A fix is available
APAR status
Closed as program error.
Error description
The customer experienced an ABEND; ABN= 0C4-00000004,M=CSQXSMFT, LOC=CSQXSMFT.???????? . The reason for the abend is a timing/serialization issue at startup whereby the SMF task can start processing SMF data before the SSL task control blocks have been correctly initialized. . Additional Symptom(s) Search Keyword(s):
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * All users of IBM MQ for z/OS Version 9 Release 0 * * Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: * * Abend S0C4 may occur in module CSQXSMFT at Channel Initiator * * startup. * **************************************************************** * RECOMMENDATION: * **************************************************************** At Chinit startup, the Chinit SMF task is attached as an asynchronous TCB, but is dependent on some other storage initialization that may not have yet occurred. There is a race condition between the SMF task and mainline initialization where it's possible for the SMF task to attempt to access storage that has not yet been correctly initialized.
Problem conclusion
Synchronization has been added during Chinit startup to ensure that the necessary storage is initialized before being accessed by the SMF task.
Temporary fix
Comments
APAR Information
APAR number
PI76166
Reported component name
MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-02-07
Closed date
2017-04-19
Last modified date
2017-06-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI46533
Modules/Macros
CSQXSMFT
Fix information
Fixed component name
MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R000 PSY UI46533
UP17/05/19 P F705
Fix is available
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Document Information
Modified date:
02 June 2017