[pysnmp-users] PYSNMP crash in _com2sec with TypeError: __hash__() should return an int

[Abhishek L. <lah...@gm...>]

Hi,

My SNMP packages uses pysnmp for both sending /receiving SNMP queries and
accept SNMP traps. However it seems to fail continuously after running
successfully for some time. From the log I see :

2015-11-21 02:57:16,155 [8995] ERROR: SNMP Error:poll error: Traceback
(most recent call last):
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/carrier/asynsock/dispatch.py",
line 37, in runDispatcher
    use_poll=True, map=self.__sockMap, count=1)
;  File "/usr/lib64/python2.6/asyncore.py", line 214, in loop
    poll_fun(timeout, map)
;  File "/usr/lib64/python2.6/asyncore.py", line 195, in poll2
    readwrite(obj, flags)
;  File "/usr/lib64/python2.6/asyncore.py", line 119, in readwrite
    obj.handle_error()
;  File "/usr/lib64/python2.6/asyncore.py", line 103, in readwrite
    obj.handle_read_event()
;  File "/usr/lib64/python2.6/asyncore.py", line 428, in handle_read_event
    self.handle_read()
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/carrier/asynsock/dgram/base.py",
line 83, in handle_read
    self._cbFun(self, transportAddress, incomingMessage)
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/carrier/base.py",
line 52, in _cbFun
    self, transportDomain, transportAddress, incomingMessage
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/entity/engine.py",
line 64, in __receiveMessageCbFun
    self, transportDomain, transportAddress, wholeMsg
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/proto/rfc3412.py",
line 319, in receiveMessage
    wholeMsg
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/proto/mpmod/rfc2576.py",
line 276, in prepareDataElements
    msg
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/proto/secmod/rfc2576.py",
line 398, in processIncomingMsg
    snmpEngine, communityName, transportInformation
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/proto/secmod/rfc2576.py",
line 260, in _com2sec
    if _tagAndCommunity not in self.__tagAndCommunityToSecurityMap:
;TypeError: __hash__() should return an int
.
Traceback (most recent call last):
  File
"/opt/mysnmp-package/lib/python2.6/site-packages/automationtools_probe/monitoring_agent.py",
line 69, in checkEvent
    lookupNames=True, lookupValues=True)
  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/entity/rfc3413/oneliner/cmdgen.py",
line 541, in nextCmd
    self.__asynCmdGen.snmpEngine.transportDispatcher.runDispatcher()
  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/carrier/asynsock/dispatch.py",
line 41, in runDispatcher
    raise PySnmpError('poll error: %s' %
';'.join(format_exception(*exc_info())))
PySnmpError: poll error: Traceback (most recent call last):
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/carrier/asynsock/dispatch.py",
line 37, in runDispatcher
    use_poll=True, map=self.__sockMap, count=1)
;  File "/usr/lib64/python2.6/asyncore.py", line 214, in loop
    poll_fun(timeout, map)
;  File "/usr/lib64/python2.6/asyncore.py", line 195, in poll2
    readwrite(obj, flags)
;  File "/usr/lib64/python2.6/asyncore.py", line 119, in readwrite
    obj.handle_error()
;  File "/usr/lib64/python2.6/asyncore.py", line 103, in readwrite
    obj.handle_read_event()
;  File "/usr/lib64/python2.6/asyncore.py", line 428, in handle_read_event
    self.handle_read()
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/carrier/asynsock/dgram/base.py",
line 83, in handle_read
    self._cbFun(self, transportAddress, incomingMessage)
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/carrier/base.py",
line 52, in _cbFun
    self, transportDomain, transportAddress, incomingMessage
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/entity/engine.py",
line 64, in __receiveMessageCbFun
    self, transportDomain, transportAddress, wholeMsg
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/proto/rfc3412.py",
line 319, in receiveMessage
    wholeMsg
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/proto/mpmod/rfc2576.py",
line 276, in prepareDataElements
    msg
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/proto/secmod/rfc2576.py",
line 398, in processIncomingMsg
    snmpEngine, communityName, transportInformation
;  File
"/opt/mysnmp-package/lib/python2.6/site-packages/pysnmp/proto/secmod/rfc2576.py",
line 260, in _com2sec
    if _tagAndCommunity not in self.__tagAndCommunityToSecurityMap:
;TypeError: __hash__() should return an int


If I turn on pysnmp debug I see the following. Looks like a null or empty
community string is somehow getting populated but not sure how and if that
is causing it to crash,

tagAndCommunity (SnmpTagValue(''), OctetString('Secr3tPass')) targetaddress
MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1, 3), TAddress())
tagAndCommunity (SnmpTagValue(''), OctetString('Secr3tPass')) targetaddress
MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1, 3), TAddress())
tagAndCommunity (SnmpTagValue(''), OctetString('Secr3tPass')) targetaddress
MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1, 3), TAddress())
tagAndCommunity (SnmpTagValue(''), OctetString('Secr3tPass')) targetaddress
MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1, 3), TAddress())
tagAndCommunity (SnmpTagValue(''), OctetString()) targetaddress
MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1, 3), TAddress())
Error __hash__() should return an int tagAndCommunity (SnmpTagValue(''),
OctetString()) targetaddress MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1,
3), TAddress())
tagAndCommunity (SnmpTagValue(''), OctetString()) targetaddress
MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1, 3), TAddress())
Error __hash__() should return an int tagAndCommunity (SnmpTagValue(''),
OctetString()) targetaddress MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1,
3), TAddress())
tagAndCommunity (SnmpTagValue(''), OctetString()) targetaddress
MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1, 3), TAddress())
Error __hash__() should return an int tagAndCommunity (SnmpTagValue(''),
OctetString()) targetaddress MibTableColumn((1, 3, 6, 1, 6, 3, 12, 1, 2, 1,
3), TAddress())

TIA