Valgrind reports Invalid read in subagent
Bradley Kite <[email protected]>
| Newsgroups | gmane.network.net-snmp.user |
|---|---|
| Message-ID | <CA+JxU+4AYJtV+GeXh8ft8hVEb_iOdPbh47+YK_AgomfACDgMQw@mail.gmail.com> |
Hi, I am testing/debugging a network application heap corruption bug (the application is also an AgentX subagent), and valgrind is reporting this error - which I suspect might be the cause of the problem: ==5608== Thread 9: ==5608== Invalid read of size 8 ==5608== at 0x4CFF13: handle_subagent_response (subagent.c:550) ==5608== by 0x4FB8E3: _sess_process_packet (snmp_api.c:5518) ==5608== by 0x4FCFC0: _sess_read (snmp_api.c:6043) ==5608== by 0x4FDCA8: snmp_sess_read2 (snmp_api.c:6075) ==5608== by 0x4FDD42: snmp_read2 (snmp_api.c:5667) ==5608== by 0x4C142A: agent_check_and_process (snmp_agent.c:668) ==5608== by 0x47AE95: snmp_loop(void*) (authent.cpp:1609) ==5608== by 0x3095007D13: start_thread (in /usr/lib64/libpthread-2.15.so) ==5608== by 0x30948F167C: clone (in /usr/lib64/libc-2.15.so) ==5608== Address 0x4e24c00 is 0 bytes inside a block of size 408 free'd ==5608== at 0x4A079AE: free (vg_replace_malloc.c:427) ==5608== by 0x4F7877: snmp_sess_close (snmp_api.c:2047) ==5608== by 0x4F7D62: snmp_sess_select_info2 (snmp_api.c:6207) ==5608== by 0x4C13EF: agent_check_and_process (snmp_agent.c:638) ==5608== by 0x47AE95: snmp_loop(void*) (authent.cpp:1609) ==5608== by 0x3095007D13: start_thread (in /usr/lib64/libpthread-2.15.so) ==5608== by 0x30948F167C: clone (in /usr/lib64/libc-2.15.so) I am able to reliably reproduce this by rapidly querying the agent, then restarting the snmpd service on the host, which suggests that the problem occurs when the subagent looses its connection to the master. Any help in fixing this would be greatly appreciated. Regards -- Brad. ------------------------------------------------------------------------------ Don't let slow site performance ruin your business. Deploy New Relic APM Deploy New Relic app performance management and know exactly what is happening inside your Ruby, Python, PHP, Java, and .NET app Try New Relic at no cost today and get our sweet Data Nerd shirt too! http://p.sf.net/sfu/newrelic-dev2dev _______________________________________________ Net-snmp-users mailing list [email protected] Please see the following page to unsubscribe or change other options: https://lists.sourceforge.net/lists/listinfo/net-snmp-users