(Android) Emulator on Hyper-V

An apparently great news is that Microsoft has been cooking up an Android emulator. It appears that every company now feels compelled to create one. Right now we have Google’s emulator, Intel HAXM support for it, Genymotion, Xamarin Android emulator and now the Visual Studio’s one. It is getting crowded, isn’t it?

So, why I did write an apparently great news. Because the VS Android emulator, just like Windows Phone emulator, runs on top of Hyper-V. Which is not bad from the technical point of view but it is certainly not a good option on a developer machine. And that’s because turning on Hyper-V means that no other virtualization host can coexist. That’s right, forget about VMWare Workstation and Virtual Box when Hyper-V is turned on. Which makes sense on a server but on a developer machine it is sort of silly. The solution? According to Hyper-V crowd it is simple:

Just reboot with Hyper-V turned on or off, depending on your needs.

Which is … silly and really annoying. Heck, even Microsoft acknowledges this problem and it even lists it as one of the motivations beneath Visual Studio’s Emulator for Android:

Conflict with Hyper-V on Windows. Many emulators require you to disable Hyper-V or don’t work as well with Hyper-V as they do without. Using Hyper-V is part of the development setup for many developer activities, so asking you to restart your machine (multiple times a day) to toggle Hyper-V is not acceptable.

I agree that switching Hyper-V on and off is not acceptable. Bot nor is this solution. Instead of getting rid of (or modifying) Hyper-V when it comes to emulators, Microsoft decided to start creating all sort of emulators based on Hyper-V instead. Which is somehow conflicting with the awesome direction of open sourceness and multi platforms MS recently took. On the one hand they are going all nuts with open source and collaboration with other OS (amazing, btw) while on the other hand they are trying to monopolize virtualization on workstation machines. In the times when a mobile developer has to work with all sorts of different tools and software!

Other issues with the Hyper-V based emulator are that they require SLAT support (won’t run on older CPUs) and that they require Windows 8.x Pro or better. Both VMWare Workstation and Virtual Box run on “every” Windows you throw at them. Ah, and don’t forget that it will hardly support Google Play out of the box due to the Google’s silly restrictions (no emulator is allowed to ship Google Play except Google’s own).

So, the bottom line is, that yet another Android emulator is welcome, but it could be done much better. I’ll probably stick with Genymotion for the time being, since it works regardless of Hyper-V and is more feature packed that the rest.

Thinking about delayed getters on properties in C#6.0 or after that

Here is a typical scenario where one postpones property value creation until the property getter is accessed:

private SomeType something;

public SomeType Something 
{
   get
   {
     if (something == null)
     {
       something = new SomeType();
     }
     return something;
   }
}

This pattern is usually applied when property SomeType is rarely used. It doesn’t make much difference on desktop applications (unless there is a ton of these properties) but it might make some performance gains on mobile apps where performance is more critical and memory is less abundant. Of course, one could use Lazy<T> but that would create an instance of Layz<T> instead plus the instance of SomeType eventually.

Now, there is a Expression bodies on property-like function members proposition for C# 6.0 that allows getter-only properties to be implemented with an expression, i.e.:

public string Name => First + " " + Last;

However, full lambdas aren’t supported thus something field can’t be assigned and we’d end up with a new SomeType instance each time.

So, I was thinking a bit about how that could be implemented and here is my proposition for delayed getter-only property assignment:

public SomeType Something => const new SomeType();

This would cause the instance of SomeType to be created only when getter is first time accessed and after that the same instance would be used just like in the original example.

What do you think?

Finally upgraded to Windows 8.1 (from 8.0)

Since Microsoft released Windows 8.1 I’ve tried to upgrade my 8.0 to 8.1. Without success though. Every upgrade ended just a little bit before 100% with a BSOD and after some automatic retries to remedy the situation it simply rolled back to 8.0. By looking at the log file produced it was obvious there is a problem with a driver. But which one?

After some retries I gave up. Until now. The reason for my retry was that I found a dead computer (motherboard) after my vacation. I’ve replaced dead motherboard with a newer model (simply because the old one isn’t available anymore) and retried upgrading to 8.1 (thinking it might have been motherboard related). And I succeeded. The upgrade went through without problems. Hura. But.

