REALM_JNI: flock() failed: Bad file descriptor in io_realm_internal_OsSharedRealm.cpp

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      We have been struggling with more or less random errors for some time now. Lately I've experienced this one during developement:

      04-18 12:51:32.263 E/REALM_JNI: jni: ThrowingException 5, flock() failed: Bad file descriptor in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 126, .
    Exception has been thrown: Unrecoverable error. flock() failed: Bad file descriptor in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 126
04-18 12:51:32.270 E/AndroidRuntime: FATAL EXCEPTION: SyncAdapterThread-3
    Process: com.example.app, PID: 12352
    io.realm.exceptions.RealmError: Unrecoverable error. flock() failed: Bad file descriptor in /Users/cm/Realm/realm-java/realm/realm-library/src/main/cpp/io_realm_internal_OsSharedRealm.cpp line 126
        at io.realm.internal.OsSharedRealm.nativeBeginTransaction(Native Method)
        at io.realm.internal.OsSharedRealm.beginTransaction(OsSharedRealm.java:269)
        at io.realm.BaseRealm.beginTransaction(BaseRealm.java:401)
        at io.realm.Realm.beginTransaction(Realm.java:146)
        at io.realm.Realm.executeTransaction(Realm.java:1403)
        at com.example.app.sync.SyncAdapter.syncCars(SyncAdapter.kt:1266)
        at com.example.app.sync.SyncAdapter.syncComplete(SyncAdapter.kt:140)
        at com.example.app.sync.SyncAdapter.onPerformSync(SyncAdapter.kt:101)
        at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:321)

      > Note: The sync adapter framework runs onPerformSync() on a background thread, so you don't have to set up your own background processing.

      The code of the SyncAdapter wasn't changed for quite a while. At the specific line, there is just an {{realm.executeTransaction

      { ... }

      }}.

      Can you guys read anything from the stack trace? What's causing this crash?

      Version of Realm and tooling

      Realm version(s): 5.0.0

      Realm sync feature enabled: no

      Android Studio version: 3.1.1

      Which Android version and device: Pixel 2 (Android 8.1.0)

            Assignee:
            Unassigned
            Reporter:
            Unito Sync Bot
            Archiver:
            Marc Greenfield

              Created:
              Updated:
              Resolved:
              Archived: