Assertion Failure Message

I am constantly having problems with my informix ver 7.2 database on HP-UX 10.2 which is constantly hanging and gives the following error message in the log file. and dumps the file shmem.101c9b.1 in /tmp. After this the whole system becomes slow and for it to be fast you remove this file but in some cases the database goes down. I tried to use stream pipes but the database could not come up. What is the problem? online .log logs this message. 08:27:26 Process exited with return code 139: /bin/sh /bin/sh -c /u/informix/et c/log_full.sh 2 23 "Logical Log 2051 Complete." "Logical Log 2051 Complete." 08:27:28 Logical Log 2051 - Backup Completed 08:28:45 Logical Log 2052 Complete. 08:28:46 Process exited with return code 139: /bin/sh /bin/sh -c /u/informix/et c/log_full.sh 2 23 "Logical Log 2052 Complete." "Logical Log 2052 Complete." 08:28:49 Logical Log 2052 - Backup Started 08:28:54 Logical Log 2052 - Backup Completed 08:31:43 Assert Failed: Memory free block header corruption detected inmt_shm_malloc_segid 1 08:31:43 Informix Dynamic Server Version 7.30.UC3 08:31:43 Who: Session(90417, informix@, 0, 0) Thread(17, soctcplst, 0, 1) File: mtshpool.c Line: 2562 08:31:43 Results: Pool repaired 08:31:43Action: Please notify Informix Technical Support. 08:32:02 Checkpoint Completed: duration was 32 seconds. 08:32:32 Logical Log 2053 Complete. 08:32:36 Logical Log 2053 - Backup Started 08:32:41 Logical Log 2053 - Backup Completed 08:34:13 See Also: /tmp/af.11058c, shmem.11058c.11 08:34:13 Error writing '/tmp/shmem.11058c.11' errno = 28 @ my config file is set up as follows. ROOTNAME rootdbs # Root dbspace name ROOTPATH /dev/rdsk/c1t12d0 # Path for device containing root dbspace ROOTOFFSET 0 # Offset of root dbspace into device (Kbytes) ROOTSIZE 500000 # Size of root dbspace (Kbytes) # Disk Mirroring Configuration Parameters MIRROR 0 # Mirroring flag (Yes = 1, No = 0) MIRRORPATH # Path for device containing mirrored root MIRROROFFSET 0 # Offset into mirrored device (Kbytes)PHYSDBS logsdbs # Location (dbspace) of physical log PHYSFILE 250000 # Physical log file size (Kbytes) # Logical Log Configuration LOGFILES 32 # Number of logical log files LOGSIZE 5000 # Logical log size (Kbytes) # Diagnostics MSGPATH /u/informix/online.log # System message log file path CONSOLE /dev/console # System console message path ALARMPROGRAM /u/informix/etc/log_full.sh # Alarm program pathSYSALARMPROGRAM /u/informix/etc/evidence.sh # System Alarm program path TBLSPACE_STATS 1 # System Archive Tape Device TAPEDEV /dev/rmt/1m # Tape device path TAPEBLK 1024 # Tape block size(Kbytes) TAPESIZE 12000000 # Maximum amount of data to put on tape (Kbytes) # Log Archive Tape Device LTAPEDEV /dev/rmt/2m # Log tape device path LTAPEBLK 1024 # Log tapeblock size (Kbytes) LTAPESIZE 4000000 # Max amount of data to put on log tape (Kbytes) # Optical STAGEBLOB # Informix Dynamic Server/Optical staging area # System Configuration SERVERNUM 1 # Unique id corresponding to a Dynamic Server in stance DBSERVERNAME ok_srvr # Name of default database server DBSERVERALIASESok_tcp # List of alternate dbservernames #DBSERVERALIASES ok_tcp,ok_str # List of alternate dbservernames NETTYPE ipcshm,2,150,NET # Configure poll thread(s) for nettype NETTYPE soctcp,2,200,NET # Configure poll thread(s) for nettype #NETTYPE ipcstr,2,200,NET # Configure poll thread(s) for nettype DEADLOCK_TIMEOUT 60 # Max time to wait of lock in distributed env. RESIDENT 1 # Forced residency flag (Yes = 1, No = 0) MULTIPROCESSOR 1 # 0 forsingle-processor, 1 for multi-processor NUMCPUVPS 2 # Number of user (cpu) vps SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one NOAGE 1 # Process aging AFF_SPROC 0 # Affinity start processor AFF_NPROCS 0 # Affinity number of processors # Shared Memory Parameters LOCKS 700000 # Maximum number of locks BUFFERS 15000 # Maximum number ofshared buffers NUMAIOVPS # Number of IO vps PHYSBUFF 128 # Physical log buffer size (Kbytes) LOGBUFF 128 # Logical log buffer size (Kbytes) LOGSMAX 100 # Maximum number of logical log files CLEANERS 8 # Number of buffer cleaner processes SHMBASE 0x0 # Shared memory base address SHMVIRTSIZE 100000 # initial virtual shared memory segment size SHMADD 40000 # Size of new shared memory segments (Kbytes) SHMTOTAL 0 # Total shared memory (Kbytes). 0=>unlimited CKPTINTVL 300 # Check point interval (in sec) LRUS 8 # Number of LRU queuesLRUS 8 # Number of LRU queues LRU_MAX_DIRTY 5 # LRU percent dirty begin cleaning limit LRU_MIN_DIRTY 1 # LRU percent dirty end cleaning limit LTXHWM 50 # Long transaction high water mark percentage LTXEHWM 60 # Long transaction high water mark (exclusive) TXTIMEOUT 0x12c # Transaction timeout (in sec) STACKSIZE 32 # Stack size (Kbytes) # System Page Size # BUFFSIZE - Dynamic Server no longer supports this configuration parameter. # To determine the page size used by Dynamic Server on your platform # see the last line of output from the command, 'onstat -b'. # Recovery Variables # OFF_RECVRY_THREADS: # Number of parallel worker threads during fast recovery or an offline restore. # ON_RECVRY_THREADS: # Number of parallel worker threads during an online restore. OFF_RECVRY_THREADS 10 # Default number of offline worker threads ON_RECVRY_THREADS 5 # Default number of online worker threads DRAUTO 0 #DR automatic switchover DRINTERVAL 30 # DR max time between DR buffer flushes (in sec) DRTIMEOUT 30 # DR network timeout (in sec) DRLOSTFOUND /u/informix/etc/dr.lostfound # DR lost+found file path # CDR Variables CDR_LOGBUFFERS 2048 # size of log reading buffer pool (Kbytes) CDR_EVALTHREADS 1,2 # evaluator threads (per-cpu-vp,additional) CDR_DSLOCKWAIT 5 # DS lockwait timeout (seconds) CDR_QUEUEMEM 4096 #Maximum amount of memory for any CDR queue (Kb ytes) # Backup/Restore variables BAR_ACT_LOG /tmp/bar_act.log BAR_MAX_BACKUP 0 BAR_RETRY 1 BAR_NB_XPORT_COUNT 10 BAR_XFER_BUF_SIZE 31 # Informix Storage Manager variables ISM_DATA_POOL ISMData # If the data pool name is changed, be sure to # Read Ahead Variables RA_PAGES 512 # Number of pages to attempt to read ahead RA_THRESHOLD # Number of pages left before next group # # Parallel Database Queries (pdq) MAX_PDQPRIORITY 100 # Maximum allowed pdqpriority DS_MAX_QUERIES # Maximum number of decision support queries DS_TOTAL_MEMORY # Decision support memory (Kbytes) DS_MAX_SCANS 1048576 # Maximum number of decision support scans DATASKIPoff # List of dbspaces to skip # HETERO_COMMIT (Gateway participation in distributed transactions) # 1 => Heterogeneous Commit is enabled # 0 (or any other value) => Heterogeneous Commit is disabled HETERO_COMMIT 0 # Optimization goal: -1 = ALL_ROWS(Default), 0 = FIRST_ROWS OPT_GOAL -1 @@