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subprocess.Popen() hangs: parent process hangs at os.read(errpipe_read) and child hangs at _posixsubprocess.fork_exec()

I have a python program (let's call it my_prog.py) that starts multiple threads of periodic tasks in one process. Some periodic tasks involvs writing to a file and calls "setfacl" command after the ...
GitHub

# python协程subprocess异步读取Popen的stdout和stderr

Python的subprocess模块可以很容易地生成子进程，类似Linux系统调用fork和exec。subprocess模块的Popen ...