I just tried to hang 1.1.1 (using a traditional linux vm) and a 1.4 image with a Cog vm (also linux). No problems, but I do have questions that might be important to others trying to reproduce it:

(1) how fast do you do this?
(2) do you inspect the instances, or just let them get gc'd immediately?

Bill

From: pharo-project-bounces@lists.gforge.inria.fr [pharo-project-bounces@lists.gforge.inria.fr] on behalf of Larry White [ljw1001@gmail.com]
Sent: Thursday, December 01, 2011 12:56 PM
To: Pharo-project@lists.gforge.inria.fr
Subject: Re: [Pharo-project] VM freezes sending #basicNew to Stream subclass

I can do it with

Stream basicNew.

but I have to invoke it twice. The first time it works ok.

On Thu, Dec 1, 2011 at 12:48 PM, St�phane Ducasse <stephane.ducasse@inria.fr> wrote:

gary

can you post the smallest code that makes the system hangs?

Stef

On Dec 1, 2011, at 4:48 PM, Larry White wrote:

> Hi,
>
> Throwing this out there because it may be a bug.
>
> I'm running the Seaside one-click install on OS X Lion.
> Pharo1.3
> Latest update: #13302
>
> I can reliably cause my VM to freeze up and need to Force-Quit it from the OS.
>
> I'm implementing (copying) the probability logic from the blue book. When I tried to create an instance of the Binomial class, the system hung. I can replicate the problem by sending the message #basicNew to ProbabilityDistribution. ProbabilityDistribution is a direct subclass of Stream and I haven't overridden or modified #basicNew.
>
> What's happening is that it fails in the BlockClosure [anObject doit], but only when I instantiate a member of this particular class hierarchy. In the probability classes, a #doIt in a Workspace hits the line "self suspend" in the #terminate method of Process and the VM hangs there.
>
> I believe they had ProbabilityDistribution subclass from Stream because sampling from a distribution is like reading from a Stream, but I don't think any there's any actual shared code, so I switched the superclass of ProbabilityDistribution to Object and the code works fine now.
>
> Thanks.
>
> Larry