A fix is available
APAR status
Closed as program error.
Error description
An outage occurred for the Queue Sharing Group (QSG). One memeber of the QSG received CSQE034E CSQ0 CSQERWI2 Recovery phase 2 failed for structure CICS connection name CSQEMQGPCSQ002, RC=00000004 reason=00000412 xxxx0412 means IxlRsnCodeLockHeldBySys: For a LOCKOPER=READNEXT or LOCKOPER=TEST request, the lock is not generally available. The lock is not held by any connection, but instead is held by the system. Another member of the QSG received Dump Title: CSQL,ABN=5C6-00C510AD,U=SYSOPR , -CSQEOCRQ,M=CSQGFRCV,LOC=CSQELPLM.CSQEOCRQ Dump Title: CSQL,ABN=026-08110102,U=SYSOPR -CSQERWI2,M=CSQGFRCV,PSW=470C400081442702 Dump Title: ABEND=S026,REASON=08118001,CONNECTOR HANG: CONNAME=CSQEMQGPCSQL06,JOBNAME=CSQLMSTR In response to an EEPLDISCFAILCONNECTION event, a queue manager may need to get locks on the list headers in the structure in order to perform recovery processing. This results in an unconditional list lock request being made from phase 2 recovery. If the lock was held by one of the failed connections, XES will not release the lock until the connection failure event has been resolved. This causes the structure recovery processing to hang in the unconditional list lock request. This task remains stuck until XES hang resolution processing abends the queue manager task with the 026 abend. Additional Symptom(s) Search Keyword(s): 00C510AD 08110102 08118001 ABEND026 ABENDS026 026 S026 S0026 0412
Local fix
Restart of the failed queue manager should be successful
Problem summary
**************************************************************** * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 8 * * Release 0 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Peer level recovery (PLR) for a failed * * connector to a structure hangs waiting * * for a lock unconditionally, leading to * * abend 026-08110101 in CSQELPLM.CSQERWI2 * * initially, followed later by abend * * 026-08110102 in CSQELPLM.CSQERWI2 and * * abnormal queue manager termination * * 6C6 with REASON=00C510AB. * * While the connector is hung, other * * queue managers attempting to lock the * * same list header can fail with return * * code IxlRsnCodeLockHeldBySys (00000412) * **************************************************************** * RECOMMENDATION: * **************************************************************** During Peer Level Recovery (PLR) for a failed connection to a structure, CSQERWI2 issues an unconditional request for a lock on a list header in the structure. While CSQERWI2 waited for the lock to become available, the current holder of the lock also failed, leading to XCF taking ownership of the lock until the failure events have been responded to. However, while CSQERWI2 is waiting for the lock, it is unable to respond to any failure events, leading to a deadlock condition occurring.
Problem conclusion
CSQERWI2 is changed to handle the holder of the required lock failing during PLR. 000Y CSQEQUER CSQERWI2
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
PI44852
Reported component name
WMQ Z/OS 8
Reported component ID
5655W9700
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2015-07-13
Closed date
2015-07-23
Last modified date
2015-09-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI29668
Modules/Macros
CSQEQUER CSQERWI2
Fix information
Fixed component name
WMQ Z/OS 8
Fixed component ID
5655W9700
Applicable component levels
R000 PSY UI29668
UP15/08/11 P F508 ¢
Fix is available
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Document Information
Modified date:
02 September 2015