[bitbake][scarthgap][2.8][PATCH 1/1] runqueue.py: make sure we use bb multiprocessing

From: Trevor Gamblin <[email protected]>

Otherwise, we see errors like:

|ERROR: An uncaught exception occurred in runqueue
|Traceback (most recent call last):
|  File "/srv/pokybuild/yocto-worker/check-layer/build/layers/bitbake/lib/bb/runqueue.py", line 1663, in execute_runqueue
|    return self._execute_runqueue()
|           ~~~~~~~~~~~~~~~~~~~~~~^^
|  File "/srv/pokybuild/yocto-worker/check-layer/build/layers/bitbake/lib/bb/runqueue.py", line 1607, in _execute_runqueue
|    retval = self.dump_signatures(dumpsigs)
|  File "/srv/pokybuild/yocto-worker/check-layer/build/layers/bitbake/lib/bb/runqueue.py", line 1718, in dump_signatures
|    p.start()
|    ~~~~~~~^^
|  File "/usr/lib64/python3.14/multiprocessing/process.py", line 121, in start
|    self._popen = self._Popen(self)
|                  ~~~~~~~~~~~^^^^^^
|  File "/usr/lib64/python3.14/multiprocessing/context.py", line 224, in _Popen
|    return _default_context.get_context().Process._Popen(process_obj)
|           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
|  File "/usr/lib64/python3.14/multiprocessing/context.py", line 300, in _Popen
|    return Popen(process_obj)
|  File "/usr/lib64/python3.14/multiprocessing/popen_forkserver.py", line 35, in __init__
|    super().__init__(process_obj)
|    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
|  File "/usr/lib64/python3.14/multiprocessing/popen_fork.py", line 20, in __init__
|    self._launch(process_obj)
|    ~~~~~~~~~~~~^^^^^^^^^^^^^
|  File "/usr/lib64/python3.14/multiprocessing/popen_forkserver.py", line 47, in _launch
|    reduction.dump(process_obj, buf)
|    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
|  File "/usr/lib64/python3.14/multiprocessing/reduction.py", line 60, in dump
|    ForkingPickler(file, protocol).dump(obj)
|    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^
|_pickle.PicklingError: Can't pickle local object <function CoreRecipeInfo.init_cacheData.<locals>.<lambda> at 0x7f7925667d70>
|when serializing tuple item 0
|when serializing collections.defaultdict reconstructor arguments
|when serializing collections.defaultdict object
|when serializing dict item 'rundeps'
|when serializing bb.cache.CacheData state
|when serializing bb.cache.CacheData object
|when serializing dict item ''
|when serializing dict item 'recipecaches'
|when serializing bb.cooker.BBCooker state
|when serializing bb.cooker.BBCooker object
|when serializing dict item 'cooker'
|when serializing bb.runqueue.RunQueue state
|when serializing bb.runqueue.RunQueue object
|when serializing tuple item 0
|when serializing method reconstructor arguments
|when serializing method object
|when serializing dict item '_target'
|when serializing multiprocessing.context.Process state
|when serializing multiprocessing.context.Process object

Fixes: [YOCTO #16184]

Signed-off-by: Trevor Gamblin <[email protected]>
Signed-off-by: Richard Purdie <[email protected]>
(cherry picked from commit 35866d55908009df429870b28cda0d2266074b48)
Signed-off-by: Yoann Congal <[email protected]>
---
 lib/bb/runqueue.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/bb/runqueue.py b/lib/bb/runqueue.py
index db68f97e6..5dc6fc047 100644
--- a/lib/bb/runqueue.py
+++ b/lib/bb/runqueue.py
@@ -22,11 +22,12 @@ from bb import msg, event
 from bb import monitordisk
 import subprocess
 import pickle
-from multiprocessing import Process
 import shlex
 import pprint
 import time
 
+Process = bb.multiprocessing.Process
+
 bblogger = logging.getLogger("BitBake")
 logger = logging.getLogger("BitBake.RunQueue")
 hashequiv_logger = logging.getLogger("BitBake.RunQueue.HashEquiv")