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Miss Islington (bot) 4e036d376e
[3.13] gh-117378: Fix multiprocessing forkserver preload sys.path inheritance. (GH-126538) (GH-126632) 
gh-117378: Fix multiprocessing forkserver preload sys.path inheritance. (GH-126538)

`sys.path` was not properly being sent from the parent process when launching
the multiprocessing forkserver process to preload imports.  This bug has been
there since the forkserver start method was introduced in Python 3.4.  It was
always _supposed_ to inherit `sys.path` the same way the spawn method does.

Observable behavior change: A `''` value in `sys.path` will now be replaced in
the forkserver's `sys.path` with an absolute pathname
`os.path.abspath(os.getcwd())` saved at the time that `multiprocessing` was
imported in the parent process as it already was when using the spawn start
method. **This will only be observable during forkserver preload imports**.

The code invoked before calling things in another process already correctly sets `sys.path`.
Which is likely why this went unnoticed for so long as a mere performance issue in
some configurations.

A workaround for the bug on impacted Pythons is to set PYTHONPATH in the
environment before multiprocessing's forkserver process was started. Not perfect
as that is then inherited by other children, etc, but likely good enough for many
people's purposes.

(cherry picked from commit 9d08423b6e)

Co-authored-by: Gregory P. Smith <greg@krypto.org>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
2024-11-09 15:47:58 -08:00
..
NEWS.d [3.13] gh-117378: Fix multiprocessing forkserver preload sys.path inheritance. (GH-126538) (GH-126632) 2024-11-09 15:47:58 -08:00
rhel7 gh-95957: Add instructions for Tcl/Tk and OpenSSL on RHEL/CentOS 7 (#95964) 2022-08-16 13:44:02 +02:00
ACKS [3.13] gh-126417: Register multiprocessing proxy types to an appropriate collections.abc class (#126419) (#126435) 2024-11-05 11:22:44 +00:00
coverity_model.c [3.13] Fix typos (#123775) (#123866) 2024-10-07 23:44:31 +02:00
externals.spdx.json [3.13] gh-124448: Update Windows builds to use Tcl/Tk 8.6.15 (GH-125795) 2024-10-21 11:55:15 -05:00
HISTORY [3.13] gh-123492: Remove unnecessary :func: parentheses (gh-123493) (#123513) 2024-08-30 20:14:48 +03:00
indent.pro
platform_triplet.c gh-114099: Modify preprocessor symbol usage to support older macOS SDKs (GH-118073) 2024-04-19 14:56:33 -04:00
Porting
python-config.in bpo-45101: Add consistency in usage message IO between 2 versions of python-config (GH-28162) 2024-02-26 22:04:44 +02:00
python-config.sh.in [3.13] gh-116622: Rename build variable MODULE_LDFLAGS back to LIBPYTHON (GH-122764) (GH-122842) 2024-08-09 14:45:04 -07:00
python-embed.pc.in bpo-36721: Add --embed option to python-config (GH-13500) 2019-05-23 03:30:23 +02:00
python.man [3.13] gh-121101: Document -Wall option (an alias for -Walways) (GH-121102) (#121146) 2024-06-29 13:57:11 +05:30
python.pc.in [3.13] gh-116622: Rename build variable MODULE_LDFLAGS back to LIBPYTHON (GH-122764) (GH-122842) 2024-08-09 14:45:04 -07:00
README gh-102809: Remove gdbinit mention in Misc/README (#103269) 2023-04-08 00:04:23 -07:00
README.AIX bpo-42087: Remove support for AIX 5.3 and below (GH-22830) 2020-11-16 16:16:10 +01:00
README.coverity
README.valgrind closes docs: remove references to Py_USING_MEMORY_DEBUGGER (GH-30284) 2021-12-29 16:20:42 -06:00
sbom.spdx.json [3.13] gh-123678: Upgrade libexpat 2.6.3 (GH-123689) (GH-123707) 2024-09-05 13:37:40 +02:00
SpecialBuilds.txt gh-108634: Py_TRACE_REFS uses a hash table (#108663) 2023-08-31 18:33:34 +02:00
stable_abi.toml [3.13] gh-119521: Rename IncompleteInputError to _IncompleteInputError and remove from public API/ABI (GH-119680, GH-120955) (GH-120944) 2024-06-24 20:23:30 +02:00
svnmap.txt
valgrind-python.supp [3.13] gh-121096: Ignore dlopen() leaks in Valgrind suppression file (GH-121097) (#121122) 2024-06-28 11:26:37 +00:00
vgrindefs

README 

Python Misc subdirectory
========================

This directory contains files that wouldn't fit in elsewhere.  Some
documents are only of historic importance.

Files found here
----------------

ACKS                    Acknowledgements
HISTORY                 News from previous releases -- oldest last
indent.pro              GNU indent profile approximating my C style
NEWS                    News for this release (for some meaning of "this")
Porting                 Mini-FAQ on porting to new platforms
python-config.in        Python script template for python-config
python.man              UNIX man page for the python interpreter
python.pc.in            Package configuration info template for pkg-config
README                  The file you're reading now
README.AIX              Information about using Python on AIX
README.coverity         Information about running Coverity's Prevent on Python
README.valgrind         Information for Valgrind users, see valgrind-python.supp
SpecialBuilds.txt       Describes extra symbols you can set for debug builds
svnmap.txt              Map of old SVN revs and branches to hg changeset ids,
                        help history-digging
valgrind-python.supp    Valgrind suppression file, see README.valgrind
vgrindefs               Python configuration for vgrind (a generic pretty printer)