A fix is available
APAR status
Closed as program error.
Error description
A loop condition with an high CPU consumption is detected in DFHFCMN , the Coupling Facility Data Table CFDT server . Problem happens when the ELEMENTWARN and ENTRYWARN parameters of CFDT server are SET to a lower value than the actual. The loop condition is detected into module DFHCFCFN into csect DFHCFCFN (Notify subtask, handles warnings and ALTER requests ). If the ELEMENTWARN and ENTRYWARN are set back to the original value, the loop condition doesn't stop. To go back to the normal bahaviour, a CFDT server startup is required.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All * **************************************************************** * PROBLEM DESCRIPTION: Coupling Facility Data Table server * * address space loops with high CPU * * usage. * **************************************************************** * RECOMMENDATION: * **************************************************************** A CFDT server has an ENTRYWARN threshold less than its ENTRYWARNINC setting. When the server adjusts the threshold, it produces a negative value which is treated as a large positive (unsigned) number. This makes the server loop, trying to reduce the next threshold even lower. In addition, both the shared temporary storage server and the named counter server can encounter the same symptom. Note - the same problem exists for ELEMENTWARN and ELEMENTWARNINC. KEYWORDS: NCS
Problem conclusion
The CFDT, NC and STS server logic has been changed to limit the decremented value to zero.
Temporary fix
FIX AVAILABLE BY PTF ONLY
Comments
APAR Information
APAR number
PM18974
Reported component name
CICS TS Z/OS V4
Reported component ID
5655S9700
Reported release
600
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-07-22
Closed date
2010-08-12
Last modified date
2010-09-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UK59589
Modules/Macros
DFHCFCF DFHNCCF DFHXQCF
Fix information
Fixed component name
CICS TS Z/OS V4
Fixed component ID
5655S9700
Applicable component levels
R600 PSY UK59589
UP10/08/18 P F008
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
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Document Information
Modified date:
02 September 2010