APAR status
Closed as program error.
Error description
When replicating rows containing compressed partition blobs in an Enterprise Replication environment an Assert Failure may occur indicating memory corruption. An example AF is: Pool 'CDRGeval1' (0x4665e040) Bad free block 0x466aa458 Assert Failed: Memory free block header corruption detected in mt_shm_malloc_segid 3 IBM Informix Dynamic Server Version 12.10.FC14 Who: Session(48, informix@server1, 0, 0x44f3ebe8) Thread(75, CDRGeval1, 44efd6e8, 1) File: mtshpool.c Line: 1834 Results: Unable to repair pool free list Action: Please notify IBM Informix Technical Support. stack trace for pid 29128 written to /dumpdir/server1/af.433b9ad See Also: /dumpdir/server1/af.433b9ad The contents of the AF file include: Found during mt_shm_malloc_segid 3 Pool 'CDRGeval1' (0x4665e040) Bad free block 0x466aa458 blk-64 00000000466aa418: 764f3854 47366179 6a463834 51423673 vO8TG6ay jF84QB6s 00000000466aa428: 78545638 61446d35 4c717848 4a474842 xTV8aDm5 LqxHJGHB 00000000466aa438: 61745142 63663142 43202058 73203167 atQBcf1B C Xs 1g 00000000466aa448: 69467533 75397a6e 54635657 744c4239 iFu3u9zn TcVWtLB9 blk+64 00000000466aa458: 6d6a4f69 5320697a 6f344452 65723878 mjOiS iz o4DRer8x 00000000466aa468: 6777755a 7377704a 4e484e20 78566972 gwuZswpJ NHN xVir 00000000466aa478: 707a7362 38425174 7162674c 34714644 pzsb8BQt qbgL4qFD 00000000466aa488: 38574945 705a3745 4d764d45 71716472 8WIEpZ7E MvMEqqdr Stack for thread: 75 CDRGeval1 afstack afhandler affail_interface mt_shm_malloc_segid mt_malloc old_do_rhpstart grouperEvalThread cdrTrampolineThread th_init_initgls startup The corrupted memory block headers may include evidence of the uncompressed partition blob data. Other types of Assert Failure are possible including those that cause a fatal exception and crash the server. Example thread stacks shown in such AFs include: Stack for thread: 75 CDRGeval1 afstack mt_ex_throw_sig afsig_handler <signal frame> fmclose cdr_db_closetab rqmCloseHandleInt grouperEvalThread cdrTrampolineThread th_init_initgls startup Stack for thread: 269 sqlexec afstack afhandler afcrash_interface mt_free_mutex destroy_session sqsetconerr _iread _igetint sqmain On restart of the server it is also possible that further Assert Failures may be raised by a CDRGeval thread, for example: Assert Failed: No Exception Handler IBM Informix Dynamic Server Version 12.10.FC14 Who: Session(34, informix@server1, 0, 0x44f3d748) Thread(61, CDRGeval0, 44efe8a8, 1) File: mtex.c Line: 508 Results: Exception Caught. Type: MT_EX_OS, Context: mem Action: Please notify IBM Informix Technical Support. See Also: /dumpdir/server1/af.425ba6f Thread ID 61 will NOT be suspended because it is deemed too critical to the server. See Also: /dumpdir/server1/af.425ba6f Stack for thread: 61 CDRGeval0 afstack mt_ex_throw_sig afsig_handler <signal frame> ucvdrop ucvreset flfree opfree rsclose cdrExpandRow grouperCopy grouperEvalThread cdrTrampolineThread th_init_initgls startup Recovery from this situation requires the server to be restarted without Enterprise Replication and then the associated replicate is made inactive. It may then be dropped and recreated followed by a data resync activity to ensure all necessary data has been replicated to the target table.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: * * Users of Informix Server prior to 12.10.xC15 and 14.10.xC6. * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to Informix Server 12.10.xC15 (when available) or * * 14.10.xC6 (when available). * ****************************************************************
Problem conclusion
Fixed in Informix Server 12.10.xC15 and 14.10.xC6.
Temporary fix
Comments
APAR Information
APAR number
IT34933
Reported component name
INFORMIX SERVER
Reported component ID
5725A3900
Reported release
E10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-11-13
Closed date
2021-05-18
Last modified date
2024-09-24
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
INFORMIX SERVER
Fixed component ID
5725A3900
Applicable component levels
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"E10","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
Document Information
Modified date:
25 September 2024