A fix is available
APAR status
Closed as program error.
Error description
In some cases, virtual machines using the *VMEVENT IUCV System Service can cause a deadlock where the system appears hung.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: Users running guests with connections to the * * *VMEVENT IUCV system service * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** The *VMEVENT IUCV System Service acquires the SYSTEM IUCV lock unnecessarily. If a guest with a connection to *VMEVENT happens to issue an IUCV instruction associated with another connection to SYSTEM while a *VMEVENT notification is being delivered, a deadly embrace can occur, eventually leading to most guests becoming inoperative.
Problem conclusion
Code has been changed to not acquire the SYSTEM IUCV lock when processing *VMEVENT notifications.
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
VM66330
Reported component name
VM CP
Reported component ID
568411202
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-10-02
Closed date
2019-10-16
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:
UM35551 UM35552
Modules/Macros
HCPVME
Fix information
Fixed component name
VM CP
Fixed component ID
568411202
Applicable component levels
Fix is available
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[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG27M","label":"APARs - z\/VM environment"},"Platform":[{"code":"PF054","label":"z\/OS"}],"Version":"710","Line of Business":{"code":"LOB16","label":"Mainframe HW"}}]
Document Information
Modified date:
12 January 2021