A fix is available
APAR status
Closed as program error.
Error description
ABENDHTT001 can occur when CHPIDS are varied off and Monitor is enabled. Monitor chains through CUIBKs, Control Unit Information Blocks, to collect information about current I/O Devices. If a device is varied offline as Monitor is chaining through these control blocks it is possible the storage for the CUIBK has been released which results in an HTT001 ABEND.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of z/VM who vary off CHPIDs with * * Monitor enabled. * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** ABENDHTT001 can occur when CHPIDS are varied off and CP Monitor is enabled. Monitor chains through CUIBKs, Control Unit Information Blocks, to collect information about current I/O Devices. If a device is varied offline as Monitor is chaining through these control blocks it is possible the storage for the CUIBK has been released which results in an HTT001 ABEND.
Problem conclusion
The Monitor parts, HCPMOM and HCPMNO, are updated to get the SYSCUILK lock prior to scanning the CUIBK tree. This will prevent a member in the tree from being deleted while Monitor is scanning the tree avoiding the abend. Once monitor is done processing the lock is released.
Temporary fix
********* * HIPER * ********* FOR RELEASE VM/ESA CP/ESA R640 : PREREQ: NONE CO-REQ: NONE IF-REQ: NONE FOR RELEASE VM/ESACP/ESAR710 : PREREQ: NONE CO-REQ: NONE IF-REQ: NONE
Comments
APAR Information
APAR number
VM65689
Reported component name
VM CP
Reported component ID
568411202
Reported release
640
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-09-13
Closed date
2019-07-23
Last modified date
2020-12-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UM35432 UM35433
Modules/Macros
HCPMNO HCPMOM
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:
12 January 2021