A fix is available
APAR status
Closed as program error.
Error description
In some cases, a CPU can be stuck in a loop when Minidisk Caching is on. Eventually this will cause a system hang or abend.
Local fix
This problem can be circumvented by issuing the CP SET MDC SYSTEM OFF command. While this command avoids the problem, it might cause performance degradation.
Problem summary
**************************************************************** * USERS AFFECTED: All users of Minidisk Cache. * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** In some cases, a CPU can be stuck in a loop while Minidisk Caching is on. This will cause a system hang.
Problem conclusion
A LA instruction in HCPFMI, in 31 bit addressing mode, resulted in the address 7FFFFFF8 being incremented to 0 rather than 80000000. This resulted in the subsequent CR/BrNH branching when it should have fallen through. Code in HCPFMI was changed such that a AHI instruction was used for the addition and a CLR was used for the test.
Temporary fix
FOR RELEASE VM/ESA CP/ESA R640 : PREREQ: NONE CO-REQ: NONE IF-REQ: NONE FOR RELEASE VM/ESA CP/ESA R710 : PREREQ: NONE CO-REQ: NONE IF-REQ: NONE
Comments
APAR Information
APAR number
VM66209
Reported component name
VM CP
Reported component ID
568411202
Reported release
640
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-09-20
Closed date
2018-10-04
Last modified date
2019-06-26
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UM35370 UM35371
Modules/Macros
HCPFMI
Fix information
Fixed component name
VM CP
Fixed component ID
568411202
Applicable component levels
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:
26 June 2019