After a while a realized that I didn’t plug in all my USB devices yet. So I started plugging them in only to create a BSOD after BSOD. By trial and error I’ve found that USB devices that act like disks are causing this problem (I have two of those). Then I went examining the crash dump. And there it was the real culprit in all its glory: iaStorF.sys aka Intel’s disk driver:

Debugging Details:
------------------


POOL_ADDRESS:  ffffe0000040f160 Nonpaged pool

FREED_POOL_TAG:  RstF

BUGCHECK_STR:  0xc2_7_RstF

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  WIN8_DRIVER_FAULT

PROCESS_NAME:  System

CURRENT_IRQL:  0

ANALYSIS_VERSION: 6.3.9600.16384 (debuggers(dbg).130821-1623) amd64fre

LAST_CONTROL_TRANSFER:  from fffff800ed2af338 to fffff800ed16a0a0

STACK_TEXT:  
ffffd000`20737018 fffff800`ed2af338 : 00000000`000000c2 00000000`00000007 00000000`00001205 00000000`04070015 : nt!KeBugCheckEx
ffffd000`20737020 fffff800`0105131e : 00000000`00000000 ffffe000`0c4ddb01 ffffe000`0b2f8010 ffffe000`01a05630 : nt!ExDeferredFreePool+0xbb8
ffffd000`207370f0 00000000`00000000 : ffffe000`0c4ddb01 ffffe000`0b2f8010 ffffe000`01a05630 ffffe000`0041a870 : iaStorF+0x131e


STACK_COMMAND:  kb

FOLLOWUP_IP: 
iaStorF+131e
fffff800`0105131e ??              ???

SYMBOL_STACK_INDEX:  2

SYMBOL_NAME:  iaStorF+131e

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: iaStorF

IMAGE_NAME:  iaStorF.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  4f7e1f6d

FAILURE_BUCKET_ID:  0xc2_7_RstF_iaStorF+131e

BUCKET_ID:  0xc2_7_RstF_iaStorF+131e

ANALYSIS_SOURCE:  KM

FAILURE_ID_HASH_STRING:  km:0xc2_7_rstf_iastorf+131e

FAILURE_ID_HASH:  {f7fa26b6-6e68-69b5-7668-84d625b41a69}

How does one fix that? Googling of course. Here is the solution from Hans-HermannKaas. It looks like Windows 8.1 changed something regarding drivers (see Herman’s explanation) and nor Intel nor Microsoft handle it when upgrading. Tough one to understand.

Basically you would want to copy iaStorF.sys from IRST driver’s package x64 folder into c:\windows\system32\drivers folder. For me – I had an outdated version there.

But because you can’t do that before upgrading you’ll have to detach all USB devices that act like disks, upgrade, fix this and only then reattach them.

There you go.

Different XAML layouts for different device orientations in Xamarin.Forms

In case you’ve been wondering how to achieve different XAML layouts for different device orientation with Xamarin.Forms (just Forms from now), here is a solution. The thing is that there is currently no support for this. There is support for different layout when it comes Phone vs Tablet (OnIdiom<T>) or when it comes to different OS (OnPlatform<T>) but the thing is that these guys are static. They do their work once and that’s it. They won’t react to changes and it makes sense, since underlying OS or device type don’t change during runtime.

So something different is need. But before I even start with the XAML there is an important part that has to be done – getting the current orientation, or better, rotation at the Portable Class Library level. It is a twofold solution.

Here is code that exists in PCL project and isn’t OS specific.

public enum Rotation
{
    Rotation0,
    Rotation90,
    Rotation180,
    Rotation270
}
public static class Orientation
{
    private static Rotation rotation;
    public static EventHandler RotationChanged;
    public static Rotation Rotation
    {
        get
        {
            return rotation;
        }
        set
        {
            if (Rotation != value)
            {
                rotation = value;
                OnRotationChanged();
            }
        }
    }

    public static bool IsLandscape
    {
        get
        {
            return Rotation == Rotation.Rotation90 
                || Rotation == Rotation.Rotation270;
        }
    }

    private static void OnRotationChanged()
    {
        if (RotationChanged != null)
            RotationChanged(null, EventArgs.Empty);
    }
}

And here is the OS specific part where you set the orientation.

