IssueTracker

Any updates on this? It's been a month already since I reported it, and it seems this crash is occurring quite frequently for my users.

I am still regularly receiving reports about this issue, and it seems it has not been addressed in the latest 1.4.0-rc01 release.

Seems like a fairly easy fix on our end. I'll see to that it is fixed in 1.5.

As the issue cannot be reproduced locally, it is difficult to obtain a bug report. However, can we analyze the available stack trace to identify any potential issues?

Any update on this issue?

Actually this issue reports the problem at two different points. Stack-traces for both instances are being shared.

The first one occurs when an application attempts to send a notification by calling the NotificationManager.notify method on the Android NotificationManager (). The second occurs when an app attempts to use the MediaControllerCompat.getMetadata() function to obtain information from a media session controller. Both fall on the same binder transaction, which appears to be the primary cause of such an ANR.

Note: It should be noted that the ANR related to retrieving metadata occurs only with the MediaControllerImplApi21 class, and not with the other two classes, MediaControllerImplApi29 and MediaControllerImplBase. Which is mentioned in Android Media Framework class - MediaControllerCompat.java.

Query: Could this be a device-specific problem? It appears that the majority of devices employing the Mali/MediaTek chipset are affected. I recall that this chipset has had issues with its HardwareRenderer.nSyncAndDrawFrame function. Could this be relevant?

~/android/support/v4/media/session/MediaControllerCompat.java

public MediaControllerCompat(Context context, @NonNull MediaSessionCompat.Token sessionToken) {
        if (sessionToken == null) {
            throw new IllegalArgumentException("sessionToken must not be null");
        }
        mRegisteredCallbacks = Collections.synchronizedSet(new HashSet<>());
        mToken = sessionToken;

        if (Build.VERSION.SDK_INT >= 29) {
            mImpl = new MediaControllerImplApi29(context, sessionToken);
        } else if (Build.VERSION.SDK_INT >= 21) {
            mImpl = new MediaControllerImplApi21(context, sessionToken);
        } else {
            mImpl = new MediaControllerImplBase(sessionToken);
        }
    }

ANR Stack-traces:

NotificationManager.notify()

main (native):tid=1 systid=12813 
#00 pc 0x86f8c libc.so (syscall + 28)
#01 pc 0x1b089c libart.so (art::ConditionVariable::WaitHoldingLocks(art::Thread*) + 148)
#02 pc 0x674698 libart.so (art::GoToRunnable(art::Thread*) + 480)
#03 pc 0x674474 libart.so (art::JniMethodEnd(unsigned int, art::Thread*) + 28)
       at android.os.BinderProxy.transactNative(BinderProxy.java)
       at android.os.BinderProxy.transact(BinderProxy.java:565)
       at android.app.INotificationManager$Stub$Proxy.enqueueNotificationWithTag(INotificationManager.java:3355)
       at android.app.NotificationManager.notifyAsUser(NotificationManager.java:610)
       at android.app.NotificationManager.notify(NotificationManager.java:560)
       at androidx.core.app.NotificationManagerCompat.notify(NotificationManagerCompat.java:227)
       at androidx.core.app.NotificationManagerCompat.notify(NotificationManagerCompat.java:208)
       at com.audiomack.playback.MusicService$MediaControllerCallback.updateNotification(MusicService.kt:934)
       at com.audiomack.playback.MusicService$MediaControllerCallback.onPlaybackStateChanged(MusicService.kt:907)
       at android.support.v4.media.session.MediaControllerCompat$Callback$MessageHandler.handleMessage(MediaControllerCompat.java:1088)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loop(Looper.java:257)
       at android.app.ActivityThread.main(ActivityThread.java:8192)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:626)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1015)

MediaControllerCompat.getMetadata()

main (native):tid=1 systid=1646 
#00 pc 0x5ddec libc.so (syscall + 28)
#01 pc 0x130dc9 libart.so (art::ConditionVariable::WaitHoldingLocks(art::Thread*) + 88)
#02 pc 0x4d8c83 libart.so (art::GoToRunnable(art::Thread*) + 342)
#03 pc 0x4d8b05 libart.so (art::JniMethodEnd(unsigned int, art::Thread*) + 8)
       at android.os.BinderProxy.transactNative(BinderProxy.java)
       at android.os.BinderProxy.transact(BinderProxy.java:540)
       at android.media.session.ISessionController$Stub$Proxy.getMetadata(ISessionController.java:1589)
       at android.media.session.MediaController.getMetadata(MediaController.java:162)
       at android.support.v4.media.session.MediaControllerCompat$MediaControllerImplApi21.getMetadata(MediaControllerCompat.java:2111)
       at android.support.v4.media.session.MediaControllerCompat.getMetadata(MediaControllerCompat.java:301)
       at com.audiomack.playback.MusicService$MediaControllerCallback.updateNotification(MusicService.kt:702)
       at com.audiomack.playback.MusicService$MediaControllerCallback.onPlaybackStateChanged(MusicService.kt:695)
       at android.support.v4.media.session.MediaControllerCompat$Callback$MessageHandler.handleMessage(MediaControllerCompat.java:1088)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loop(Looper.java:223)
       at android.app.ActivityThread.main(ActivityThread.java:7740)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:612)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:997)

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