[BUG] minion using multiprocessing will leek pipe fd

[liangyihong]

Description While minion config multiprocessing is True, parent process will leek fd, because multiprocessing using popen. In class SubprocessList , it's function cleanup need to add proc.join() if using multiprocessing , to clean parent process fd(pipe).

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[dwoz]

@liangyihong I see join getting called here: https://github.com/saltstack/salt/blob/3006.x/salt/utils/process.py#L1175

[liangyihong]

@liangyihong I see join getting called here: https://github.com/saltstack/salt/blob/3006.x/salt/utils/process.py#L1175

@dwoz Sorry, that was a typo. It need to add proc.close() to clean parent process fd(pipe).In python3, package multiprocessing/popen_fork.py, the class Popen need call close() to clean parent pipe fd.

[dwoz]

@liangyihong I see join getting called here: https://github.com/saltstack/salt/blob/3006.x/salt/utils/process.py#L1175

@dwoz Sorry, that was a typo. It need to add proc.close() to clean parent process fd(pipe).In python3, package multiprocessing/popen_fork.py, the class Popen need call close() to clean parent pipe fd.

Makes sense, thanks.

[twangboy]

Fixed by #66778