Joe,

You're saying that you did get output of
00000001 7FFFFF88 00001000 00000001 7FFFFFF88 00000500
within the returned data from the VSMLIST invocation you had shown?

I can't think of a way that that would be OK. Unless I'm forgetting something, 
it would be APARable and I'd encourage you to explore that direction.

Regarding the high bit, it's documented. Specifically, "Format of Allocated 
Block Descriptor" with
https://www.ibm.com/docs/en/zos/2.5.0?topic=area-allocated-storage-information<https://www.ibm.com/docs/en/zos/2.5.0?topic=area-allocated-storage-informationI>

You're treading dangerously, again, in the waters of providing incomplete 
information.
You didn't provide complete information about your VSMLIST output, you didn't 
show how you had invoked VSMLOC and with what values when you said it didn't 
work, and  now, with "FF7A5000", you show just the single address. Your thought 
about what that is is likely correct, but don't make us guess (the folks kindly 
helping out on IBM-Main, whether IBMers, customers, or ISVs have real work to 
do too). I choose not to participate in such a game.

Peter Relson
z/OS Core Technology Design


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