Android version:

public class MainActivity : AndroidActivity
{
    protected override void OnCreate (Bundle bundle)
    {
        UpdateCurrentRotation();
        base.OnCreate (bundle);

        Xamarin.Forms.Forms.Init (this, bundle);

        SetPage (App.GetMainPage ());
    }

    public override void OnConfigurationChanged(Android.Content.Res.Configuration newConfig)
    {
        base.OnConfigurationChanged(newConfig);
        UpdateCurrentRotation();
    }

    private void UpdateCurrentRotation()
    {
        switch (WindowManager.DefaultDisplay.Rotation)
        {
            case  SurfaceOrientation.Rotation0:
                Orientation.Rotation = Rotation.Rotation0;
                break;
            case SurfaceOrientation.Rotation90:
                Orientation.Rotation = Rotation.Rotation90;
                break;
            case SurfaceOrientation.Rotation180:
                Orientation.Rotation = Rotation.Rotation180;
                break;
            case SurfaceOrientation.Rotation270:
                Orientation.Rotation = Rotation.Rotation270;
                break;
        }
    }
}

Windows Phone version (note that you have to set SupportedOrientations="PortraitOrLandscape" in your MainPage.xaml to enable rotation of the page):

public partial class MainPage : PhoneApplicationPage
{
    public MainPage()
    {
        InitializeComponent();
        UpdateRotation();
        Forms.Init();
        Content = App16.App.GetMainPage().ConvertPageToUIElement(this);
    }

    private void UpdateRotation()
    {
        if ((Orientation & PageOrientation.PortraitUp) 
== PageOrientation.PortraitUp) App16.Orientation.Rotation = Rotation.Rotation0; else if ((Orientation & PageOrientation.PortraitDown)
== PageOrientation.PortraitDown) App16.Orientation.Rotation = Rotation.Rotation180; else if ((Orientation & PageOrientation.LandscapeLeft)
== PageOrientation.LandscapeLeft) App16.Orientation.Rotation = Rotation.Rotation90; else App16.Orientation.Rotation = Rotation.Rotation270; } protected override void OnOrientationChanged
(OrientationChangedEventArgs e) { UpdateRotation(); base.OnOrientationChanged(e); } }

Sadly I have no iOS device at this time, but it should be pretty easy to support it as well.

At the beginning of the page/activity and each time orientation changes the current rotation is sent to Orientation class in PCL.

At this point we have the rotation information and event RotationChanges that notifies about changes in rotation. Now this information can be used to achieve the dynamic layout changes.

For that purpose I’ll use a Grid ContentView derived class that can be nicely used with XAML.

public class Rotational: ContentView
{
    public View Landscape { get; set; }
    public View Portrait { get; set; }
    public string LandscapeType { get; set; }
    public string PortraitType { get; set; }
    private bool isPortrait;

    protected override void OnParentSet()
    {
        base.OnParentSet();
        VisualElement view = ParentView;
        while (!(view is Page))
        {
            view = view.ParentView;
        }
        Page page = (Page)view;
        page.Disappearing += page_Disappearing;
        page.Appearing += page_Appearing;
    }

    void page_Appearing(object sender, EventArgs e)
    {
        Orientation.RotationChanged += CurrentOrientation_Changed;
        Update();
    }

    private void CurrentOrientation_Changed(object sender, EventArgs e)
    {
        Update(); 
    }

    void page_Disappearing(object sender, EventArgs e)
    {
        Orientation.RotationChanged -= CurrentOrientation_Changed;   
    }

    private void Update()
    {
        if (Content == null || Orientation.IsLandscape && isPortrait ||
            !Orientation.IsLandscape && !isPortrait)
        {
            Children.Clear();
            if (RhOrientation.IsLandscape)
{
isPortrait = false;
if (Landscape != null)
{
Content = Landscape;
}
else
{
View child = FindContentView(LandscapeType);
Content = child;
}
}
else
{
isPortrait = true;
if (Portrait != null)
{
Content = Portrait;
}
else
{
View child = FindContentView(PortraitType);
Content = child;
}
} } } private View FindContentView(string contentViewName) { var query = from t in GetType().GetTypeInfo().Assembly.DefinedTypes where t.IsClass && !t.IsAbstract && t.IsSubclassOf(typeof(ContentView)) && t.Name == contentViewName select t; var contentViewTypeInfo = query.SingleOrDefault(); if (contentViewTypeInfo != null) { ContentView page = (ContentView)Activator.CreateInstance
(contentViewTypeInfo.AsType()); return view; } else return null; } }

