Investigating stalls

When CICSPlex® SM doesn’t seem to be responding, you should suspect a stall condition, which could be either a loop or a wait.

Note:
In the case of a suspected loop or wait, you should request an SDUMP; CICSPlex SM will not take one automatically. However, do not cancel the task that appears to be stalled before requesting the dump. If you cancel the task, the CICS® and CICSPlex SM recovery routines that get control will change the "picture" taken by the dump and you may lose valuable diagnosis information.

You will need to determine both at what stage of processing the stall occurred and where it occurred. Processing a CICSPlex SM request involves multiple address spaces. The process could stall in the TSO/ISPF session, in any of the CICS systems included in the current context and scope, or at any of several points in between.

Use the information in this section to help you isolate the cause of a stall or to report the condition to customer support personnel.

An undetermined stall condition

Questions to ask
Documentation to collect

A suspected loop

Questions to ask
Documentation to collect

A suspected wait

Questions to ask
Documentation to collect

An unformatted dump is the preferred source of problem diagnosis information for a stall. You should format a CICSPlex SM dump only at the request of customer support personnel.

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