Is WebSphere MQ for z/OS waiting?

If your investigations indicate that WebSphere MQ itself is waiting, check the following:

  1. Use the DISPLAY THREAD(*) command to check if anything is connected to WebSphere MQ.
  2. Use SDSF DA, or the z/OS command DISPLAY A,xxxxMSTR to determine whether there is any CPU usage (as shown in Has your application or WebSphere MQ for z/OS stopped processing work?).

If you are satisfied that WebSphere MQ has actually stalled, use the STOP QMGR command in both QUIESCE and FORCE mode to terminate any programs currently being executed.

If the STOP QMGR command fails to respond, cancel the queue manager with a dump, and restart. If the problem recurs, refer to Working with IBM(R) to solve your problem for further guidance.