Public bug reported:

Description of thread_stack variable : 
The default of 192KB (256KB for 64-bit systems) is large enough for normal 
operation. If the thread stack size is too small, it limits the complexity of 
the SQL statements that the server can handle, the recursion depth of stored 
procedures, and other memory-consuming actions. 
http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html#sysvar_thread_stack

Thus, Debian / Ubuntu have exactly the set thread_stack = 192K on any
platform, on amd64 it may have broken some of the complex triggers.

** Affects: mysql-5.1 (Ubuntu)
     Importance: Undecided
         Status: New

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hread_stack must be removed to avoid problems for amd64
https://bugs.launchpad.net/bugs/650936
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