Hello,
Could you please help me regarding this problem.
When I am sending continuous flow if snmp traffic (packets/queries) the process
SNMPd is getting unresponsive after some time and we are restarting it. But
after some 30-35 restarts the AgentX is getting blocked in at the call :
agent_check_and_process(Operation::AGENTX_BLOCK_TILL_SNMP_PACKET_ARRIVE);
Inside which its getting blocked at the write system call writing to a pipe
inside netsnmp_callback_send.
The stack trace at the time of the block is as below:
/lib/libpthread.so.0(__write+0x38)[0xfaa17e4]
/pkg/net-snmp/lib/libnetsnmp.so.15(netsnmp_callback_send+0x3e0)[0xfd98318]
/pkg/net-snmp/lib/libnetsnmp.so.15(snmp_sess_async_send+0x4a0)[0xfd61f58]
/pkg/net-snmp/lib/libnetsnmp.so.15(snmp_async_send+0x3c)[0xfd624d4]
/pkg/net-snmp/lib/libnetsnmpagent.so.15(handle_agentx_packet+0x504)[0xfe5f9e0]
/pkg/net-snmp/lib/libnetsnmp.so.15[0xfd64d40]
/pkg/net-snmp/lib/libnetsnmp.so.15(_sess_read+0x220)[0xfd6644c]
/pkg/net-snmp/lib/libnetsnmp.so.15(snmp_sess_read+0x2c)[0xfd67140]
/pkg/net-snmp/lib/libnetsnmp.so.15(snmp_read+0x48)[0xfd671c4]
/pkg/net-snmp/lib/libnetsnmpagent.so.15(agent_check_and_process+0xc4)[0xfe4fc18]
In the function netsnmp_callback_recv we are reading from the same pipe.
Also from debug log I have noticed that we have far more calls to write to the
pipe that the reads from the pipe. So is it that the pipe is getting full as we
are reading less than the write operation, and causing the last write to block?
How to handle this situation?
Please advise.
Thanks and regards
S Sarath
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