>a) I see a couple of FREEMAIN (SSRV 78) trace entries pointing to a TCB in 
>read/write nucleus (TCB address is 00FDD4F8). Do these hold some useful 
>information for me?
The only tcb I know of that actually, really is located in the R/W nucleus is 
the first tcb in the *master* address space. Every address space started after 
that starts with a tcb in LQSA. So unless the SSRV entries were for asid(1), I 
would find a tcb address in R/W nucleus highly suspicious. Have you checked the 
storage FDD4F8? Is it really a tcb? (Easiest way to check is a cbf x'fdd4f8' 
str(tcb). If the eyecatcher is not there, the formatter will tell you).

b) I know "SVC D" is also entered for normal task termination. In an oooold MVS 
debugging manual I found that the first byte of R1 is x'08' this indicates RTM2 
is called for task termination cleanup. The x'08 does no longer seem to hold 
true. How can I identify such an non-error an SVC D entry?
Error entries usually have an asterisk is front of the word SVC. I learned 
early on to do a "f '*'" in the trace table to find the entry for the abend. If 
you don't see the *rcvy entries following the svc d, chances are that you're 
looking at normal termination. Another indication is that IIRC normal 
termination doesn't have an abend code.

c) In some dumps I see "SVC 3" (exit) trace entries, sometimes I can see the 
"SVC 3E" (DETACH), sometime it is not in the trace.
What's the question on this? Did you format the trace table using 'jobname(your 
jobname)'? Given the number of dumps you had and the abend codes, there should 
be some form of common denominator. 23E and 53E are both detach abends, so I 
would expect to see an SVC 3E entry. Detach does some validity checking and 
then issues these abends. So at the time of detach you already have an overlay.
Always look at the earlieast error indication. Are there logrec entries for it? 
What is that error? If it is a pic11, check the earlier trace table in that 
address space for a freemain - sometimes it is a larger range that got freed. 
Does a summary format on the problem address space work without errors? Is 
there more than one tcb with a completion code?

Barbara

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