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-rw-r--r--Lib/multiprocessing/forkserver.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/Lib/multiprocessing/forkserver.py b/Lib/multiprocessing/forkserver.py
index 681af2610e9..c91891ff162 100644
--- a/Lib/multiprocessing/forkserver.py
+++ b/Lib/multiprocessing/forkserver.py
@@ -222,6 +222,10 @@ def main(listener_fd, alive_r, preload, main_path=None, sys_path=None,
except ImportError:
pass
+ # gh-135335: flush stdout/stderr in case any of the preloaded modules
+ # wrote to them, otherwise children might inherit buffered data
+ util._flush_std_streams()
+
util._close_stdin()
sig_r, sig_w = os.pipe()