(unknown)

Hi Dave,

 

I have written a subagent. Sometimes which works fine but sometimes it
stucks and snmpwalk returns with time out. I have taken the back trace
of stack when it works fine and when it does not work fine as below. I
am using net-snmp code.

 

When it works find

 

Thread 6 (Thread 0x7f491b0bd950 (LWP 19287)):

#0  0x00007f4918eab642 in select () from /lib64/libc.so.6

#1  0x000000000044abe3 in GisSnmpThreadProcedure (arg=0x0) at
gis_snmp.c:82

#2  0x00000000004d63c1 in ThreadFn (arg1=0xec8790) at
/repos/harendra/iserver_6_0_0_0_d18/common/thutils.c:285

#3  0x00007f4919f14070 in start_thread () from /lib64/libpthread.so.0

#4  0x00007f4918eb20ed in clone () from /lib64/libc.so.6

#5  0x0000000000000000 in ?? ()

 

When it gets stuck

 

Thread 6 (Thread 0x7f4f6940b950 (LWP 17138)):

#0  0x00007f4f6826887b in read () from /lib64/libpthread.so.0

#1  0x000000000056b280 in netsnmp_callback_recv (t=<value optimized
out>, buf=<value optimized out>, size=<value optimized out>,
opaque=0x7f4f6940a6f8,

    olength=0x7f4f6940a704) at snmpCallbackDomain.c:194

#2  0x0000000000542447 in _sess_read (sessp=0xeec760,
fdset=0x7f4f6940abd0) at snmp_api.c:5544

#3  0x00000000005431e9 in snmp_sess_read (sessp=0xb,
fdset=0x7f4f6940a69f) at snmp_api.c:5761

#4  0x0000000000543223 in snmp_read (fdset=0x7f4f6940abd0) at
snmp_api.c:5378

#5  0x00000000004ede02 in nx_subagent_agentx_process
(read_setp=0x7f4f6940abd0) at
/repos/harendra/iserver_6_0_0_0_d18/common/nx_subagent.c:103

#6  0x000000000044abef in GisSnmpThreadProcedure (arg=0x0) at
gis_snmp.c:88

#7  0x00000000004d63c1 in ThreadFn (arg1=0xec8790) at
/repos/harendra/iserver_6_0_0_0_d18/common/thutils.c:285

#8  0x00007f4f68262070 in start_thread () from /lib64/libpthread.so.0

#9  0x00007f4f672000ed in clone () from /lib64/libc.so.6

#10 0x0000000000000000 in ?? ()

 

 

This is my piece of code.

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

void *

GisSnmpThreadProcedure (void *arg)

{

    fd_set read_set = { 0 };

    int maxfds = 0;

    struct timeval agentx_timeout = { 0 };

 

    NETERROR (MGISA, ("thread harendra - running\n"));

    /* Initialize the AgentX/SNMP library. */

    if (nx_subagent_agentx_init ("GISSubagent", "/var/log/gis_sa.log")
!=

                    NX_SUBAGENT_SUCCESS)

    {

            NETERROR (MGISA, ("thread harendra 0- running\n"));

            return NULL;

    }

    init_sipCommonMIB ();

    NETERROR (MGISA, ("thread harendra 2- running\n"));

 

    while (1)

    {

        FD_ZERO (&read_set);

 

        /* Get the AgentX timeout and add the AgentX socket

         * descriptor to the read set.

         */

        nx_subagent_agentx_select (&read_set, &agentx_timeout, &maxfds);

        maxfds += 1;

        if (select (maxfds, &read_set, NULL, NULL, &agentx_timeout) < 0)

        {

            /* Error in select. */

        }

 

        /* Process AgentX messages */

        nx_subagent_agentx_process (&read_set);

    }

    return NULL;

}

 

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++

 

Thanks,

Harendra

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