Bug 12342 - NullReferenceException in IAsyncResult.AsyncWaitHandle.WaitOne
Summary: NullReferenceException in IAsyncResult.AsyncWaitHandle.WaitOne
Status: RESOLVED FIXED
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: 2.10.x
Hardware: PC Linux
: --- normal
Target Milestone: Untriaged
Assignee: Marek Safar
URL:
Depends on:
Blocks:
 
Reported: 2013-05-22 09:11 UTC by Rebex.NET
Modified: 2013-05-23 05:12 UTC (History)
3 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED FIXED

Description Rebex.NET 2013-05-22 09:11:18 UTC
Hello, there is a bug in Mono - if you try to run this code:

var task = new System.Threading.Tasks.TaskFactory().StartNew(() => { });
    var ar = (System.Threading.IAsyncResult)task;
    ar.AsyncWaitHandle.WaitOne();

it gives the following exception:

Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object
  at ReproMissingAsyncWaitHandler.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0
[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
  at ReproMissingAsyncWaitHandler.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0
Comment 1 Marek Safar 2013-05-23 05:12:29 UTC
Fixed in master