Crash on API 24+

I don’t have much to work with but consistently get this crash on APIs 24 and over. I’m using version 2.2.20 but was also getting the issue on 2.2.10 This crash started appearing after I did a big refactoring to move to a Viewmodel pattern. This entails that there are a lot more operations running in parallel whereas we used to load stuff linearly (and slowly…)

Thanks for any help.

10-09 11:24:10.989 E/mono-rt ( 1665): Stacktrace:
10-09 11:24:10.989 E/mono-rt ( 1665): 
10-09 11:24:10.989 E/mono-rt ( 1665):   at <unknown> <0xffffffff>
10-09 11:24:10.989 E/mono-rt ( 1665):   at (wrapper managed-to-native) Java.Interop.NativeMethods.java_interop_jnienv_call_nonvirtual_void_method_a (intptr,intptr&,intptr,intptr,intptr,Java.Interop.JniArgumentValue*) <0x00012>
10-09 11:24:10.989 E/mono-rt ( 1665):   at Java.Interop.JniEnvironment/InstanceMethods.CallNonvirtualVoidMethod (Java.Interop.JniObjectReference,Java.Interop.JniObjectReference,Java.Interop.JniMethodInfo,Java.Interop.JniArgumentValue*) [0x00074] in <e499a5498b1b48379b88fe5ed629079f>:0
10-09 11:24:10.989 E/mono-rt ( 1665):   at Java.Interop.JniPeerMembers/JniInstanceMethods.InvokeVirtualVoidMethod (string,Java.Interop.IJavaPeerable,Java.Interop.JniArgumentValue*) [0x0005f] in <e499a5498b1b48379b88fe5ed629079f>:0
10-09 11:24:10.989 E/mono-rt ( 1665):   at Android.Widget.ImageView.SetImageDrawable (Android.Graphics.Drawables.Drawable) [0x00038] in <2e14bb2dd93a405e81838369ed72695b>:0
10-09 11:24:10.989 E/mono-rt ( 1665):   at FFImageLoading.Views.ManagedImageView.SetImageDrawable (Android.Graphics.Drawables.Drawable) [0x00077] in C:\projects\ffimageloading\source\FFImageLoading.Droid\Views\ManagedImageView.cs:165
10-09 11:24:10.989 E/mono-rt ( 1665):   at FFImageLoading.Targets.ImageViewTarget.Set (FFImageLoading.Work.IImageLoaderTask,FFImageLoading.Drawables.SelfDisposingBitmapDrawable,bool) [0x00020] in C:\projects\ffimageloading\source\FFImageLoading.Droid\Targets\ImageViewTarget.cs:55
10-09 11:24:10.989 E/mono-rt ( 1665):   at FFImageLoading.PlatformImageLoaderTask`1/<>c__DisplayClass4_0<TImageView_REF>.<SetTargetAsync>b__0 () [0x0000b] in C:\projects\ffimageloading\source\FFImageLoading.Droid\Work\PlatformImageLoadingTask.cs:84
10-09 11:24:10.989 E/mono-rt ( 1665):   at FFImageLoading.Helpers.MainThreadDispatcher/<>c__DisplayClass5_0.<PostAsync>b__0 () [0x00008] in C:\projects\ffimageloading\source\FFImageLoading.Droid\Helpers\MainThreadDispatcher.cs:44
10-09 11:24:10.989 E/mono-rt ( 1665):   at Java.Lang.Thread/RunnableImplementor.Run () [0x0000e] in <2e14bb2dd93a405e81838369ed72695b>:0
10-09 11:24:10.989 E/mono-rt ( 1665):   at Java.Lang.IRunnableInvoker.n_Run (intptr,intptr) [0x00008] in <2e14bb2dd93a405e81838369ed72695b>:0
10-09 11:24:10.989 E/mono-rt ( 1665):   at (wrapper dynamic-method) object.8cfad20b-a362-4eda-8465-1706fdaaa79d (intptr,intptr) [0x00011] in <896ad1d315ca4ba7b117efb8dacaedcf>:0
10-09 11:24:10.990 E/mono-rt ( 1665):   at (wrapper native-to-managed) object.8cfad20b-a362-4eda-8465-1706fdaaa79d (intptr,intptr) [0x00021] in <896ad1d315ca4ba7b117efb8dacaedcf>:0
10-09 11:24:10.990 E/mono-rt ( 1665): /proc/self/maps:
10-09 11:24:10.990 E/mono-rt ( 1665): 12c00000-12e17000 rw-p 00000000 00:01 12296                              /dev/ashmem/dalvik-main space (deleted)
10-09 11:24:10.990 E/mono-rt ( 1665): 12e17000-1339e000 rw-p 00217000 00:01 12296                              /dev/ashmem/dalvik-main space (deleted)
10-09 11:24:10.990 E/mono-rt ( 1665): 1339e000-22c00000 ---p 0079e000 00:01 12296                              /dev/ashmem/dalvik-main space (deleted)
10-09 11:24:10.990 E/mono-rt ( 1665): 22c00000-22c01000 rw-p 00000000 00:01 12297                              /dev/ashmem/dalvik-main space 1 (deleted)
10-09 11:24:10.990 E/mono-rt ( 1665): 22c01000-32c00000 ---p 00001000 00:01 12297                              /dev/ashmem/dalvik-main space 1 (deleted)
10-09 11:24:10.990 E/mono-rt ( 1665): 582b7000-582bb000 r-xp 00000000 08:06 247                                /system/bin/app_process32
...

10-09 11:38:57.296 F/libc    ( 2002): Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 2002 (istribution_dev)

[fedemkr]

I’m using v2.2.25 and it’s still happenning. In my case, I have a ViewPager and in one of the pages I have a fragment with a MvxGridView. Each item has a FFImageLoading.Views.ImageViewAsync that is loaded in an adapter using

var image = view.FindViewById<ImageViewAsync>(Resource.Id.attachment_image);

var work = ImageService.Instance.LoadUrl(item.ImagePath)
              .LoadingPlaceholder("@drawable/no_attachment", FFImageLoading.Work.ImageSource.CompiledResource)
              .ErrorPlaceholder("@drawable/no_attachment", FFImageLoading.Work.ImageSource.CompiledResource)
              .DownSample(100, 100)
              .Into(image);

The crash occurs when images are loading at the first time (i.e. they are not catched yet) and I navigate from one of the pages to another view and then navigate back to the viewpager’s view.

I’ve workarounded this by creating a class to hold and cancel all the IScheduledWork:

public class ImageScheduledWorkHelper
{
    private List<IScheduledWork> imageScheduledWorks = new List<IScheduledWork>();

    private ImageScheduledWorkHelper()
    {
    }

    private static Lazy<ImageScheduledWorkHelper> _instance = new Lazy<ImageScheduledWorkHelper>(() => new ImageScheduledWorkHelper());
    public static ImageScheduledWorkHelper Instance => _instance.Value;

    public void Add(IScheduledWork work)
    {
        this.imageScheduledWorks.Add(work);
    }

    public void CancelAll()
    {
        foreach (var sw in this.imageScheduledWorks)
        {
            if (!sw.IsCompleted)
                sw.Cancel();
        }

        this.imageScheduledWorks.Clear();
    }
}

So after loading Into the image using the ImageService.Instance.LoadUrl I just add to the helper the IScheduledWork returned using ImageScheduledWorkHelper.Instance.Add(work); and then in the OnPause method of the ViewPager’s view I just call ImageScheduledWorkHelper.Instance.CancelAll(); to prevent the scheduled works to continue loading the images.

Hope it helps someone in the meantime.

[sylvain-toptal]

havent had time to try, sorry