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gh-94777: Fix deadlock in ProcessPoolExecutor (GH-94784) Fixes a hang in multiprocessing process pool executor when a child process crashes and code could otherwise block on writing to the pipe. See GH-94777 for more details. (cherry picked from commit 6782fc050281205734700a1c3e13b123961ed15b) Co-authored-by: Louis Paulot <55740424+lpaulot@users.noreply.github.com>