From: Tobias Peters <t-peters@...>
Date: 2003-01-09T08:00:30+09:00
Subject: Re: unknown data type 0x28

Idan Sofer wrote:
> I would like to ask, what is usually the cause of this error:
> [BUG] rb_gc_mark(): unknown data type 0x28(0xbfff9da8) non object

In your extension, you may have passed some integer value or other 
non-ruby object to a ruby API function that expected a VALUE. To catch 
the latter, enabling all compiler warnings may help.

> One odd thing is that the whole thing is quite random

bc it shows up during garbage collection

   T