I am running net-snmp 5.4.2.1
Have a subagent sending traps to the master snmpd daemon.
After about (depending on the size of trap buffer) 200 or 500 traps,
either the subagent and snmpd deadlock in sendto or
subagent receives a SIGPIPE.
Observations:
1. The core problem is that snmpd agent doesn't seem to drain it's recvQ
(using tcp:localhost:705)
2. If the subagent is implemented as a library call, there is no way to
clean up the session and reinit.
The following sequence doesn't seem to work
init_agent
init_snmp(daemon_name);
..
// Lets say inorder to avoid the deadlock, I will close the session(subagent)
after sending x traps and reinit
snmp_shutdown(daemon_name);
shutdown_agent();
// Reinit
Init_agent
Init_snmp
I have read through all the forum posts, but didn't find any solution.
I did read that 5.7.2 does resolve the SIGPIPE, unfortunately I cannot risk
snmp hijacking SIGPIPE since the daemon sending the traps needs to handle this
signal for other reasons. Besides that, I have also read that 5.7.2 doesn't
solve the deadlock (main cause the recvQ on the snmpd socket doesn't get
drained)
Appreciate any help or insights into this.
Thanks,
-Usha
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