[New-bugs-announce] [issue22685] memory leak: no transport for pipes by create_subprocess_exec/shell

[wabu]

New submission from wabu:

using `p = create_subprocess_exec(..., stdout=subprocess.PIPE, limit=...)`, 
p.stdout has not transport set, so the underlying protocol is unable to pause the reading of the transport, resulting in high memory usage when slowly consuming input from p.stdout, even if the limit parameter is passed. 

A workaround is to set the transport manually after creating the subprocess:
`p.stdout.set_transport(p._transport.get_pipe_transport(1))`, but this should happen inside the create_subprocess call.

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components: asyncio
messages: 229763
nosy: gvanrossum, haypo, wabu, yselivanov
priority: normal
severity: normal
status: open
title: memory leak: no transport for pipes by create_subprocess_exec/shell
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22685>
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