AW: Screen freezing and Call Stack unavailable

Hi,

we had comparable problems with Release V5R1M0, CFINT and embedded SQL (in
either RPGIII or RPGIV programs).
Embedded SQL programs that caused the CFINT to start, get frozen and lost
their call stack. The only solution was to end the job abnormally. 
Other sessions that called the same program in parallel run very slow, but
didn't loose the call stack.

But there was an PTF (don't ask me which one) to fix this problem.

Birgitta

-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von James Viney
Gesendet: Dienstag, 10. Januar 2006 12:16
An: 'midrange-l@xxxxxxxxxxxx'
Betreff: Screen freezing and Call Stack unavailable

We are having a problem where some users of our in-house system are freezing
for several minutes.  The 'X' appears in the bottom left of the screen and
remains there until the screens 'unfreeze' and can affect many users at any
time.  The users affected can all be accessing different parts of the system
so trying to work out where the source of the problem lies is very
difficult,  They never timeout and to make it even more difficult to trace
the problem, if I try to view the call stack of one of the frozen users, my
screen then freezes for as long as the user's screen is!  Eventually, my
screen will either return with 'Call stack unavailable' or both screens will
be unfrozen and the call stack is now available.

Because we don't know if the problem is at file level, or which file(s)
is/are causing the problem is difficult to put a trace on anything.  Also it
can be weeks before the next incident occurs.

The system is written in RPG (v. old style to RPG ILE) and CL.  Synon was
also used extensively.  Fingers are being pointed at programming level
because users of other systems implemented on the same iseries do not have
this problem.

Can anyone advise why the Call Stack would be frozen and any action I can
take to find the problem.

Thanks,

James





James Viney
Senior Analyst/Programmer
Fortis Insurance Limited
Fortis House  Tollgate  Eastleigh  Hants  SO53 3YA
Tel: 02380 313324
Email: james.viney@xxxxxxxxxx
Registered Address: Fortis House  Tollgate  Eastleigh  Hampshire  SO53 3YA
Registered Number: 354568 England
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