On Tue, 25 Jun 2024 19:09:53 -0700, Ed Jaffe wrote: > ... >Years ago, one of our programmers fat-fingered a ZAP that accidentally >turned an MVC into an SCK (SET CLOCK) of =FD'-1'. It took down z/OS. It >kept crashing just a few minutes after everything was brought back up. > Eerily reminiscent of a Red Alert IBM issued a couple years ago. A macro, customer facing therefore hard to change, was doing a STCK to a wild address. When a certain bit in the TOD changed, IPL cod which tests that bit with no effect other than to crash when it had the wrong value would make the next IPL impossible.
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