A fix is available
APAR status
Closed as unreproducible in next release.
Error description
ESQA (SP239) and/or ECSA (SP241) becomes exhausted due to many suspended SRBs ( SSRB ) and DUCBs. The cause of the storage growth is due to contention on the IPMAIN lock. The DUCB causing the back up for the IPMAIN is suspended due to an unconditional request for CSM storage that is not available. The unconditional storage request came from module EZBIFIND - AllocateIpaMpcControl2
Local fix
KEYWORDS: SSRB SSRBs DUCB SP239 SP241 K6 subpool239 239 subpool241 key6 SQA ESQA CSM IPMAIN EZBIFIND x'f6000' f6000 ABEND878 ABEND4C5 2500 PTR MV23837 . VERIFICATION STEPS: - ESQA or ECSA storage is exhausted - IP TCPIPCS LOCK shows contention on the IPMAIN lock - Run the DUAF report ( IP TCPIPCS DUAF ) and locate the DUCB identified as holding IPMAIN lock - The calling module sequence should look similar to the following: DUAF report on OMPROUTE DUCB (x'23F0B000') shows it is suspended 10000C47 24C2DA58 23F0B000 23F0B100 00E3CC80 0149 OMPROUTE 00000 RSA 23F0B438 Prev 2BD7C0D0 Next 23F0B580 Mod EZBPFCLS IU SU RSA 23F0B588 Prev 23F0B438 Next 23F0B7C0 Mod EZBPFCLO RSA 23F0B7C8 Prev 23F0B588 Next 23F0BB70 Mod EZBRWSTR RSA 23F0BB78 Prev 23F0B7C8 Next 23F0BF40 Mod EZBIPSPI RSA 23F0BF48 Prev 23F0BB78 Next 23F0C6D0 Mod EZBIFIND RSA 23F0C6D8 Prev 23F0BF48 Next 23F0CA30 Mod EZBITSCS RSA 23F0CA38 Prev 23F0C6D8 Next 00000000 Mod EZBITDSS - Module EZBITSCS is called by EZBIFIND to unconditionally request CSM storage.
Problem summary
**************************************************************** * USERS AFFECTED: All users of the IBM Communications Server * * for z/OS Version 1 Release 2 IP: * * LCS & QDIO Devices * **************************************************************** * PROBLEM DESCRIPTION: Numerous suspended SRBs during period * * of critical CSM constraint. * **************************************************************** * RECOMMENDATION: * **************************************************************** An unconditional storage request during the processing of device layer control information left the IPMAIN lock held shared indefinitely. This occurred while the system was experiencing critical CSM constraint and resulted in many suspended SRBs for processes waiting on the IPMAIN lock. +-------------------------------------------------------------+ + Please check our Communications Server for OS/390 homepages + + for common networking tips and fixes. The URL for these + + homepages can be found in Informational APAR II11334. + +-------------------------------------------------------------+
Problem conclusion
Temporary fix
Comments
The storage requests have been changed to conditional.
APAR Information
APAR number
PQ58403
Reported component name
TCP/IP V3 MVS
Reported component ID
5655HAL00
Reported release
120
Status
CLOSED UR1
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2002-02-26
Closed date
2002-03-29
Last modified date
2002-05-15
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UQ64716 PQ60983
Modules/Macros
EZBIFIND EZBIFIUM EZBIFIUT EZBIPEPR EZBIPSPI TOMPHYSI TONFINSI
Fix information
Fixed component name
TCP/IP V3 MVS
Fixed component ID
5655HAL00
Applicable component levels
R120 PSY UQ64716
UP02/04/24 P F204
Fix is available
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Document Information
Modified date:
09 January 2021