A fix is available
APAR status
Closed as program error.
Error description
Error Descriptionᅬ You are running CICS transaction server 4.1 and receive the following error messages: DFHSM0002 A severe error (code X'030F') has occurred in module DFHSMGF. DFHIR3784 A severe error (code X'DD3C') has occurred in module DFHCRR.Connection xxxx (if non-blank) has been set out of service. . Looking at the dump from the SM0002 error, you will find the following exception: SM 030F SMGF *EXC* - Quickcell_freemain_QPF_already_free - FUNCTION(FREEMAIN) REMARK(RMOFRMLK) Module DFHRMLSO is attempting to freemain a recovery manager link object which is already free, causing the DFHSM0002 to be issued. Internal trace shows that COMMIT processing was called twice for the same token, Here is the commit trace point: . CRIU ENTRY PERFORM_COMMIT RMC_TOKEN(2B827030) CONTINUE(NO) SINGLE_UPDATER(NO) COORDINATOR(NO) INITIATOR(YES) RESTART(NO) UOW_STATUS(FORWARD) PRESUMPTION(ABORT) RECOVERY_STATUS(NECESSARY) SESSION_NAME <sss) . After the first commit, the task was detached from session tctte, making it available for use again. Before the task above ends, input arrives on this session causing CSNC to attach a new task on it. When the second commit processing is performed it now cleans up this session tctte which is being used by a different task.. which leads to the DFHIR3784 error. Additional Symptom(s) Search Keyword(s): KIXREVCTC
Local fix
Local Fix n/a
Problem summary
**************************************************************** * USERS AFFECTED: All * **************************************************************** * PROBLEM DESCRIPTION: CICS issues DFHSM0002 error code 030F * * for a double freemain of RMRORMLK * * storage. * **************************************************************** * RECOMMENDATION: * **************************************************************** Two CICS tasks are interleaving in recovery manager. The first task is running under an open TCB, iterating through the links in its UOW's linkset, calling each one to commit. The first link to be called is for an MRO connection. Having made this call, the link remains in the linkset while CICS awaits the inbound flow to notify it to delete it. While this syncpoint continues, the inbound flow is processed by CSNC, and recovery manager is called by this task (under QR) to remove the link. The logic in rmls_remove_link calls HOP_RemoveNode. This resets the first task's iterator, that was pointing at the MRO link. However, before this logic can proceed to remove the link object itself, the L8 task issues a getnext to step on to the next link in the linkset. This results in the iterator being reset to point at the MRO link once more. Then, the CSNC task (under QR) deletes the link, freeing its storage. This is followed by the syncpointing task (under its open TCB) making a second call to DFHCRIU to process the same MRO link once more. Recovery manager then attempts to delete the link, and gets the DFHSM0002 message and dump.
Problem conclusion
DFHRMLSO has been changed to acquire the RM domain lock around the call to get the next link during commit processing.
Temporary fix
FIX AVAILABLE BY PTF ONLY
Comments
APAR Information
APAR number
PM59871
Reported component name
CICS TS Z/OS V4
Reported component ID
5655S9700
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-03-08
Closed date
2012-03-16
Last modified date
2012-04-03
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UK77159
Modules/Macros
DFHRMLSO
Fix information
Fixed component name
CICS TS Z/OS V4
Fixed component ID
5655S9700
Applicable component levels
R700 PSY UK77159
UP12/03/23 P F203
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:
03 April 2012