SQLiteCantOpenDatabaseException => unknown error (code 14): Could not open database (Android 6.0)

Following is working on many thousands of devices but recently I got following errors, twice, both from android 6.0, so it may be related to the new android version:

RootUtils.copyDatabase(path, pathApp);
if (new File(pathApp).exists())
{
    L.d(this, "Database copied!"); // <= this is called, so copying file succeeds!!!

    SQLiteDatabase db = SQLiteDatabase.openDatabase(pathApp, null, SQLiteDatabase.OPEN_READONLY);
    final Cursor cursor = db.rawQuery("select * from contacts", new String[0]); // <= this line throws the exception
    cursor.moveToFirst();
    ....
}

Log/Exception

c.m.s.utils.RootUtils   [RootUtils-91]  copyDatabase: true
c.m.s.networks.utils.Util   [FUtil-105] Database copied!
c.m.s.networks.utils.Util   [FUtil-185] unknown error (code 14): Could not open database
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
    at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
    at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:207)
    at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:191)
    at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
    at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
    at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
    at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:806)
    at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:791)
    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
    at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
    ...

My copy function is following:

public final static boolean copyDatabase(String pathSource, String pathTarget) throws IOException, InterruptedException, TimeoutException, RootDeniedException
{
    Shell shell = RootTools.getShell(true);
    Command command = new Command(0,
            "su\n",
            "rm " + pathTarget + "\n",
            "cat " + pathSource + " > " + pathTarget + "\n",
            "chown root.root " + pathTarget + "\n",
            "chmod 777 " + pathTarget + "\n");
    command = shell.add(command);
    int exitCode = command.getExitCode();
    while (!command.isFinished()) {
        Thread.sleep(50);
    }
    shell.close();
    boolean success = exitCode == -1 && command.isFinished();
    L.d(RootUtils.class, "copyDatabase: " + success);
    return success;
}