15858 2025-05-12 10:08:24 +0000 _pickle.PicklingError with python-3.14 2025-08-12 13:55:23 +0000 1 1 7 Build System, Metadata & Runtime BitBake bitbake unspecified x86 Multiple RESOLVED FIXED Medium+ normal 5.3 M3 1 Martin.Jansa JPEWhacker jacobpanov Martin.Jansa poky.bs.watcher poky.watcher randy.macleod yoann.congal --- --- No (bug/feature does not impact docs) oldest_to_newest 101937 0 Martin.Jansa 2025-05-12 10:08:24 +0000 With python-3.14 in gentoo bitbake fails to start with PicklingError ERROR: Attempting to set server environment: Unable to update the server configuration with local parameters: Traceback (most recent call last): File "/OE/build/luneos-whinlatter/bitbake/lib/bb/command.py", line 91, in runCommand result = command_method(self, commandline) File "/OE/build/luneos-whinlatter/bitbake/lib/bb/command.py", line 291, in updateConfig command.cooker.updateConfigOpts(options, environment, cmdline) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/OE/build/luneos-whinlatter/bitbake/lib/bb/cooker.py", line 471, in updateConfigOpts self.reset() ~~~~~~~~~~^^ File "/OE/build/luneos-whinlatter/bitbake/lib/bb/cooker.py", line 1741, in reset self.handlePRServ() ~~~~~~~~~~~~~~~~~^^ File "/OE/build/luneos-whinlatter/bitbake/lib/bb/cooker.py", line 306, in handlePRServ self.prhost = prserv.serv.auto_start(self.data) ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^ File "/OE/build/luneos-whinlatter/bitbake/lib/prserv/serv.py", line 444, in auto_start singleton.start() ~~~~~~~~~~~~~~~^^ File "/OE/build/luneos-whinlatter/bitbake/lib/prserv/serv.py", line 246, in start self.process = self.prserv.serve_as_process(log_level=logging.WARNING) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/OE/build/luneos-whinlatter/bitbake/lib/bb/asyncrpc/serv.py", line 402, in serve_as_process self.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 47, in _launch reduction.dump(process_obj, buf) ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.14/multiprocessing/reduction.py", line 60, in dump ForkingPickler(file, protocol).dump(obj) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^ _pickle.PicklingError: Can't pickle local object <function AsyncServer.serve_as_process.<locals>.run at 0x7fa4972eaf00> when serializing dict item '_target' when serializing multiprocessing.context.Process state when serializing multiprocessing.context.Process object 102410 1 JPEWhacker 2025-07-03 19:12:42 +0000 This is likely caused by Python 3.14 changing the default way that multiprocess starts child processes away from the 'fork' method (see https://docs.python.org/3/library/multiprocessing.html#contexts-and-start-methods). Bitbake relies heavily on the 'fork' method to share non-pickleable data with the child processes, so we'll need to change this for Python 3.14 compatability 102411 2 JPEWhacker 2025-07-03 19:14:02 +0000 And by "change" I mean that we'll need to instruct the python multiprocess to continue using the 'fork' method using either get_context() or set_start_method() so that our code remains compatible 102490 3 jacobpanov 2025-07-21 18:56:20 +0000 Joshua is right with the straightforward fix - just force 'fork' method on 3.14+. I've got a patch ready that handles this with proper fallback for platforms that don't support fork. Tested it by reproducing the original error (forcing spawn method) then confirming the fix prevents the PicklingError. This is my first contribution so I figured I'd start small. Appreciate it! 102491 4 JPEWhacker 2025-07-21 19:02:54 +0000 I also have a patch I've been testing for this 102492 5 jacobpanov 2025-07-21 19:07:24 +0000 Well what should we do then? I have no idea how to navigate things like this. 102493 6 JPEWhacker 2025-07-21 19:10:09 +0000 Feel free to send yours to the mailing list; We can look both over and see which we like better. Thanks 102501 7 JPEWhacker 2025-07-24 14:36:42 +0000 Fixed in bitbake 62be9113d98fccb347c6aa0a10d5c4ee2857f8b6 102583 8 5131 Martin.Jansa 2025-08-12 09:25:52 +0000 Created attachment 5131 log.do_populate_sysroot.333633 with the exception 102584 9 Martin.Jansa 2025-08-12 09:26:28 +0000 Even with the mentioned patch applied I'm seeing PicklingErrors as shown in attachment (to preserve formatting). 102585 10 Martin.Jansa 2025-08-12 09:40:18 +0000 Do we need to update meta/lib/oe/utils.py:import multiprocessing as well? now with new bitbake version required by oe-core we might be able to use it. It works for me, sent to ML: https://lists.openembedded.org/g/openembedded-core/message/221758 102586 11 JPEWhacker 2025-08-12 13:55:23 +0000 Yep, I forgot to loop back around and check OE after the bitbake fix. Thanks. 5131 2025-08-12 09:25:52 +0000 2025-08-12 09:25:52 +0000 log.do_populate_sysroot.333633 with the exception log.do_populate_sysroot.333633 text/plain 6098 Martin.Jansa REVCVUc6IEV4ZWN1dGluZyBweXRob24gZnVuY3Rpb24gc3N0YXRlX3Rhc2tfcHJlZnVuYwpERUJV RzogUHl0aG9uIGZ1bmN0aW9uIHNzdGF0ZV90YXNrX3ByZWZ1bmMgZmluaXNoZWQKREVCVUc6IEV4 ZWN1dGluZyBweXRob24gZnVuY3Rpb24gZG9fcG9wdWxhdGVfc3lzcm9vdApERUJVRzogRXhlY3V0 aW5nIHNoZWxsIGZ1bmN0aW9uIHN5c3Jvb3Rfc3RhZ2VfYWxsCjAgYmxvY2tzCjAgYmxvY2tzCjAg YmxvY2tzCkRFQlVHOiBTaGVsbCBmdW5jdGlvbiBzeXNyb290X3N0YWdlX2FsbCBmaW5pc2hlZApE RUJVRzogRXhlY3V0aW5nIHB5dGhvbiBmdW5jdGlvbiBzeXNyb290X3N0cmlwCkVSUk9SOiBFcnJv ciBleGVjdXRpbmcgYSBweXRob24gZnVuY3Rpb24gaW4gZXhlY19mdW5jX3B5dGhvbigpIGF1dG9n ZW5lcmF0ZWQ6CgpUaGUgc3RhY2sgdHJhY2Ugb2YgcHl0aG9uIGNhbGxzIHRoYXQgcmVzdWx0ZWQg aW4gdGhpcyBleGNlcHRpb24vZmFpbHVyZSB3YXM6CkZpbGU6ICdleGVjX2Z1bmNfcHl0aG9uKCkg YXV0b2dlbmVyYXRlZCcsIGxpbmVubzogMiwgZnVuY3Rpb246IDxtb2R1bGU+CiAgICAgMDAwMToK 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