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POSubject<T> stops publishing items
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  1. POSubject<T> stops publishing items
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    copied!<p>I have a <code>Subject&lt;T&gt;</code> that I'm publishing items into via <code>OnNext</code> and after a while, under load, I get this exception:</p> <pre><code>System.NullReferenceException: Object reference not set to an instance of an object at System.Diagnostics.ExceptionExtensions.PrepareForRethrow (System.Exception exception) [0x00000] in &lt;filename unknown&gt;:0 at System.Concurrency.AsyncLock.Wait (System.Action action) [0x00000] in &lt;filename unknown&gt;:0 at System.Concurrency.Scheduler+&lt;&gt;c__DisplayClass4.&lt;Schedule&gt;b__0 () [0x00000] in &lt;filename unknown&gt;:0 at System.Concurrency.ImmediateScheduler.Schedule (System.Action action) [0x00000] in &lt;filename unknown&gt;:0 at System.Concurrency.Scheduler.Schedule (IScheduler scheduler, System.Action`1 action) [0x00000] in &lt;filename unknown&gt;:0 at System.ScheduledObserver`1[GetNotifyd.Superfeedr.FeedItem].EnsureActive () [0x00000] in &lt;filename unknown&gt;:0 at System.Collections.Generic.Subject`1[GetNotifyd.Superfeedr.FeedItem].OnNext (GetNotifyd.Superfeedr.FeedItem value) [0x00000] in &lt;filename unknown&gt;:0 </code></pre> <p>After this happens I can still publish items via <code>OnNext</code>, but my subscriber no longer receives anything. This is running under mono 2.10.1 using the .NET 3.5 Reactive Extensions DLLs from MS (i.e. i don't think it's mono code that's dying). I haven't seen this happen when I try it on windows, but i haven't run the same loads there. The item that is the argument to OnNext is definitely not null, so that's not the cause.</p> <p>Any idea what might be causing this or how i could recover the Subject, or do i just have to create a new Subject, notify all my subscribers to subscribe to that instead?</p> <p>Since it looks like an Rx issue, i've also reported it on <a href="http://social.msdn.microsoft.com/Forums/en/rx/thread/5d6de85a-5860-4407-adfd-a1ab4dcc8f0a" rel="nofollow">their forum</a></p> <p><strong>Update:</strong> The <a href="http://social.msdn.microsoft.com/Forums/en/rx/thread/5d6de85a-5860-4407-adfd-a1ab4dcc8f0a" rel="nofollow">issue was confirmed</a> as a Rx/mono issue for the combinations of versions i was using. Upgrading to latest Rx (1.0.10605) fixed the problem.</p>
 

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