RE: Segmentation fault problem

 
Miljen, I think your code snippet is trying to access a memory location that it is not allowed to access. For e.g. you might be writing some illegal location using some pointer (may be one of them my_test,my_test2). Try changing the HANDLER_CAN_RWRITE in the declaration portion to HANDLER_CAN_READ (in both). Your pointers might be trying to access eachothers location. 
 
Hope it helps!
Regards,
Syed Mujtaba

Date: Fri, 11 Jul 2008 15:52:31 +0200From: [email protected]: [email protected]: Segmentation fault problemHi everyone,I am trying to add SNMP support in the IKEv2 project (http://sourceforge.net/projects/ikev2) and I am using net-snmp, 5.4.1.Firstly, there is a great number of variables which I plan to register. I am wondering whether is possible (or harmful) to use one oid variable as:oid session_oid[] = {.., 13, 1};and then change last element of this array (to 2,3,..etc.) before registering different variables? The alternative is to declare and use different oid array for each variable that I want to register.More importantly, there is a problem which gives me a headache - a segmentation fault occasionally happens. Here is a backtrace:(gdb) bt#0  0x080fc3e1 in snmp_sess_timeout ()#1  0x080fc579 in snmp_timeout ()#2  0x080d8cb5 in snmp_synch_response_cb ()#3  0x080c9f57 in agentx_synch_response ()#4  0x080ca702 in agentx_register ()#5  0x080ba735 in agentx_registration_callback ()#6  0x0811c0c9 in snmp_call_callbacks ()#7  0x080ab5b2 in netsnmp_register_mib ()#8  0x080b04cd in netsnmp_register_handler ()#9  0x080793aa in sm_sessions_register () at sm.c:441#10 0x0807e93f in sm_main_thread (data=0xbfd33c28) at sm.c:7778#11 0x00c1a8ef in g_thread_create_full () from /usr/lib/libglib-2.0.so.0#12 0x001b53b6 in start_thread () from /lib/libpthread.so.0#13 0x00b2933e in clone () from /lib/libc.so.6Function sm_sessions_register() is defined as:void sm_sessions_register(){         netsnmp_handler_registration *my_test;        netsnmp_handler_registration *my_test2;        my_test =               netsnmp_create_handler_registration("example",
                                                sm_sess_handle,                                                session_oid,                                                OID_LENGTH(session_oid),                                                HANDLER_CAN_RWRITE);        netsnmp_register_instance(my_test); // --> THIS IS LINE 441!        my_test2 =                netsnmp_create_handler_registration("example2",                                                sm_sess_handle,                                                session_oid2,                                                OID_LENGTH(session_oid2),                                                HANDLER_CAN_RWRITE);        netsnmp_register_instance(my_test2);}session_oid and session_oid2 are defined as:oid session_oid[] = { 1, 3, 6, 1, 3, 411249, 13, 2, 1 };oid session_oid2[] = { 1, 3, 6, 1, 3, 411249, 13, 2, 2 };and they are globals. Sm_sess_handle is written by example in your tutorial (delayed_instance.c) and I can include this code also if necessary.I would be very grateful for any help or hint!Miljen
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