> expose latent defects in code that happens to seem to work when reserved fields contain zeroes
Need to test the other side of that coin: code that only works when a reserved field contains non-zeroes. <g> Obviously there is no limit to the possible conditions. What about code that erroneously tests one bit of some reserved field, or does an erroneous TM/BM on some reserved field? Software testing, as all of us know too well, is a fraught exercise. Finding bugs is not too bad; it's the finding of the *absence* of bugs that is tough. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Jim Mulder Sent: Tuesday, February 22, 2022 11:38 AM To: [email protected] Subject: Re: 2.5 Heads Up Yes, the undocumented (but disclosed to ISVs) IGVDGNPP test tool will modify all of the reserved fields in every CPU's PSA in order to expose latent defects in code that happens to seem to work when reserved fields contain zeroes. But since that may expose latent defects in other code (IBM, ISV, or customer), it's not the kind of thing you would want to use on a production system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
