port-amd64/59808: random python3 process crashes in NetBSD VMs

[twaldmann%thinkmo.de@localhost]

>Number:         59808
>Category:       port-amd64
>Synopsis:       random python3 process crashes in NetBSD VMs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 30 11:35:00 +0000 2025
>Originator:     Thomas Waldmann
>Release:        10.1
>Organization:
borgbackup.org
>Environment:
>Description:
We are seeing frequent Python3 process crashes only in NetBSD VMs. The same testsuite never has any such gw process crashes on Linux, macOS (not in a VM) or OpenBSD, FreeBSD or Haiku (running in same kind of VM).

Currently, this happens on GitHub actions runner machines (VMs based on Linux + kvm), but I have seen the same thing also on local Linux + virtualbox VMs with NetBSD.

It happens now on 10.1, but I have also seen this on 9.x since a long time.

It crashes randomly in some unit tests, for example:

________________________ src/borg/testsuite/archiver.py ________________________
[gw0] netbsd10 -- Python 3.11.13 /home/runner/work/borg/borg/.tox/py311-none/bin/python
worker 'gw0' crashed while running 'src/borg/testsuite/archiver.py::ArchiverTestCase::test_extract_with_pattern'

>How-To-Repeat:
Run the borgbackup tox tests in a NetBSD VM (crashes are quite frequent, but might need multiple runs to see).

>Fix: