run_tests_pool() shares the runner via the class attribute
TestRunner.shared_self, relying on worker processes to inherit it.
That only works with the 'fork' start method. Python 3.14 switched
the Linux default to 'forkserver', so workers see shared_self as
None and parallel runs abort with:
assert runner is not None
AssertionError
Only reproduces with Python 3.14+ and 'check -jN' (N > 1); meson
runs one test per process and never calls run_tests_pool(), so CI
is unaffected.
Request get_context('fork') explicitly; it is available on all
supported Python versions and a no-op before 3.14.
Signed-off-by: Denis V. Lunev <[email protected]>
CC: Kevin Wolf <[email protected]>
CC: Hanna Reitz <[email protected]>
---
tests/qemu-iotests/testrunner.py | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tests/qemu-iotests/testrunner.py b/tests/qemu-iotests/testrunner.py
index dbe2dddc32..5b2664d9f3 100644
--- a/tests/qemu-iotests/testrunner.py
+++ b/tests/qemu-iotests/testrunner.py
@@ -26,7 +26,7 @@
import json
import shutil
import sys
-from multiprocessing import Pool
+from multiprocessing import Pool, get_context
from typing import List, Optional, Any, Sequence, Dict
from testenv import TestEnv
@@ -125,7 +125,7 @@ def run_tests_pool(self, tests: List[str],
assert TestRunner.shared_self is None
TestRunner.shared_self = self
- with Pool(jobs) as p:
+ with get_context('fork').Pool(jobs) as p:
results = p.starmap(self.proc_run_test,
zip(tests, [test_field_width] * len(tests)))
--
2.53.0