The class is named Rotational and defines four properties: Portrait, PortraitPage, Landscape and LandscapePage. Portrait and Landscape are of type View and you can store View derived classes that would appear based on orientation. Here is an example:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                       xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                       xmlns:v="clr-namespace:App16;assembly=App16"
                       x:Class="App16.TestPage">
  <v:Rotational>
    <v:Rotational.Landscape>
      <StackLayout Orientation="Vertical">
        <Label Text="Landscape" HorizontalOptions="Center" />
      </StackLayout>
    </v:Rotational.Landscape>
    <v:Rotational.Portrait>
      <StackLayout Orientation="Vertical">
        <Label Text="Portrait" HorizontalOptions="Center" />
      </StackLayout>
    </v:Rotational.Portrait>
  </v:Rotational>
</ContentPage>

Note that namespace declaration is required (xmlns:v="clr-namespace:App16;assembly=App16"). The above definition will show a label saying Portrait or Landscape, depending on device rotation and will change dynamically. The drawbacks of this approach are that both configurations are in-memory and the page might become a bit bloated.

Hence the second pair of properties: PortraitPage and LandscapePage. These are of string type and allow to enter the page class names the content of which will be used dynamically. Here is an example:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                       xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:v="clr-namespace:App16;assembly=App16"
                       x:Class="App16.TestPage">
  <v:Rotational PortraitType="PortraitTestContent" 
LandscapeType="LandscapeTestContent" /> </ContentPage>

Additional two pages are required (PortraitTestContent.xaml and LandscapeTestContent.xaml):

<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
                       xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                       x:Class="App16.PortraitTestPage">
    <Label Text="Portrait test" VerticalOptions="Center" 
HorizontalOptions="Center" /> </ContentView> ... <ContentView xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="App16.LandscapeTestPage"> <Label Text="Landscape Test" VerticalOptions="Center"
HorizontalOptions="Center" /> </ContentView>

The pages are found using reflection and based on their names (no namespace is used).

This method is more memory efficient since it loads required content on demand and discards it afterwards. On the other side it is slower due to the loading of the page.

So, here you have it. What do you think? Is there a better way?

The sample is attached.

Rotational.zip (77.2KB)

Update 1: Instead of dynamically loading ContentPage and then using its content, ContentView should be used (it is XAML supported). That'd be a change in FindPageElement method to FindContentView.
Update 2: Changed base type for Rotational from Grid to ContentView.

Note: sample hasn't been updated from original version.

An async problem

Imagine you have an asynchronous cancellable method like this:

CancellationTokenSource cts;

async Task DoSomethingAsync()
{
    if (cts != null)
        cts.Cancel();
    cts = new CancellationTokenSource();
    try
    {
        await AnAsyncMethodAsync(cts.Token);
    }
    finally
    {
        cts = null;
    }
}

And you trigger it here and there. The idea is that if it is already running when triggered (cts != null) it should send cancellation signal through its token.

Now, can you spot a possible problem that can occur?

The answer: DoSomething starts and is awaiting, another call is issued, original call is cancelled, second call is awaiting, original call advances to finally block (cts is set to null). Third call chimes in but this time cts is null (because original call set cts to null) even though second call is awaiting and thus second call is *not* cancelled, third call is awaiting and both second and third will finish.

There you go.

An alpha version of memory profiler for Xamarin Android

Memory profiling is one of the pillars of a good application. Even more important is on mobile devices since memory is usually scarce there. But sadly, there is no memory profiler for Xamarin Android development. Actually there is some raw support but lacks UI and friendliness. Hence I’ve built my own memory profiler.

This is an alpha quality version.

How it works

Since version 4.14 Xamarin has a (not) very visible support for memory profiling. But even with this support it isn’t easy to profile. With each garbage collection a log file is written on the device containing all the relevant data in a text format. Note that once you turn profiling on with

adb shell setprop debug.mono.profile log:heapshot

This setting is global and it works on all Xamarin apps on the device. Remember to turn it off afterwards if you don’t need it anymore to avoid, I guess, a huge performance hit.

