> It's the workarea length ... 004C0         105 LCLDSCTL EQU   *-LCLDSECT
> LENGTH OF LOCAL WORK AREA  00410000

>  SSRV    78          9F00130A  00000000 00000000 00000000  Getmain
> CCB45F68C0337D48   05
>                                003D0000
> 
>  PGM    004 00000000_1F001320  00040004 00000000           00000001 
00000000
> 003D 003D CCB45F68C034FF2C   05
>             07040000 80000000           00000000           00000000
> 
> *RCVY  PROG                    940C4000 00000004 00000000  00000001 
00000000
> 003D 003D CCB45F68C06843A6   05


  The SSRV  78 entry shows that the requested length was 0.
When a length of 0 is requested on GETMAIN or STORAGE OBTAIN,
VSM treats this as a successful request, and returns an address of 0.
In my opinion, this was a poor design choice, made long before my time,
and I have seen it lead to diagnosis confusion like this several times
over the years. I would have preferred to abend when a length of 0
is requested. But it has worked this way since at least MVS/370,
and maybe even long before that, so for compatibility reasons, 
we do not change it. 

 Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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