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I only had similar problems once in 2008 ca., but then subtasking was involved
and APL etc., and there was some sort of race condition where one subtask ran
too fast and the POST/WAIT protocol dit not work ... ABEND S201, IIRC ... the
error was in IBM code, not in ours.

The problem occured only on newer hardware with many processors, only every 5
hours or so, and only when there was heavy load by other concurrent jobs. IBM
maintenance was not able to reproduce the error, because our machines were
faster than theirs.

Very hard to find ...

I don't think that such problems may be involved here ...

another idea that comes to mind: areas of storage that are normally zero, but
now due to opsys release changes etc. are non-zero, and the application (which
by error doesn't initialize some automatic variables properly) now fails. That
is: a programming error that was there all the time, but now shows up for the
first time.

Don't know, if those "war stories" help in any way ... without looking at the
dumps, I can't do any better.

Kind regards

Bernd




Am 10.10.2014 08:05, schrieb J.C.:
> It appears that we captured relevant problem data via GTF tonight, so "we
> shall see what we shall see, when we see it".
>
>      -jc-
>
>

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