rare crash with

Hello,

I'm using Debian squeeze 64bit with snmpd 5.4.3~dfsg-2.

On this system I'm running several Cyrus IMAP server instances.  Every 
cyrus instances is started to connect to a snmp agentx:

snmp      7292  0.0  0.0  51596  4096 ?        S    Jul15  10:38 
/usr/sbin/snmpd -Lsd -Lf /dev/null -u snmp -I -smux -p 
/var/run/snmpd-mail20.pid -x /var/agentx/mail20 --agentxperms=775 755 
root mail tcp:mail20.ugent.be

The cyrus imap daemon's master process is (well was) configured to 
connect to /var/agentx/mail[number]

 From time to time my cyrus master process vanishes!  This leaves the 
service unavailable.

I have looked at this with a cyrus developper and looking at the 
backtrace we see that the problem lies in the integration with snmp.

(gdb) bt
#0  0x00007f4a56cd6013 in sendto () from /lib/libc.so.6
#1  0x00007f4a5868b1ae in ?? () from /usr/lib/libnetsnmp.so.15
#2  0x00007f4a5865ae6a in snmp_sess_async_send () from 
/usr/lib/libnetsnmp.so.15
#3  0x00007f4a58634c97 in snmp_synch_response_cb () from 
/usr/lib/libnetsnmp.so.15
#4  0x00007f4a58e8add7 in agentx_send_ping () from 
/usr/lib/libnetsnmpagent.so.15
#5  0x00007f4a58e7a889 in agentx_check_session () from 
/usr/lib/libnetsnmpagent.so.15
#6  0x00007f4a5867c4a4 in run_alarms () from /usr/lib/libnetsnmp.so.15
#7  0x0000000000408999 in main (argc=<value optimized out>, argv=<value 
optimized out>) at master.c:2221

You can find the source on
http://git.cyrusimap.org/cyrus-imapd/tree/master/master.c?id=cyrus-imapd-2.4.10

The only thing else I can tell is that the crash happens very randomly. 
  I can't see any pattern.

I would appreciate any help to further debug this. As we don't have any 
snmp statistics for the time being.

Rudy

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