snmp_synch_response() hanging

On a particular RADIUS module, in order to authenticate the user, I 
have to make a certain check against a CISCO 2950 switch, which 
involves browsing a certain subtree.

The code does, at a point:

pdu= snmp_pdu_create(SNMP_MSG_GETNEXT);
snmp_add_null_var(pdu, OID, OID_len);
status= snmp_synch_response(s, pdu, &response);

I start seeing the number of RADIUS threads increasing without bound. 
Attaching a debugger, I get that threads are stuck there for many 
minutes, even hours:

201              status= snmp_synch_response(s, pdu, &response);
(gdb) print s
$1 = (struct snmp_session *) 0x552af72240
(gdb) print *s
$2 = {version = 0, retries = 5, timeout = 1000000, flags = 0, 
subsession = 0x0, next = 0x0,
  peername = 0x552af42ee0 "XXXXXXXX", remote_port = 0, localname = 
0x0, local_port = 0,
  authenticator = 0, callback = 0x2a97b25700 <snmp_synch_input>, 
callback_magic = 0x4960be10,
  s_errno = 0, s_snmp_errno = 0, sessid = 136, community = 
0x552af6f590 "XXXXXXXX@12",
  community_len = 14, rcvMsgMaxSize = 65507, sndMsgMaxSize = 0, 
isAuthoritative = 0 '\0',
  contextEngineID = 0x0, contextEngineIDLen = 0, engineBoots = 0, 
engineTime = 0,
  contextName = 0x552af18880 "", contextNameLen = 0, securityEngineID 
= 0x0,
  securityEngineIDLen = 0, securityName = 0x0, securityNameLen = 0,
  securityAuthProto = 0x552af72580, securityAuthProtoLen = 10,
  securityAuthKey = '\0' <repeats 31 times>, securityAuthKeyLen = 0, 
securityAuthLocalKey = 0x0,
  securityAuthLocalKeyLen = 0, securityPrivProto = 0x552af49580, 
securityPrivProtoLen = 10,
  securityPrivKey = '\0' <repeats 31 times>, securityPrivKeyLen = 0, 
securityPrivLocalKey = 0x0,
  securityPrivLocalKeyLen = 0, securityModel = 3, securityLevel = 1, 
securityInfo = 0x0,
  myvoid = 0x0}

It doesn't happen all the time. Some threads do get stuck, some don't, 
following no evident pattern. My understanding was the timeout should 
handle this. Was I wrong? Should I use separate timers?

This is Red Hat Enterprise Linux AS release 4 (2.6.9-42.ELsmp) with 
net-snmp-libs-5.1.2-11.EL4.7. Should I upgrade Net-SNMP or the 
problem might be somewhere else?

Thanks!

Fernando.

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