There are two problems with the existing support here:

  • hard to trigger a garbage collection manually
  • hard to analyze data

My solution tackles both problems. The solution is divided into two parts.

Server side

The library available through NuGet does two things:

  • broadcasts its presence through UDP
  • allows triggering garbage collection from client

The library supports API Level 4 (Xamarin v1.6) and above.

Here is the NuGet package URL. You can also install it using this Package Manager Console command:

Install-Package RhMemProfiler.Server –Pre

The package is marked as prerelease and it won’t appear in NuGet Package manager if it isn’t set for Include Prerelease.

Once package has been added go ahead and create a global variable of type RhMemProfiler.Server.Beacon and initialize it with a friendly name and package name, like:

RhMemProfiler.Server.Beacon beacon;
….
beacon.Start("your friendly name", PackageName);

PackageName is the name of your package and it is ContextWrapper’s property.

Client side

This is a Windows application distributed through ClickOnce. After installation you’ll be prompted to open the firewall for the application. This is required since it, well, uses UDP and TCP to communicate with the server side.

profilerPrivate networks access is enough unless your mobile device is running on public network.

Once that is done you’ll be presented with a main window:

profiler

If your application on mobile device/emulator is running then you’ll see at least one option (one per IP on the device) in the combo box left of Connect button. That list contains friendly name (used when initializing on server) and its IP address. Pick any of them (IP doesn’t matter at this time). Hit Connect button.

If connection is successful you’ll see Conncted text in bottom left corner. If this is the first time you are connecting and/or memory profiling isn’t enabled yet on the device then you’ll be presented the Enable Profiling button, like:

enableprof

Enable profiling, restart mobile device application, disconnect, connect again and your are good to start memory profiling:

enableprof

Once there were at least two garbage collections and a snapshot has been taken afterwards you are able to compare them by selecting start and end version.

Collect Garbage … forces garbage collection on the mobile device
Snapshot … collects memory profiling log file from the device
Disable profiling … disables profiling on the device (profiling is per device, not per application – it affects all Xamarin apps on that device)
Only with source … shows only types from your package
Group panel … lets you group columns
Start and End … memory profile versions to compare to

Test

Imagine I have a class

public class MemLeak
{
    public string Value;
}

and a list of these somewhere defined. If I do a garbage collection before, when list is empty, and after one instance of MemLeak has been added I’ll see something like this when comparing before and after:

leak

It is pretty much obvious that the count of MemLeak instances increased by 1 and there are total of two instances of it around (actually I created one before that’s why there are two of them).

Memory profiling strategy

Memory profiling works by comparing state before and after. Usually a garbage collection is taken before some action and after that action. If the number of some instance increased without a valid reason it means that the application is leaking memory. Professional memory profilers help you even pinpointing the source of the leaks, however in our case, Xamarin doesn’t have that data available through this strategy.

Known limitations

  • ADB has to be in the path.
  • Only one device or emulator can be connected to the computer at the same time (the combo lets you pick the application but not the IP)

Final words

This is an alpha release, so be gentle with it and do not complain if your computer explodes because of it. It is something I wanted to release even at this stage for you to play with. It is actually pretty functional. So, feedback is appreciated and so are questions but I don’t guarantee anything, the development is done in my spare time (like that there is any Smile) for now. Hope you’ll find it useful.

Troubleshooting memory leaks in Xamarin.Android

I was testing an application I am building with Xamarin/Android. One of the tests was rotating the device while Google Maps fragment being shown. By default each time the orientation changes the activity and its views/fragments are recreated. IOW it is a good test for possible memory leaks because the recreation can be frequent.

I was quite surprised seeing a huge memory increase each time. Those eventually lead to an OutOfMemory in Java stack somewhere in Google Maps. After double checking that managed Xamarin code wasn’t leaking (i.e. retaining the said fragment somehow) anything I was starting to wonder whether Google Maps fragment is leaking internally. Perhaps only when combined with Xamarin. That’d be odd but not impossible.

