Explicit concurrent copying GC freed 7041(512KB) AllocSpace objects error

Wyllis Monteiro 21 Reputation points
2022-02-06T20:47:41.203+00:00

I'm using Xamarin Forms framework for android and iOS mobile platform, on iOS devices it work's well but in Android when going on a specific page app shut down.

I got this error : Explicit concurrent copying GC freed 7041(512KB) AllocSpace objects

Using breakpoint I noticed crash arrived executing this

var content = JsonConvert.SerializeObject(
                            newStorageUsers,
                            Formatting.None,
                            new JsonSerializerSettings()
                            {
                                ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                            });

I show you entire demo code

Page in which I got error

private readonly IStorageUserService _storageService
public MyPage(User user)
{
   InitializeComponent();
   ...
   _storageService = new StorageUserServiceImpl();
   _storageService.StoreUser(user);
   ...
}

Service Interface

public interface IStorageUserService
{
    void StoreUser(User user);
}

Service Implementation

public class StorageUserServiceImpl : IStorageUserService
{
    private string _usersPathFile = Path.Combine(App.GetPackagePath(), "users.txt");
    public StorageUserServiceImpl()
    {
        if (!File.Exists(_usersPathFile))
        {
            _createUsersFile();
        }
    }

    private void _createUsersFile()
    {
        var file = File.Create(_usersPathFile);
        file.Close();
    }

    public void StoreUser(User user)
    {
        var currentStorage = GetStorageUsers();
        List<StorageUser> newStorageUsers = new List<StorageUser>() { };
        if (currentStorage != "" && currentStorage != "[]")
        {
            newStorageUsers = JsonConvert.DeserializeObject<List<StorageUser>>(currentStorage);
        }
        var storageUser = new StorageUser()
        {
            Infos = user,
            CreationDate = Helper.DateFormatter.NowDateTime()
            ...
        };
        newStorageUsers.Add(storageUser);

        var content = JsonConvert.SerializeObject(
                            newStorageUsers,
                            Formatting.None,
                            new JsonSerializerSettings()
                            {
                                ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                            });

        _store(newStorageUsers, content);
    }

    private void _store(List<StorageUser> newStorageUser, string content)
    {
        // breakpoint can't be triggered there because app shut down with logs
        File.WriteAllText(_usersPathFile, content);
    }
 }

public void StoreUser(User user)
{
    var currentStorage = GetStorageUsers();
    List<StorageUser> newStorageUsers = new List<StorageUser>() { };
    if (currentStorage != "" && currentStorage != "[]")
    {
        newStorageUsers = JsonConvert.DeserializeObject<List<StorageUser>>(currentStorage);
    }
    var storageUser = new StorageUser()
    {
        Infos = user,
        CreationDate = Helper.DateFormatter.NowDateTime()
        ...
    };
    newStorageUsers.Add(storageUser);

    var content = JsonConvert.SerializeObject(
                        newStorageUsers,
                        Formatting.None,
                        new JsonSerializerSettings()
                        {
                            ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                        });

    _store(newStorageUsers, content);
}

private void _store(List<StorageUser> newStorageUser, string content)
{
    // breakpoint can't be triggered there because app shut down with logs
    File.WriteAllText(_usersPathFile, content);
}

}

This service is used on several pages but I got this bug in only one page

After this message on logs :

Explicit concurrent copying GC freed 7041(512KB) AllocSpace objects, 2(264KB) LOS objects, 49% free, 4343KB/8687KB, paused 187us total 28.412ms

I got

Pending exception java.lang.StackOverflowError: stack size 8192KB ...

JNI DETECTED ERROR IN APPLICATION: JNI IsInstanceOf called with pending exception java.lang.StackOverflowError: stack size 8192KB ...

Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 8815 (om.myapp.app), pid 8815

've no more details of what happened and why, how can I fix this please?

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A Microsoft open-source app platform for building Android and iOS apps with .NET and C#.
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