How to explain the crash? - Informix IDS 7.30 UC8

Our IDS 7.30 UC8 running on Solaris 2.6 crashed on production under heavy activities(about 2500 userthreads). Here's what the online.log and AF file says: 14:33:58 Who: Session(67858, txw10902@dfsun40, 15214, 0) Thread(81152, sqlexec, 0, 15) File: mtex.c Line: 314 14:33:58 Results: Exception Caught. Type: MT_EX_OS, Context: mem 14:33:58 Action: Please notify Informix Technical Support. 14:34:24 Logical Log 309901 Complete. 14:34:28 Logical Log 309901 - Backup Started 14:34:35 See Also: /production/crash/af.bcb8f246, shmem.bcb8f246.0 14:34:51 See Also: /production/crash/af.bb98f250, shmem.bb98f250.0 14:34:52 See Also: /production/crash/af.c347f23c, shmem.c347f23c.0 14:35:28 See Also: /production/crash/af.bd08f248, shmem.bd08f248.0 14:36:26 See Also: /production/crash/af.3d00f2a5, shmem.3d00f2a5.0 14:37:13 See Also: /production/crash/af.c041f28d, shmem.c041f28d.0 14:37:56 AsserT Failed: No Exception Handler 14:37:56 Informix Dynamic Server Version 7.30.UC8 14:37:56 Who: Session(98620, txw31010@dfsun40, 20818, 0) Thread(118569, sqlexec, 0, 13) File: mtex.c Line: 314 14:37:56 Results: Exception Caught. Type: MT_EX_OS, Context: mem 14:37:56 Action: Please notify Informix Technical Support. 14:41:32 See Also: /production/crash/af.cf29f392, shmem.cf29f392.0 I checked Informix's product defect database and found defect 111839 has very similar symptom. Anyone know if we've a fix for this? This session was running a 'EXECUTE PROCEDURE' from the frontend VB application. And the trace/debug was turned on for this procedure. My question is if turning on trace for procedure has anything to do with the engine crash or has a performance hit? Here I also pasted the stack for the thread: ===========------------- - - - - - - /opt/informix/bin/onstat -g stk 81152 light: Informix Dynamic Server Version 7.30.UC8 -- On-Line -- Up 1 days 22:19:52 -- 1328720 K bytes Stack for thread: 81152 sqlexecbase: 0x3245e630 len: 41472 pc: 0x004178ac tos: 0x32467568 state: running vp: 15 0x00436afc (oninit)afhandler(0x3d00f2a5, 0x6159d0, 0x1, 0x0, 0x1, 0x5dd0ac) 0x00436564 (oninit)afcrash_interface(0x6159d0, 0x32467d48, 0x2da657a0, 0x6159e8, 0x13a, 0 x0) 0x00439b30 (oninit)mt_ex_throw_sig(0x1, 0x5ec8c0, 0x5e6d18, 0x4, 0x1fb6ec04, 0x0) 0xef5388ec (***nosymtab***)0xef5388ec(0xb, 0x0, 0x32467f08, 0x37b82018, 0xb, 0x0) 0x001dde9c (oninit)extend_trace(0x1e189840, 0xb, 0x37b82018, 0x1e4cc788, 0x20000, 0x1) 0x001db558 (oninit)elist_trace(0x1e1898a8, 0x1ca28f90, 0xfffffffc, 0xa0000, 0x0, 0x1) 0x001d96ec (oninit)trace_expr(0x1e1898c8, 0x17, 0x324683d0, 0x1e1899a8, 0x0, 0x57) 0x001d1fd0 (oninit)ip_evalexpr(0x1e1898c8, 0x0, 0x1e4cc438, 0x0, 0x1e4cc430, 0x0) 0x001d13f0 (oninit)runproc (0x0, 0x0, 0x109c, 0x21e9573c, 0x2be50664, 0x21bbc118) 0x001d6b9c (oninit)ip_curnext(0xffffffff, 0x4f, 0x2b97ee18, 0x32468568, 0x0, 0x32468564) 0x001d6a1c (oninit)ip_fetch(0x2b97e030, 0x38, 0x2928f6a0, 0x2928f71c, 0x2928f8e4, 0x25460 8e0) 0x000cf058 (oninit)getrow (0x2b97e030, 0x0, 0x10000000, 0x38, 0x2b97eb08, 0x32468766) 0x000cef1c (oninit)fetchrow(0x2b97e030, 0x258ad690, 0x26334118, 0x2, 0x0, 0x388) 0x001a28e4 (oninit)exfetch (0x2b97e030, 0x2, 0x0, 0x37, 0x39, 0x26335c54) 0x001775b8 (oninit)sq_nfetch(0x1000, 0x0, 0x0, 0x2b97e030, 0x1000, 0x0) 0x00188dd4 (oninit)sqmain (0x646d20, 0x9, 0x64f914, 0x655800, 0x63dce0, 0x0) 0x004199d4 (oninit)startup (0x646d84, 0x0, 0x1c99e908, 0x1c99e908, 0x655800, 0x646c00) 0x00413750 (oninit)mt_poll_yield(0x0, 0x0, 0x0, 0x0, 0x0, 0x0) 0x00000000 (***nosymtab***)0x0 Thank you so much to share! Dong _______________________________________________________________ Get Free Email and Do More On The Web. Visit http://www.msn.com