A fix is available
APAR status
Closed as program error.
Error description
A loop occurs during MQGET browse processing in routine zrfConvertAllPropertiesToMQRFH2 in CSECT CMQZRFPA of load module CSQTOPLM. The eyecatcher prior to the PSWs for EXT, CLKC, and DSP entries in systrace is | ..}...x4..zrfCon | | vertAllPropertie | | sToMQRFHEP(CSQTZ | | R10)T\-...T0\... | i.e. it has zrfConvertAllPropertiesToMQRFH and EP(CSQTZR10). The loop is occurring due to a ZRFP control block containing invalid data. The problem seems to have been caused by a destructive MQGET taking place at the same time as the browse, so the browse has been processing a reused IRH9 header block, so hence the ZRFP is incorrect. In the reported case, the application was a CICS transaction. It could not be killed, so the CICS region had to be cancelled. Additional Symptom(s) Search Keyword(s): performance looping inflight in-flight CSQTZR10
Local fix
Cancel the looping application and restart it.
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Applications browsing a queue * * containing messages with message * * properties and/or RFH2 headers loop in * * CMQZRFPA. * **************************************************************** * RECOMMENDATION: * **************************************************************** While browsing a queue, an application locates a message containing message properties (which may originally have been provided in an RFH2 header) and copies them from the pages containing the message to a temporary buffer, however just prior to the copy occurring the message was deleted by another application and the pages reused for a subsequent message, and so the reused data was copied into the temporary buffer. When CSQIMGE9 subsequently called CSQMHDRS to process any message properties, the invalid properties data can be passed to zrfConvertAllPropertiesToMQRFH or zrfMoveProperties. These routines expect valid properties data, however as the passed data was invalid, this resulted in a loop due to invalid values at the offset where a length was expected.
Problem conclusion
CSQIMGE9 is changed to check if the message has been deleted prior to calling CSQMHDRS during browse operations. MQMSGPROP/K 100Y CSQIMGE9
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
PI44402
Reported component name
WMQ Z/OS V7
Reported component ID
5655R3600
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-07-06
Closed date
2015-10-12
Last modified date
2018-03-12
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
PI49242 UI31933
Modules/Macros
CSQIMGE9
Fix information
Fixed component name
WMQ Z/OS V7
Fixed component ID
5655R3600
Applicable component levels
R100 PSY UI31933
UP15/11/11 P F511
Fix is available
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Document Information
Modified date:
12 March 2018