Yes, and as s consequence, if he does not receive an 0C4, he will probably be 
clearing someone else's storage.

however the relation with 'the other subsystem' is also interesting.

Kees.


> -----Original Message-----
> From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On
> Behalf Of Binyamin Dissen
> Sent: 06 September, 2019 11:23
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: MPF Exit calling System REXX - S0C4 abend
> 
> Actually, you are incorrect.
> 
> The code is modifying storage beyond its area. Depending on how storage is
> set
> up, it is possible that the area will be on a page that is resolvable or
> not.
> 
> On Fri, 6 Sep 2019 04:08:37 -0500 Sebastian Welton <sebast...@welton.de>
> wrote:
> 
> :>Thanks to everyone who responded and although he tried out all the
> options provided, nothing actually worked however it looks like it is
> working now. The first step was to implement the original it was based
> upon from the Redbook and that worked fine out of the box. I then looked
> at what messages he was processing via MPF and saw a couple that looked
> familiar as being used by another subsystem which also 'traps' messages.
> Once I removed the startup of the STC and all references to it in PARMLIB
> (IEFSSN in particular), no more abends occurred. So it basically wasn't
> the fault of the code (apparently he has coded MPF exits before, just
> wanted to try a different method and to use System REXX) but the
> interaction with other subsystems. Personally I could have done this with
> System Automation in a couple of minutes but this is a good learning curve
> for both of us in particular during the investigation. Once again, many
> thanks to everyone who took the time and effort to reply, it
>   was
> much
> :>appreciated and did help in furthering our education (particularly me.)
> :>
> :>Seb.
> :>
> :>----------------------------------------------------------------------
> :>For IBM-MAIN subscribe / signoff / archive access instructions,
> :>send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
> 
> --
> Binyamin Dissen <bdis...@dissensoftware.com>
> http://www.dissensoftware.com
> 
> Director, Dissen Software, Bar & Grill - Israel
> 
> 
> Should you use the mailblocks package and expect a response from me,
> you should preauthorize the dissensoftware.com domain.
> 
> I very rarely bother responding to challenge/response systems,
> especially those from irresponsible companies.
> 
> ----------------------------------------------------------------------
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> send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
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