https://github.com/python/cpython/commit/614a28b3da1c898f29c34c14f59bf2d496dbd31d
commit: 614a28b3da1c898f29c34c14f59bf2d496dbd31d
branch: main
author: Gregory P. Smith <[email protected]>
committer: gpshead <[email protected]>
date: 2025-11-23T09:52:26Z
summary:
gh-98552: Revert (unneeded, already done elsewhere) "flush std streams in the
multiprocessing forkserver before fork (#141849)" (#141871)
Revert (unneeded, already done elsewhere) "gh-98552: flush std streams in the
multiprocessing forkserver before fork (#141849)"
This reverts commit 58badb1711e12b6e8b5240ab96cdd01b95012de7.
files:
D Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst
M Lib/multiprocessing/forkserver.py
diff --git a/Lib/multiprocessing/forkserver.py
b/Lib/multiprocessing/forkserver.py
index 8a4e8d835b0c91..cc8947c5e04fb1 100644
--- a/Lib/multiprocessing/forkserver.py
+++ b/Lib/multiprocessing/forkserver.py
@@ -326,7 +326,6 @@ def sigchld_handler(*_unused):
len(fds)))
child_r, child_w, *fds = fds
s.close()
- util._flush_std_streams()
pid = os.fork()
if pid == 0:
# Child
diff --git
a/Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst
b/Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst
deleted file mode 100644
index 37a71ac1fff3f3..00000000000000
--- a/Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst
+++ /dev/null
@@ -1,4 +0,0 @@
-The :mod:`multiprocessing` forkserver process now flushes stdout and stderr
-before it forks to avoid the confusion children inheriting any buffered but
-not yet written output data. Normally there is none, but when using
-:func:`multiprocessing.set_forkserver_preload` there *could* be.
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