Thus I started Android Studio and crafted a repro in pure Java. It wasn’t leaking. Thus it must have something to do with Xamarin. But what? Xamarin is providing a component to Google Maps (.net wrapping). Is it possible that there is a problem? Switching back to Xamarin and a few more tests later I couldn’t create a non leaking version. No matter what I did I still got leaks.

Suspecting a problem within Xamarin somewhere I decided to report a bug to bugzilla (Xamarin’s bug reporting web, not support) about it and mail a question to Xamarin support. The Jonathan Pryor’s response on bugzilla was lightning fast. In an hour or so he solved the mystery. The response from official support line was fast as well. (kudos to Xamarin on both).

It turns out that I was bitten with unmanaged memory pressure issue. Actually with unmanaged managed memory pressure issue. The thing is that Xamain/.net doesn’t know anything about unmanaged memory consumption. This is well known to .net developers, or at least, it should be. So, if you allocate a huge unmanaged piece of memory the .net won’t know about its size and won’t fire garbage collection automatically when it is released even it you are running low on memory (there are ways to let it know the memory consumption but that isn’t automatic). That’s usually valid for native code. But in the case of Xamarin, Java part is also unmanaged code to Xamarin (albeit Java is managed, but managed within Java with its own garbage collector).

Each time the Google Maps fragment was created and destroyed Xamarin created and “released” a single reference to maps fragment. By released I mean it was referenced from anywhere anymore and thus available for garbage collection by Xamarin garbage collector. But since .net saw only few bytes in that reference (which in turn referenced a ton of Java objects) it didn’t fire garbage collection automatically (and Java garbage collector couldn’t reclaim the memory because it was referenced by Xamarin) thus memory usage was increasing by huge steps. Strictly speaking this wasn’t a memory leak because all the memory would be reclaimed eventually - when garbage collection would run.

And that’s exactly how I solved it – I now run a manual garbage collection at least upon fragment creation (to reclaim the memory used by previous one). Problem solved. The bottom line is that you might run manual garbage collection after releasing a reference to Java object which internally uses plenty of memory. Also, calling Dispose on Xamarin objects helps (they might release reference to Java’s counterpart). In my case I couldn’t call Dispose because my fragment was created by layout inflation (actually I guess, I could by obtaining a reference to it, but that wasn’t obvious nor it might not help).

Here is more about Xamarin Garbage Collection.

Json.NET, Android/Xamarin and date serialization

In case you are using JSon.NET with Android/Xamarin you might encounter an “Object null reference” exception when trying to serialize (and probably deserialize as well) a type that contains DateTime property. The null object in question is TimeZoneInfo.Local.

This error happens when Android has no time zone set and thus Xamarin doesn’t set that property because it doesn’t know what time zone to use. There is a simple test where you can inspect Android’s time zone settings, just fire this command line:

adb shell getprop persist.sys.timezone

If it returns a blank line it means you are in trouble. A simple workaround for development is to set manually Android’s time zone through Settings/Date & Time or just fire another command line (i.e. setting time zone to Belgrade):

adb shell setprop persist.sys.timezone Europe/Belgrade

This works when using Genymotion emulator. Other than this there is no way to manually set the TimeZoneInfo.Local (perhaps it might be set through reflection, didn’t try it) which means your application won’t work in affected devices. Luckily the bug has been fixed and Xamarin will default to time zone defined by Java.Util.TimeZone.Default.ID. So, hopefully, the problem will go away for good.

A memory profiler for Xamarin.Android

Here is a first ever snapshot of my home-grown memory profiler for Xamarin.Android.

While very spartan it does the core job – comparing two snapshots for objects with growing instances (aka memory leaks). An array of Autofac.Core.IRegistrationSource[] is showing its references (one root, one to a List<>).

There you. Interested?

PS. Sample features DevExpress WPF components, chiefly XpfGrid.

Annoying problem that prevented comments on blog fixed. Hopefully.

Looks like I've finally fixed a problem that prevented you to comment on my/this blog. It was caused by blogengine.net's TypePadFilter extension that, when unconfigured, was throwing an uncaught exception that was propagated to the user that initiated comment save.
Here is my feedback on the issue. Hopefully the blogengine.net crew will make the posting comment less error prone by embedding all calls to extensions with a try/catch clause.
Anyway, fire comments away - good or bad. And please, let me know if there are still problems.