A fix is available
APAR status
Closed as unreproducible.
Error description
. This APAR is a FIN REVERSAL of APAR PM73523. . Storage growth in ECSA, eventually leading to multiple S878 ABENDs in various address spaces. Examination of storage usage will show numerous SP241K6 areas x174000 bytes long that start with a DUCB eye-catcher at offset +18. To confirm the growth is associated with this problem: - TCPIP must have VIPAROUTE configured. - A TCPIPCS LOCK(DETAIL) report will show many DUCBs waiting on the IPMAIN and (likely) XCF locks. The holder of the IPMAIN lock will show a pattern similar the following: asid ducbaddr ... Iu Su Lock Class 03: ... Lock Level 01: ... Held Shr EnqH IPMAIN asid ducbaddr ... Iu Su Lock Class 09: ... Lock Level 07: ... Wait Excl XFVRT And the holder of the XFVRT lock will show: asid ducbaddr ... Iu Su Lock Class 03: ... Lock Level 01: ... Wait Shr IPMAIN asid ducbaddr ... Iu Su Lock Class 09: ... Lock Level 01: ... Held Excl EnqH XCF Lock Level 07: ... Held Shr EnqH XFVRT
Local fix
. Requires recycling TCPIP. May need to do a FORCE ARM. . This APAR is a FIN REVERSAL of APAR PM73523.
Problem summary
**************************************************************** * USERS AFFECTED: All users of the IBM Communications Server * * for z/OS Version 1 Release 13 IP: Sysplex * * distributor with VIPAROUTE * * * * * **************************************************************** * PROBLEM DESCRIPTION: A deadlock occurs when locks are * * obtained out of order. * **************************************************************** * RECOMMENDATION: * **************************************************************** A deadlock occurs when two separate threads try to obtain the same two locks, but one thread obtains the locks in the wrong order. The first thread initially obtains the locks in the correct order. It releases the first lock without releasing the second lock. It tries to obtain the first lock again, but a second thread is holding the first lock so the first thread goes into a wait. The second thread is waiting for the second lock which is held by the first thread. Both threads will now wait indefinitely while holding their respective locks. +-------------------------------------------------------------+ + 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
********* * HIPER * *********
Comments
The code will be changed to always release both locks when the first lock must be released. Then both locks will obtained in the correct order.
APAR Information
APAR number
PI16269
Reported component name
TCP/IP V3 MVS
Reported component ID
5655HAL00
Reported release
1D0
Status
CLOSED UR3
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt
Submitted date
2014-04-18
Closed date
2014-05-06
Last modified date
2014-07-01
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI17738
Modules/Macros
EZBIERTE EZBIFIUM EZBIPPBR EZBIPRHD EZBIPRTE EZBIPRT2 EZBXFDYN EZBXFGP2 EZBXFHSH EZBXFMS2 EZBXFMS4 EZBXFPTB EZBXFTMR EZBXFUTL EZBX6HSH EZBX6MS2 EZBZIPBR ITTIMER
Fix information
Fixed component name
TCP/IP V3 MVS
Fixed component ID
5655HAL00
Applicable component levels
R1D0 PSY UI17738
UP14/06/21 P F406
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:
01 July 2014