[Mono-dev] ExecutionEngineException: Couldn't create thread

[Robert Jordan]

Hey,

This bug is already tracked in Bugzilla:

http://bugzilla.ximian.com/show_bug.cgi?id=78241

It's almost fixed, at least it works for me.

Robert


Brian Crowell wrote:
> I've got the following sequence staring at me:
> 
> ====================
> 
> ** (/opt/ProgramName.Withheld.exe:2670): WARNING **: CreateThread: error 
> creating thread handle
> 
> Unhandled Exception: System.ExecutionEngineException: Couldn't create thread
> in <0x00000> <unknown method>
> in (wrapper delegate-begin-invoke) System.MulticastDelegate:begin_invoke_IAsyncR
> esult_object_AsyncCallback_object (object,System.AsyncCallback,object)
> in <0x00015> System.Threading.ThreadPool:QueueUserWorkItem (System.Threading.Wai
> tCallback callback, System.Object state)
> in <0x00006> System.Timers.StartTimer ()
> in (wrapper delegate-invoke) System.MulticastDelegate:invoke_void ()
> 
> ** (/opt/ProgramName.Withheld.exe:2670): WARNING **: _wapi_handle_unref: 
> Attempting to unref unused handle 0x20b3a8
> 
> ** (/opt/ProgramName.Withheld.exe:2670): WARNING **: _wapi_handle_unref: 
> Attempting to unref unused handle 0x20b2d0
> 
> ** (/opt/ProgramName.Withheld.exe:2670): WARNING **: _wapi_handle_unref: 
> Attempting to unref unused handle 0x20b120
> 
> ** (/opt/ProgramName.Withheld.exe:2670): WARNING **: _wapi_handle_unref: 
> Attempting to unref unused handle 0x20b1f8
> 
> ====================
> 
> ...and there the program has hung.
> 
> I'm going to attempt to reproduce the error with a test case, but in the 
> meantime, here's the highlights:
> 
> ====================
> class MainClass {
>      public static int Main( string[] args ) {
>          // Check args, return one if there's a problem
> 
>         _timer = new System.Timers.Timer( 10.0 );
>         _timer.BeginInit();
>         _timer.AutoReset = false;
>         _timer.Elapsed += new System.Timers.ElapsedEventHandler( 
> HandleTimerElapsed );
>         _timer.EndInit();
>         _timer.Start();
> 
> 	// Do not allow the program to end
> 	Thread.CurrentThread.Suspend();
> 
> 	return 0;
>      }
> 
>      private static void HandleTimerElapsed( object sender, 
> System.Timers.ElapsedEventArgs e ) {
>          try {
>              // Set the interval to something substantially higher
>              // (on the order of several minutes)
>              _timer.Interval = someLongerInterval;
>              _timer.Start();
> 
>              DoSomethingThatMayOrMayNotBeLongerThanTheInterval();
>          }
>          catch( ThreadAbortException ) {
>              throw;
>          }
>          catch( Exception ex ) {
>              // Default: check every minute if there's an error
>              _timer.Interval = 60000.0;
>              _timer.Start();
> 
>              Console.Error.WriteLine( ex );
>          }
>      }
> }
> ====================
> 
> In the instance that produced the above error, 
> DoSomethingThatMayOrMayNotBeLongerThanTheInterval() was always shorter than the 
> interval. (unless, I suppose, something in that call hung, but then the 
> thread-pool should just be starved, and shouldn't throw a wrench)
> 
> Other possible sources of threads:
> 
> * The program uses remoting heavily
> * The program does a lot of work in a separate AppDomain (but does not 
> explicitly create threads, nor uses asynchronous invokes or the thread pool)
> * The program often calls System.Diagnostics.Process.Start() followed by 
> process.WaitForExit()
> 
> Also, while the program has changed slightly since I last ran it on 1.1.13.4, 
> that version did not exhibit this behavior. I am running it on my domain-patched 
> 1.1.13.8 (which funnels all cross-domain calls through the CrossAppDomainChannel).
> 
> --Brian