Using Zope 2.7 under Plone 2.0.2 on Solaris

One of our developers noticed a problem with Zope leak – see below -  has anyone else noticed this?
Is this patched with newest version Zope 2.7.2
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I noticed that since zope 2.7.x (which is different from 2.6 architecture). It is always got crushed without notification.  For example, when I click a folder, in the folder, if I click the head to sort the files by date. A "core" file will be created in the zope server's bin directory and the zope server is crushed.  Is this a bug in 2.7.x?  Do you know that is anyway that I can read this "core" file (it is in binary format).
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Thanks
-Bill