[Bug]: Crash when calling core.stop() on Android

[jstys]

Context

Liblinphone is being used as a gradle dependency to add SIP audio/video calling to an automation app. The goal is to only be utilizing Liblinphone resources when needed and to tear down when not in use.

General information

• Device: Asus Zenfone 9
• OS: Android 12.1
• Version of the App: N/A
• Version of the SDK: 5.2.109

Expected behaviour

After making a video or audio call, Liblinphone resources are torn down using core.stop() and the library is expected to be re-initialized if SIP resources are needed. The crash during core.stop() is preventing this and our only option currently is to leave the service running.

To Reproduce

1. Make a call using liblinphone (Doesn't need to connect, phone just needs to register to SIP server)
2. End call
3. Call core.stop() to cleanup resources
4. Observe repeatable crash on Android

Additional context

Below is a stacktrace of the crash. The issue of CoreManager not being instantiated is outside of our control as far as I can tell because a valid instance exists just prior to calling core.stop(). It seems like there's still a race condition between CoreManager.onLinphoneCoreStop() and CoreManager.destroy().

2023-10-05 08:03:09.517  9620-9620  AndroidRuntime          net.test.myapp                     E  FATAL EXCEPTION: main
                                                                                                    Process: net.test.myapp, PID: 9620
                                                                                                    java.lang.RuntimeException: Unable to stop service org.linphone.core.tools.service.CoreService@562ccee: java.lang.RuntimeException: CoreManager not instantiated yet
                                                                                                    	at android.app.ActivityThread.handleStopService(ActivityThread.java:4846)
                                                                                                    	at android.app.ActivityThread.access$2100(ActivityThread.java:266)
                                                                                                    	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2203)
                                                                                                    	at android.os.Handler.dispatchMessage(Handler.java:106)
                                                                                                    	at android.os.Looper.loopOnce(Looper.java:241)
                                                                                                    	at android.os.Looper.loop(Looper.java:358)
                                                                                                    	at android.app.ActivityThread.main(ActivityThread.java:8068)
                                                                                                    	at java.lang.reflect.Method.invoke(Native Method)
                                                                                                    	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
                                                                                                    	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1009)
                                                                                                    Caused by: java.lang.RuntimeException: CoreManager not instantiated yet
                                                                                                    	at org.linphone.core.tools.service.CoreManager.instance(CoreManager.java:78)
                                                                                                    	at org.linphone.core.tools.service.CoreService.onDestroy(CoreService.java:157)
                                                                                                    	at android.app.ActivityThread.handleStopService(ActivityThread.java:4826)
                                                                                                    	at android.app.ActivityThread.access$2100(ActivityThread.java:266) 
                                                                                                    	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2203) 
                                                                                                    	at android.os.Handler.dispatchMessage(Handler.java:106) 
                                                                                                    	at android.os.Looper.loopOnce(Looper.java:241) 
                                                                                                    	at android.os.Looper.loop(Looper.java:358) 
                                                                                                    	at android.app.ActivityThread.main(ActivityThread.java:8068) 
                                                                                                    	at java.lang.reflect.Method.invoke(Native Method) 
                                                                                                    	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) 
                                                                                                    	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1009) 

SDK logs URL

No response