A fix is available
APAR status
Closed as program error.
Error description
Below the line CSA growth can occur in SP227 KEY6 due to stranded DLRPL control blocks when Enterprise Extender IPRESOLV is non-zero and HOSTNAME RESOLUTION timeouts occur. Stranded VTALLOC storage is x'265' bytes long. SYSLOG may include the following messages: IST1893I NAME-TO-ADDRESS RESOLUTION FAILED IST1909I REMOTE HOSTNAME remotehostname
Local fix
Circumvention is to code IPRESOLV=0 on both XCA major node (PORT) and all Enterprise Extender switched major nodes.
Problem summary
**************************************************************** * USERS AFFECTED: All using predefined switched PU Enterprise * * Extender (EE) connections with HOSTNAME * * defined on the PATH, and using a non-zero * * value for IPRESOLV, which is also * * defined on the PATH. * **************************************************************** * PROBLEM DESCRIPTION: Subpool 227 CSA (Key 6) storage below * * the line usage increases. This * * increase is due to DLRPL control blocks * * not being freed during dial-out * * processing. * **************************************************************** * RECOMMENDATION: * **************************************************************** The problem is summarized as follows: 1) A dial-out request is initiated to establish an EE connection for a switched PU. 2) The switched PU PATH definition, within the switched major node, contains a HOSTNAME of that of the partner EE node. This particular PATH also has a non-zero value specified for IPRESOLV. IPRESOLV is a parameter used to timeout the hostname resolution request initiated to the TCP/IP stack. 3) Module ISTACCQH receives control to initiate CONNOUT processing. Since HOSTNAME is coded on the PATH definition, the GAIPATH routine gets control to handle HOSTNAME resolution processing. A DLRPL control block is allocated for this process. A timer is set to limit the length of time the process will wait on HOSTNAME resolution. The timer is set to the value specified for the IPRESOLV definition. 4) ISTINCDP is dispatched to process the hostname resolution. A subtask is kicked off to invoke module ISTAUCEX to service this request. 5) In this case, the TCP/IP stack does not return the hostname resolution request prior to the IPRESOLV timer expiring. 6) Module ISTACCQH is driven with the IPRESOLV TQE. This causes subroutine TQEPPROC to allocate a PURGE DLRPL to purge the outstanding hostname resolution request DLRPL. The PURGE DLRPL is sent to ISTINCDP for processing. 7) ISTINCDP is dispatched to process the PURGE DLRPL, but the hostname resolution DLRPL is not found by ISTINCDP. This leaves the original DLRPL, allocated in step 2, stranded. Over time, this process can be cause a storage creep in SP277 below the line storage.
Problem conclusion
ISTINCDP - Modified the definition of QELEMENT within subroutine QMANAGER to match that of the corresponding DLRVT_SSTBLK structure. The definition mismatch caused ISTINCDP not to locate the hostname resolution DLRPL, which is mapped by the QELWKE within the QELEMENT structure. ISTAUCLA - Included for maintenance purposes.
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
OA35194
Reported component name
VTAM V4 MVS/ESA
Reported component ID
569511701
Reported release
1B0
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2010-12-15
Closed date
2011-01-11
Last modified date
2011-04-04
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UA58708 UA58709
Modules/Macros
ISTAUCLA ISTINCDP
Fix information
Fixed component name
VTAM V4 MVS/ESA
Fixed component ID
569511701
Applicable component levels
Fix is available
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Document Information
Modified date:
04 April 2011