Failed lock verification

Question

I've been getting this error every time my app starts and someone told me that it has something to do with synchronized in java. However, I'm am not using that directly (though pretty much every library in my app does). I don't know where to start and what code I should be posting. Any ideas?

Here you can see some of my logs with a bunch of different libraries complaining:

08-06 20:04:52.287 14696-14696/com.supercilex.robotscouter.debug I/art: Late-enabling -Xcheck:jni
08-06 20:04:52.323 14696-14705/com.supercilex.robotscouter.debug E/art: Failed sending reply to debugger: Broken pipe
08-06 20:04:52.323 14696-14705/com.supercilex.robotscouter.debug I/art: Debugger is no longer active
08-06 20:04:52.323 14696-14705/com.supercilex.robotscouter.debug I/art: Starting a blocking GC Instrumentation
08-06 20:04:52.386 14696-14696/com.supercilex.robotscouter.debug W/System: ClassLoader referenced unknown path: /data/app/com.supercilex.robotscouter.debug-2/lib/arm64
08-06 20:04:55.309 14696-14696/com.supercilex.robotscouter.debug W/System: ClassLoader referenced unknown path: /data/app/com.supercilex.robotscouter.debug-2/lib/arm64
08-06 20:04:55.372 14696-14696/com.supercilex.robotscouter.debug W/art: Class com.google.firebase.FirebaseApp failed lock verification and will run slower.
08-06 20:04:55.372 14696-14696/com.supercilex.robotscouter.debug W/art: Common causes for lock verification issues are non-optimized dex code
08-06 20:04:55.372 14696-14696/com.supercilex.robotscouter.debug W/art: and incorrect proguard optimizations.
08-06 20:04:55.381 14696-14696/com.supercilex.robotscouter.debug W/art: Class android.support.v4.util.SimpleArrayMap failed lock verification and will run slower.
08-06 20:04:55.454 14696-14696/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.api.GoogleApiClient failed lock verification and will run slower.
08-06 20:04:55.474 14696-14696/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.internal.zzqc failed lock verification and will run slower.
08-06 20:04:55.507 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.internal.zzqc$zzc failed lock verification and will run slower.
08-06 20:04:55.519 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.api.GoogleApiClient$Builder failed lock verification and will run slower.
08-06 20:04:55.533 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.internal.zzd failed lock verification and will run slower.
08-06 20:04:55.540 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.internal.zzm failed lock verification and will run slower.
08-06 20:04:55.542 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.internal.zzn failed lock verification and will run slower.
08-06 20:04:55.548 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.stats.zzb failed lock verification and will run slower.
08-06 20:04:55.557 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.internal.zzsb failed lock verification and will run slower.
08-06 20:04:55.558 14696-14965/com.supercilex.robotscouter.debug W/DynamiteModule: Local module descriptor class for com.google.firebase.auth not found.
08-06 20:04:55.561 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.internal.zzz failed lock verification and will run slower.
08-06 20:04:55.566 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.zzf failed lock verification and will run slower.
08-06 20:04:55.567 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.zzd$zzc failed lock verification and will run slower.
08-06 20:04:55.571 14696-14965/com.supercilex.robotscouter.debug W/art: Class com.google.android.gms.common.internal.zzd$zzh failed lock verification and will run slower.

Answer 1

It happens to me on a Nexus 6P and Android 7.0 final release. There is an opened bug for this issue: https://code.google.com/p/android/issues/detail?id=219490