A fix is available
APAR status
Closed as program error.
Error description
Abend C0D in IOS module IECVEXSM, EXCP Storage Manager because a private block is chained together with the SQA large blocks. The private block should have been removed from the chain earlier in EXCP I/O clean up processing before the chain of blocks was returned to the EXCP storage manager to be returned to the pool for use by another I/O request. Abend C0D is declared for any block that does not have the allocation byte field set to x'76'. Since the private blocks have already been returned to storage by the time the EXCP storage manager is checking, the storage referenced will be all 0's. This error can also be seen as a 0C4-11 in IECVEXSM with a translation exception that points to the private blocks area that was just freemained in the system trace. ANALYSIS: Registers at the time of the dump: Reg. 1 - Abend Code - C0D Reg. 3 - Reason Code - 04 - Large Block Free Request Reg. 5 - Forward Chain Pointer Reg. 11 - Current Chain Pointer Reg. 13 - Save Area that points to register values at time of entry to IECVEXSM. In the syslog the EXCP request for the I/O will have a Getmain before the SSCH and the SRB tied to the completed I/O will have a freemain in IECVPBLK just before the C0D abend. KNOWN IMPACT: Abend occurs after the I/O is complete during clean up of control blocks. No impact on current or successive I/O's. VERIFICATION STEPS: Using the save area, the first entry is Reg. 1 on entry to IECVEXSM which is the first block on the chain. Run the chain and verify that the final block on the chain points to a private block area and not into SQA. From syslog (complete I/O trace): SVC 0 00000000_36E9EF78 00F04E80 386E8570 000303C0 Excp 47850400 80000000 SSRV 78 810961EE 0000E676 00001000 7F6DF000 Getmain 004B0000 SSCH 12185 00 02 020C512C 02760700 83C2F781 3C77D0E8 007B9700 SVCR 0 00000000_36E9EF78 00000000 00000200 000303C0 47850400 80000000 I/O 12185 00000000_36E59D08 80C04007 37405360 0C000000 47852001 80000000 02760700 0001000D SRB 00000000_013A1370 0000004B 020C5100 020C512C 47040000 80000000 007F8588 80 SSRV 78 81096300 0000E603 00001000 7F6DF000 004B0000 Freemain *SVCE D 00000000_01753FAE 01753DA8 00001000 00C0D000 47041000 80000000 00000004 The final block on the chain should point into the page that was freemained just before the abend.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * Users at HBB77A0 and above who use EXCP * * with 64 bit IDAWS. * * * **************************************************************** * PROBLEM DESCRIPTION: * * ABENDC0D or ABEND0C4 in IECVEXSM * **************************************************************** * RECOMMENDATION: * **************************************************************** Abend C0D or abend 0C4 in IECVEXSM when using EXCP with 64 bit IDAWs.
Problem conclusion
IECVXCCW is updated to eliminate the C0D or 0C4 when using 64-bit IDAWS.
Temporary fix
Comments
APAR Information
APAR number
OA56384
Reported component name
EXCP
Reported component ID
5752SC1C6
Reported release
7A0
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-10-25
Closed date
2019-03-12
Last modified date
2019-04-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UA98745 UA98746
Modules/Macros
IECVXCCW
Fix information
Fixed component name
EXCP
Fixed component ID
5752SC1C6
Applicable component levels
Fix is available
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Document Information
Modified date:
02 April 2019