[New-bugs-announce] [issue29938] subprocess.run calling bash on windows10 cause 0x80070057 error when capture stdout with PIPE

[SLAPaper]

New submission from SLAPaper:

print(subprocess.run("bash -c ls", shell=True, stdout=subprocess.PIPE, encoding='utf_16_le').stdout)
# 错误: 0x80070057
# error: 0x80070057

And the returncode is 4294967295.

OS: Simp-Chinese Win10; Bash on Windows(Ubuntu 14.04 LTS).
Python 3.5 and Python 3.6 produce the same issue.

While not capture stdout, the command works just fine and output the result onto screen.

----------
components: Windows
messages: 290762
nosy: SLAPaper, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: subprocess.run calling bash on windows10 cause 0x80070057 error when capture stdout with PIPE
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29938>
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