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

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)

[cmelchior]

Hi @MariusBoepple Thank you very much for this. I’ll run this past our Core people in order to determine if this can happen in other scenarios than accidentially deleting the Realm file

[sync-by-unito[bot]]

➤ Brian Munkholm commented:

Closing as outdated.