CI fails with crashing server on Python 3.3, 3.6

[tomato42]

Bug Report

System Information

Type	Version/Name
Operating System Name	Ubuntu
Operating System Version	18.04
Python version	3.3.7
tlslite-ng version	0.8.0-alpha42
tlsfuzzer revision	CI, so master, started to be regular around fe2e4af

Problem description

server sometimes crashes during scripts_retention.py with -11 (SIGSEGV)

Describe how to reproduce the problem

run the CI test suite on python 3.3

Expected behaviour

consistently passing test suite

Include errors or backtraces

logging doesn't capture the backtrace :/

Additional context

crashed when running the test-certificate-request.py test and test-certificate-malformed.py

while the runs on py3.3 don't use m2crypto, they do use gmpy and gmpy2

[tomato42]

I've disabled gmpy and gmpy2 on py3.3 for now, lets see if it helps

[tomato42]

It also sometimes crashes on 3.6: https://github.com/tlsfuzzer/tlsfuzzer/runs/5127335500?check_suite_focus=true

[tomato42]

Crashed on 3.6 again: https://github.com/tlsfuzzer/tlsfuzzer/actions/runs/3849462217/jobs/6558478115
https://github.com/tlsfuzzer/tlsfuzzer/actions/runs/3849462217/jobs/6558478680
https://github.com/tlsfuzzer/tlsfuzzer/actions/runs/3849462217/jobs/6558479205

[tomato42]

multiple crashes on py3.6 again, with m2crypto installed