A fix is available
APAR status
Closed as program error.
Error description
A guest issued an SPXTAPE command. During the rewind of the tape an HTT001 abend occurred because the issuer had logged off. When the response to the rewind was received, HCPIOS referred to a VMDBK that no longer existed leading to the HTT001 ABEND.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of SPXTAPE on z/VM * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** ABENDHTT001 when a hardware issue hangs a tape disposition I/O operation (REWIND, REW and UNLOAD) to a tape drive at the end of an SPXTAPE command's processing. All other processing for the command can complete prior to the disposition operation which is running asynchronously. This frees up the user to logoff even though that last operation remains outstanding because of the hang. Eventually the missing interrupt handler (MIH) detects the hang and the HTT001 abend can occur if the missing interrupt handler tries to access the VMDBK of the command issuer which has been released due to the logoff.
Problem conclusion
The SPXTAPE command issuer's deferred work count (VMDDFRWK) is incremented just before the tape disposition operation is started and decremented when the operation completes. This guarantees that the deferred work count is non-zero across the I/O operation and prevents the user from logging off.
Temporary fix
********* * HIPER * ********* 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
VM65708
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
2018-10-11
Closed date
2019-05-23
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:
UM35374 UM35375
Modules/Macros
HCPSFR HCPSPZ
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.
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG27M","label":"APARs - z\/VM environment"},"Platform":[{"code":"PF054","label":"z\/OS"}],"Version":"640","Line of Business":{"code":"LOB16","label":"Mainframe HW"}}]
Document Information
Modified date:
12 January 2021