On Thu, 26 Jun 2008 13:19:19 EDT, IBM Mainframe Discussion List 
<[EMAIL PROTECTED]> wrote:

>... one of its five exit addresses set to X'80000000'. ...
>...  The high-order bit is  interpreted for setting the
>addressing mode by the component that calls the exit  routine, and if 
>the exit address is zero then a default IBM exit is used  instead.  ...

Another reason for X'80000000' would be a null last entry in a 
variable length parameter list.  And I could imagine someone not
checking for that.  (A null entry at the end of a variable list? Who
would do THAT?)   And if the code is in a seldomly executed path in 
seldomly invoked error recovery code it could have gone unnoticed
for a long time.    

A PMR sounds appropriate to me.  Too bad you won't be able to
reproduce it.  :-(

Pat O'Keefe

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