[pysnmp-users] pysnmp leaks temporary resources running script with root privileges under Ubuntu 14.04

[Markus B. <mb...@ma...>]

Hello,
i found out that running a pysnmp script as root with a self assigned SnmpEngineId 
leads to a resource leak (missing close) of temporary files generated by pysnmp.

The attached testscript demonstrates the Problem.

if i start the script with 'sudo ./pysnmp_fd.py' and investigate the list of open files with 
'sudo lsof -p <pidofscript>' i get this for example:

...
python3 26101 root    5u  IPv4 973309      0t0     UDP *:39370 
python3 26101 root    6u   REG   8,33        0 4068419 
/tmp/__pysnmp/0x8000000001020304/tmpl5h37q3f
python3 26101 root    7u   REG   8,33        0 4068420 
/tmp/__pysnmp/0x8000000001020304/tmpcenfh0fm
python3 26101 root    8u   REG   8,33        0 4068423 
/tmp/__pysnmp/0x8000000001020304/tmpwojwxt30
python3 26101 root    9u   REG   8,33        0 4068421 
/tmp/__pysnmp/0x8000000001020304/tmpkfs4hu1f
python3 26101 root   10u   REG   8,33        0 4068426 
/tmp/__pysnmp/0x8000000001020304/tmptxdjiven
python3 26101 root   11u   REG   8,33        0 4068422 
/tmp/__pysnmp/0x8000000001020304/tmpnch_emnz
python3 26101 root   12u   REG   8,33        0 4068424 
/tmp/__pysnmp/0x8000000001020304/tmpf0lxqusd
python3 26101 root   13u  IPv4 973311      0t0     UDP *:36011 
python3 26101 root   14u   REG   8,33        0 4068425 
/tmp/__pysnmp/0x8000000001020304/tmphtq5h3bb
python3 26101 root   15u   REG   8,33        0 4068427 
/tmp/__pysnmp/0x8000000001020304/tmpt1d5xmmy
python3 26101 root   16u  IPv4 973320      0t0     UDP *:36018 
...

The List of files will grow until the max number of filedescriptors is reached (throwing 
an exception).
If I remove the self assigned EngineId from SNMPEngine()'s Ctor no temporary files are 
created.

Am I doing something wrong??


System: Ubuntu 14.04 x86_64
pysnmp: Version: 4.3.2
python: Python 3.4.3


Best Regards

Markus Bienst