IBM Support

DXWB control blocks fill Subpool 229 Key 7 and cause ABEND878 for IBM MQ

Troubleshooting


Problem

The IBM MQ queue manager is part of a Queue Sharing Group (QSG).  It receives ABEND878 due to a shortage of local or private storage in Subpool 229 Key 7 (SP229 KEY7).  Many pages of storage have eyecatchers of DXWB and EKTM.

Symptom

Symptoms vary according to which area of the code encounters the storage shortage. They might include:
  • The amount of free storage reported in CSQY220I decreases suddenly, and the message becomes more frequent:
    CSQY220I Queue manager is using mm MB of local storage, nn MB are free
  • Eventually storage might run out:
    CSQY221I Queue manager is short of local storage
    CSQY222E Queue manager is critically short of local storage - take action
  • ABENDS5C6 occurs with reason codes such as 00E2000B
  • ABEND878-00000010 occurs

Document Location

Worldwide

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Document Information

Modified date:
28 April 2025

UID

ibm16332733

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