osmith has uploaded this change for review. (
https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/41834?usp=email )
Change subject: testenv: fix crash with python 3.14
......................................................................
testenv: fix crash with python 3.14
Python 3.14 changed the default multiprocessing start method from "fork"
to "forkserver", which breaks multiprocessing.Process() as used in
testenv.podman.start_in_background(). Restore the previous behavior.
Fix for:
$ ./testenv.py run -n -p -a bts -c generic
[testenv] osmo-dev dir: /home/pespin/dev/sysmocom/git/osmo-dev
[testenv] Logging to: /tmp/testenv-bts-generic-20260113-1138-f5a1a95e-p7ws27qq
[testenv] + ['rm', '/tmp/logs']
[testenv] + ['ln', '-sf',
'/tmp/testenv-bts-generic-20260113-1138-f5a1a95e-p7ws27qq', '/tmp/logs']
[testenv] + ['podman', 'image', 'exists', 'debian-trixie-osmo-ttcn3-testenv']
[testenv] + ['podman', 'history', 'debian-trixie-osmo-ttcn3-testenv',
'--format', 'json']
[testenv] Image creation date: 2025-12-19 13:01:15
[testenv] Dockerfile last modified: 2025-12-19 12:57:25
[testenv] + ['podman', 'run', '--rm', '--name',
'testenv-bts-generic-20260113-1138-f5a1a95e-0', '--log-driver', 'json-file',
'--log-opt',
'path=/tmp/testenv-bts-generic-20260113-1138-f5a1a95e-p7ws27qq/podman/testenv-bts-generic-20260113-1138-f5a1a95e-0.log',
'--security-opt=seccomp=/home/pespin/dev/sysmocom/git/osmo-ttcn3-hacks/_testenv/data/podman/seccomp.json',
'--cap-add=NET_ADMIN', '--cap-add=NET_RAW', '--cap-add=SYS_ADMIN',
'--device=/dev/net/tun', '--volume',
'/home/pespin/.cache/osmo-ttcn3-testenv/podman/var-cache-apt-debian-trixie:/var/cache/apt',
'--volume',
'/home/pespin/.cache/osmo-ttcn3-testenv/podman/var-lib-apt-debian-trixie:/var/lib/apt',
'--sysctl', 'net.ipv4.conf.all.send_redirects=0', '--sysctl',
'net.ipv4.conf.default.send_redirects=0', '-e', 'PODMAN=1', '--volume',
'/home/pespin/dev/sysmocom/git/osmo-dev:/home/pespin/dev/sysmocom/git/osmo-dev',
'--volume',
'/tmp/testenv-bts-generic-20260113-1138-f5a1a95e-p7ws27qq:/tmp/testenv-bts-generic-20260113-1138-f5a1a95e-p7ws27qq',
'--volume',
'/home/pespin/.cache/osmo-ttcn3-testenv:/home/pespin/.cache/osmo-ttcn3-testenv',
'--volume',
'/home/pespin/.cache/osmo-ttcn3-testenv/ccache:/home/pespin/.cache/osmo-ttcn3-testenv/ccache',
'--volume', '/home/pespin/dev/sysmocom/git:/home/pespin/dev/sysmocom/git',
'debian-trixie-osmo-ttcn3-testenv',
'/home/pespin/dev/sysmocom/git/osmo-ttcn3-hacks/_testenv/data/scripts/testenv-podman-main.sh']
Running testenv-podman-main.sh
usage: testenv.py [-h] {init,run,clean} ...
testenv.py: error: the following arguments are required: action
[testenv] Stopping podman container
[testenv] + ['podman', 'kill', 'testenv-bts-generic-20260113-1138-f5a1a95e-0']
testenv-bts-generic-20260113-1138-f5a1a95e-0
Traceback (most recent call last):
File "/home/pespin/dev/sysmocom/git/osmo-ttcn3-hacks/./testenv.py", line 133,
in <module>
main()
~~~~^^
File "/home/pespin/dev/sysmocom/git/osmo-ttcn3-hacks/./testenv.py", line 122,
in main
run()
~~~^^
File "/home/pespin/dev/sysmocom/git/osmo-ttcn3-hacks/./testenv.py", line 45,
in run
testenv.podman.start()
~~~~~~~~~~~~~~~~~~~~^^
File
"/home/pespin/dev/sysmocom/git/osmo-ttcn3-hacks/_testenv/testenv/podman.py",
line 280, in start
start_in_background(cmd)
~~~~~~~~~~~~~~~~~~~^^^^^
File
"/home/pespin/dev/sysmocom/git/osmo-ttcn3-hacks/_testenv/testenv/podman.py",
line 208, in start_in_background
feed_watchdog_process.start()
~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/lib/python3.14/multiprocessing/process.py", line 121, in start
self._popen = self._Popen(self)
~~~~~~~~~~~^^^^^^
File "/usr/lib/python3.14/multiprocessing/context.py", line 224, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/context.py", line 300, in _Popen
return Popen(process_obj)
File "/usr/lib/python3.14/multiprocessing/popen_forkserver.py", line 35, in
__init__
super().__init__(process_obj)
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/popen_fork.py", line 20, in __init__
self._launch(process_obj)
~~~~~~~~~~~~^^^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/popen_forkserver.py", line 51, in
_launch
self.sentinel, w = forkserver.connect_to_new_process(self._fds)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/forkserver.py", line 106, in
connect_to_new_process
connection.answer_challenge(
~~~~~~~~~~~~~~~~~~~~~~~~~~~^
wrapped_client, self._forkserver_authkey)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.14/multiprocessing/connection.py", line 970, in
answer_challenge
message = connection.recv_bytes(256) # reject large message
File "/usr/lib/python3.14/multiprocessing/connection.py", line 222, in
recv_bytes
buf = self._recv_bytes(maxlength)
File "/usr/lib/python3.14/multiprocessing/connection.py", line 447, in
_recv_bytes
buf = self._recv(4)
File "/usr/lib/python3.14/multiprocessing/connection.py", line 412, in _recv
chunk = read(handle, to_read)
ConnectionResetError: [Errno 104] Connection reset by peer
[testenv] Logs saved to:
/tmp/testenv-bts-generic-20260113-1138-f5a1a95e-p7ws27qq (symlink: /tmp/logs)
Related: https://docs.python.org/3/whatsnew/3.14.html#multiprocessing
Change-Id: I7995916548b27bdaba6a95e4679c5d1dd7caab4c
---
M _testenv/testenv.py
1 file changed, 6 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks
refs/changes/34/41834/1
diff --git a/_testenv/testenv.py b/_testenv/testenv.py
index 9e33e37..55d7896 100755
--- a/_testenv/testenv.py
+++ b/_testenv/testenv.py
@@ -2,6 +2,7 @@
# Copyright 2024 sysmocom - s.f.m.c. GmbH
# SPDX-License-Identifier: GPL-3.0-or-later
import logging
+import multiprocessing
import os
import sys
import testenv
@@ -114,6 +115,11 @@
def main():
+ # Python 3.14 changed the default multiprocessing start method from "fork"
+ # to "forkserver", which breaks multiprocessing.Process() as used in
+ # testenv.podman.start_in_background(). Restore the previous behavior.
+ multiprocessing.set_start_method("fork")
+
testenv.init_logging()
testenv.init_args()
--
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Gerrit-MessageType: newchange
Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Change-Id: I7995916548b27bdaba6a95e4679c5d1dd7caab4c
Gerrit-Change-Number: 41834
Gerrit-PatchSet: 1
Gerrit-Owner: osmith <[email protected]>
