4302365788
1  MyApp                          0x1006ad770 -[FIRMessagingRmq2PersistentStore initWithDatabaseName:] + 4302362480
2  MyApp                          0x1006b016c -[FIRMessagingRmqManager initWithDatabaseName:] + 4302373228
3  MyApp                          0x1006977a8 -[FIRMessaging setupRmqManager] + 4302272424
4  MyApp                          0x100697144 -[FIRMessaging start] + 4302270788
5  MyApp                          0x100696e28 __25+[FIRMessaging messaging]_block_invoke + 4302269992
6  libswiftCoreData.dylib         0x1806629a0 (Missing)
7  libswiftCoreData.dylib         0x1806636cc (Missing)
8  MyApp                          0x100696dac +[FIRMessaging messaging] + 4302269868
9  MyApp                          0x100696798 +[FIRMessaging(FIRApp) didReceiveConfigureSDKNotification:] + 4302268312
10 libswiftCoreData.dylib         0x1817455f4 (Missing)
11 libswiftCoreData.dylib         0x181744d08 (Missing)
12 libswiftCoreData.dylib         0x181744a84 (Missing)
13 libswiftCoreData.dylib         0x1817b37a8 (Missing)
14 libswiftCoreData.dylib         0x18168895c (Missing)
15 libswiftCoreData.dylib         0x18219b970 (Missing)
16 MyApp                          0x10066915c +[FIRApp sendNotificationsToSDKs:] + 4302082396
17 MyApp                          0x1006680fc +[FIRApp configureDefaultAppWithOptions:sendingNotifications:] + 4302078204
18 MyApp                          0x100667d90 +[FIRApp configure] + 4302077328
19 MyApp                          0x1000d5944 specialized AppManager.handleFinishLaunching(application : UIApplication, launchOptions : [UIApplicationLaunchOptionsKey : Any]?) -> Bool (AppManager.swift:48)
20 MyApp                          0x1000d2018 AppManager.handleFinishLaunching(application : UIApplication, launchOptions : [UIApplicationLaunchOptionsKey : Any]?) -> Bool (AppManager.swift)
21 MyApp                          0x10038e2e8 specialized AppDelegate.application(UIApplication, didFinishLaunchingWithOptions : [UIApplicationLaunchOptionsKey : Any]?) -> Bool (AppDelegate.swift:36)
22 MyApp                          0x10038cc88 @objc AppDelegate.application(UIApplication, didFinishLaunchingWithOptions : [UIApplicationLaunchOptionsKey : Any]?) -> Bool (AppDelegate.swift)
23 UIKit                          0x18794de48 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 380
24 UIKit                          0x187b5a37c -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3452
25 UIKit                          0x187b5fe24 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1684
26 UIKit                          0x187b748b0 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke.3147 + 48
27 UIKit                          0x187b5d0b8 -[UIApplication workspaceDidEndTransaction:] + 168
28 FrontBoardServices             0x183354884 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 36
29 FrontBoardServices             0x1833546f0 -[FBSSerialQueue _performNext] + 176
30 FrontBoardServices             0x183354aa0 -[FBSSerialQueue _performNextFromRunLoopSource] + 56
31 libswiftCoreData.dylib         0x18175942c (Missing)
32 libswiftCoreData.dylib         0x181758d9c (Missing)
33 libswiftCoreData.dylib         0x1817569a8 (Missing)
34 libswiftCoreData.dylib         0x181686da4 (Missing)
35 UIKit                          0x187946fc8 -[UIApplication _run] + 652
36 UIKit                          0x187941c9c UIApplicationMain + 208
37 MyApp                          0x10038ddb8 main (AppDelegate.swift:12)
38 libswiftCoreData.dylib         0x18069559c (Missing)

#2. FIRAMonitorQueue
0  libswiftCoreData.dylib         0x1807a3e70 (Missing)
1  libswiftCoreData.dylib         0x180872070 (Missing)
2  libswiftCoreData.dylib         0x1802156dc (Missing)
3  libswiftCoreData.dylib         0x1802155cc (Missing)
4  libswiftCoreData.dylib         0x180220478 (Missing)
5  MyApp                          0x1006429f4 -[FIRAMonitor saveMonitoringDataToUserDefaultsOnMonitorQueue] + 4301924852
6  libswiftCoreData.dylib         0x1806629e0 (Missing)
7  libswiftCoreData.dylib         0x1806629a0 (Missing)
8  libswiftCoreData.dylib         0x180670ad4 (Missing)
9  libswiftCoreData.dylib         0x1806662cc (Missing)
10 libswiftCoreData.dylib         0x180672a50 (Missing)
11 libswiftCoreData.dylib         0x1806727d0 (Missing)
12 libswiftCoreData.dylib         0x18086b100 (Missing)
13 libswiftCoreData.dylib         0x18086acac (Missing)

#6. FIRAnalyticsQueue
0  MyApp                          0x100632000 -[FIRAMeasurement initWithOptions:] + 4301856768
1  MyApp                          0x100631310 __55+[FIRAMeasurement initializeSharedInstanceWithOptions:]_block_invoke + 4301853456
2  libswiftCoreData.dylib         0x1806629a0 (Missing)
3  libswiftCoreData.dylib         0x1806636cc (Missing)
4  MyApp                          0x10063127c +[FIRAMeasurement initializeSharedInstanceWithOptions:] + 4301853308
5  MyApp                          0x100648888 __47+[FIRAnalytics startWithConfiguration:options:]_block_invoke_2 + 4301949064
6  libswiftCoreData.dylib         0x1806629e0 (Missing)
7  libswiftCoreData.dylib         0x1806629a0 (Missing)
8  libswiftCoreData.dylib         0x180670ad4 (Missing)
9  libswiftCoreData.dylib         0x1806662cc (Missing)
10 libswiftCoreData.dylib         0x180672a50 (Missing)
11 libswiftCoreData.dylib         0x1806727d0 (Missing)
12 libswiftCoreData.dylib         0x18086b100 (Missing)
13 libswiftCoreData.dylib         0x18086acac (Missing)

Occurring in 4.1 also. Can't reproduce on demand, but hundreds of crashes reported in Crashlytics (still around 2-3% of daily sessions).

[paulb777]

Are there any patterns about the device types with the crashes? Are they low in available storage?

Mostly commonly used 6/6s/7(+) iPhones. iOS 10+. Generally low on memory (1-5%), but memory varies up to 50% free.

Sorry, disk space up to 50%.

[rsattar]

I'd love it if there was a way to reproduce this, but failing that, we can add some additional safety around this. What's strange is that we haven't seen this reported before (and this code has not changed in a very long time).

I'd definitely like to have a repro case, I'll see if I can manage to automate the startup sequence and trigger it :)
Version 3.x worked flawlessly. I don't think it's due to an interaction with other libs, Firebase is first in didFinishLaunching in my case anyway.
If it's of any help, I'm only using Analytics and Messaging. Never used swizzling and in 4.x opted out of direct messaging (using the old-school way).

Judging from this community version, could it be crashing in sqlite init part?
If I can help in any other way, name it :)

In the meantime, I'll have to revert to 3.x - do you think that may cause further issues?

[rsattar]

Thanks for the info. And it's also interesting that it works in 3.X but is crashy on 4.X. We haven't modified that code in a long time. I don't think you're negatively affected by reverting to 3.X, but obviously we'd like everyone to be on the latest version (much easier for us to provide support!).

[bcattle]

I'd also like to flag myself as getting this issue quite consistently. Maybe 8-9% DAUs? Let me know what I can do to help you guys track this down.

My observations:

1. iOS 10 only
2. Firebase v4.1.0
3. Disk: 2%-72% free
4. Recent iPhones only: 6, 6s, SE, 7

I'm still combing through the stack traces, let me know if there's more information I can provide.

After reverting to 3.x, crashes are indeed gone. I’ll make isolated examples of Firebase setups I’m using for both, but there’s nothing special really.

[bcattle]

We only started seeing this issue with the recent 4.1.1 release. @VladislavJevremovic did you need to revert all the way back to 3.x? Did you try 4.0.2?

Actually, I think 4.0.4 was the first 4.x I used. I noticed the issue then. Can’t vouch for anything before that.

[rsattar]

Hmm, this is getting worrisome. Another question: Are your apps Swift-only? What other SDKs are you guys using (wondering if there is some conflict with sqlite)