SystemError: <built-in function walk> returned NULL without setting an error (3.7)

[lroellin]

When running on an non-existing device with version 0.2.5:

try:
    snmp_walk(base_oid_id, hostname=ip_address_.compressed, community=snmp_v2_community, version=2)
except EasySNMPError as e:
    raise SnmpV2Exception(str(e))

I get SystemError: <built-in function walk> returned NULL without setting an error

When running with Python 3.6.6, I get the expected behavior (raised EasySNMPError)

[andy-shady-org]

Hi, I am also seeing this error when using easysnmp within the get call:

reply = self.snmp.get(snmp_oid)

File "/Users/andy/projects/venv-python37/lib/python3.7/site-packages/easysnmp-0.2.5-py3.7-macosx-10.13-x86_64.egg/easysnmp/session.py", line 315, in get
interface.get(self, varlist)
SystemError: returned NULL without setting an error
DEBUG:web2py.app.onboard:{'error': ' returned NULL without setting an error'}

easysnmp==0.2.5

[henry-feng]

I have the same failure for python 3.7, @andy-shady-org @lroellin would you like to share your fix of this bug? thanks

[lroellin]

I have no fix currently other than to downgrade to 3.6. Seems like Python expects a few more things from C extensions with 3.7...

That said, I don't have an alternative for this library. The other ones I've found are really low-level, whereas this feels pythonic

[nerosketch]

i was run it with little fixes under python3.7. Pull Request already wait for confirmation. I hope it will help anyone.
#117

[ngie-eign]

i was run it with little fixes under python3.7. Pull Request already wait for confirmation. I hope it will help anyone.
#117

I reviewed the code and it looks like it would actually break error reporting.

The problem is that some of the end-points are failing to set errors/create exceptions before returning NULL: https://stackoverflow.com/a/8450880 .

I'll look at fixing this, given that our project needs to move to python 3.7+ anyhow >_>...

[0weights]

i was run it with little fixes under python3.7. Pull Request already wait for confirmation. I hope it will help anyone.
#117

I reviewed the code and it looks like it would actually break error reporting.

The problem is that some of the end-points are failing to set errors/create exceptions before returning NULL: https://stackoverflow.com/a/8450880 .

I'll look at fixing this, given that our project needs to move to python 3.7+ anyhow >_>...

hey did you find a solution for this problem

[nerosketch]

I was updated my branch, please check it again anyone. I wasn't familiar with the subject. Now more errors return correctly, but I not tested all functions, only netsnmp_get and netsnmp_walk.

[ngie-eign]

@sayed797: hey did you find a solution for this problem

Nope. I've been way too busy...

[itheodoridis]

I am having a similar issue (I guess it's the same) when using the check_ip_sla nagios plugin which uses easysnmp. The python version is 3.8.2.

[uedvt359]

Pinging possibly interested people: I am proposing a different, much smaller, patch for this at #129.

[kamakazikamikaze]

I recommend pulling the latest source and testing it to see if your issue is resolved. (Assuming that you're still using this package.)

[Taxelas]

In my case it was wrong community string