Down of instance Informix

Hi: For minutes, me key instance INFORMIX. Log indicates the following thing to me 10:13:43 Logical Log 47158 Complete. 10:13:52 Logical Log 47158 - Backup Started 10:14:35 Logical Log 47158 - Backup Completed 10:15:58 Assert Failed: No Exception Handler 10:15:58 IBM Informix Dynamic Server Version 7.31.FD8 10:15:58 Who: Session(9812455, nazca@ac1e3375, 1324, -262759576) Thread(10603400, sqlexec, c0000000e4c881a8, 1) File: mtex.c Line: 471 10:15:58 Results: Exception Caught. Type: MT_EX_OS, Context: mem 10:15:58 Action: Please notify IBM Informix Technical Support. 10:15:58 stack trace for pid 7623 written to /tmp/af.cf70c82d 10:16:28 See Also: /tmp/af.cf70c82d 10:16:28 mtex.c, line 471, thread 10603400, proc id 7623, No Exception Handler. 10:16:28 PANIC: Attempting to bring system down they can help me in knowing the CAUSE the problem so that it allows me to take remedial actions and preventive measures. Thank you very much Greetings DATE: Informix 7.31 FD8 Hp-UX 11.11

10:15:58 IBM Informix Dynamic Server Version 7.31.FD8 10:15:58 Who: Session(9812455, nazca@ac1e3375, 1324, -262759576) Thread(10603400, sqlexec, c0000000e4c881a8, 1) File: mtex.c Line: 471 10:15:58 Results: Exception Caught. Type: MT_EX_OS, Context: mem 10:15:58 Action: Please notify IBM Informix Technical Support. Time to dust off your support contract and follow the advice given in the log file