Call System.getParam(). getAllParams() will crash when connected to the drone

[GanAHE]

1.description I'm trying to run the sample code on Android Studio, and it works fine on version 1.1.1. But it crashes when I try to upgrade to the latest version of 1.3.x. 

2. code private void runMavsdkServer() { MavsdkEventQueue.executor().execute(() -> { int mavsdkServerPort = mavsdkServer.run(); drone = new System(BACKEND_IP_ADDRESS, mavsdkServerPort);

  disposables.add(drone.getTelemetry().getFlightMode().distinctUntilChanged()
          .subscribe(flightMode -> logger.debug("flight mode: " + flightMode)));
  disposables.add(drone.getTelemetry().getArmed().distinctUntilChanged()
          .subscribe(armed -> logger.debug("armed: " + armed)));
  disposables.add(drone.getTelemetry().getPosition().subscribe(position -> {
    LatLng latLng = new LatLng(position.getLatitudeDeg(), position.getLongitudeDeg());
    viewModel.currentPositionLiveData.postValue(latLng);
  }));

  isMavsdkServerRunning = true;
  runOnUiThread(() -> buttonRunDestroyMavsdkServer.setText(R.string.destroy_mavsdk_server));

  //================================= Start ==================================
  drone.getParam().getAllParams().doOnSuccess(new Consumer<Param.AllParams>() {
    @Override
    public void accept(Param.AllParams allParams) throws Exception {
      Log.d("MavSDK", "accept: ");
    }
  }).doOnError(new Consumer<Throwable>() {
    @Override
    public void accept(Throwable throwable) throws Exception {

    }
  }).subscribe();

});

//================================= End ==================================

}

3. version （1）mavsdk:1.2.0 ， mavsdk-server:1.2.1 （2）mavsdk:1.3.0 ， mavsdk-server:1.3.0 I wanted to try the latest 1.3.2 release, but the IDE reported an error that the version of MavsdkServer class didn't match. I didn't know it was fixed or not in the latest version.

4. error info A/libc: Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x78 in tid 5909 (mavsdk-event-qu), pid 5581 (k.androidclient)

[JonasVautherin]

Hmm there is apparently a problem in the C++ build. I'll have a look ASAP, probably sometime next week.

Could it be a duplicate of https://github.com/mavlink/MAVSDK-Java/issues/131? But I would expect to see java.lang.UnsatisfiedLinkError as well... Can you show more of the stack trace?

[GanAHE]

Amazing work efficiency! Below is the complete console stack information. You can easily reproduce this problem in the MavSDK-Smaple code. I don't think it has anything to do with issue #131 。

================== stack ====================== I/Mavsdk: MAVSDK version: v1.4.10 D/MAVSDK-Server: Running mavsdk_server with connection url: udp://:14540 I/Mavsdk: Waiting to discover system on udp://:14540... I/Mavsdk: New system on: 192.168.0.104:54834 (with sysid: 1) D/Mavsdk: New: System ID: 1 Comp ID: 1 D/Mavsdk: Component Autopilot (1) added. W/Mavsdk: Vehicle type changed (new type: 2, old type: 0) D/Mavsdk: Discovered 1 component(s) I/Mavsdk: System discovered W/mavsdk-event-qu: type=1400 audit(0.0:6701807): avc: denied { read } for pid=14367 name="somaxconn" dev="proc" ino=177036984 scontext=u:r:untrusted_app:s0:c40,c259,c512,c768 tcontext=u:object_r:proc_net:s0 tclass=file permissive=0 I/Mavsdk: Server started I/Mavsdk: Server set to listen on 0.0.0.0:33171 D/MAVSDK-Server: mavsdk_server is now running, listening on port 33171 W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->putInt(Ljava/lang/Object;JI)V (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->objectFieldOffset(Ljava/lang/reflect/Field;)J (greylist,core-platform-api, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->putLong(Ljava/lang/Object;JJ)V (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed) W/k.androidclien: Accessing hidden method Llibcore/io/Memory;->peekLong(JZ)J (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Llibcore/io/Memory;->pokeLong(JJZ)V (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Llibcore/io/Memory;->pokeInt(JIZ)V (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Llibcore/io/Memory;->peekInt(JZ)I (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Llibcore/io/Memory;->pokeByte(JB)V (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Llibcore/io/Memory;->peekByte(J)B (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Llibcore/io/Memory;->pokeByteArray(J[BII)V (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Llibcore/io/Memory;->peekByteArray(J[BII)V (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->arrayBaseOffset(Ljava/lang/Class;)I (greylist,core-platform-api, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->arrayIndexScale(Ljava/lang/Class;)I (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->putInt(Ljava/lang/Object;JI)V (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, reflection, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->putLong(Ljava/lang/Object;JJ)V (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, reflection, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, reflection, allowed) W/k.androidclien: Accessing hidden field Ljava/nio/Buffer;->address:J (greylist, reflection, allowed) V/Telemetry: [mavsdk-event-queue] - Building channel to 127.0.0.1:33171 V/Param: [mavsdk-event-queue] - Building channel to 127.0.0.1:33171 W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed) W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed) D/MavSDK: accept: W/k.androidclien: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed) A/libc: Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x78 in tid 14485 (mavsdk-event-qu), pid 14367 (k.androidclient) E/RtgSchedManager: endActivityTransaction: margin state not match

[akirahrkw]

Hi, @GanAHE May I know if you have solved this issue, as I also recently got same crash and error.

version - mavsdk:1.3.1 , mavsdk-server:1.3.2

[GanAHE]

Hi, @GanAHE May I know if you have solved this issue, as I also recently got same crash and error.

version - mavsdk:1.3.1 , mavsdk-server:1.3.2

Hmm, not yet

[GanAHE]

Hey guys, the bug was fixed when I checked version 2.1.0. @JonasVautherin @akirahrkw