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Subject:	Re: Bug in Python3 ('tempfile', 'subprocess', '_hashlib')
To:	cygwin AT cygwin DOT com
References:	<8011548c-aefd-62a2-a492-69dca7646a44 AT analog DOT com>
From:	Yaakov Selkowitz <yselkowitz AT cygwin DOT com>
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Message-ID:	<911802ba-dc49-88a7-3abb-b542ad241fa5@cygwin.com>
Date:	Sun, 8 Apr 2018 20:14:29 -0500
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On 2018-04-05 20:14, Giuseppe Scelsi wrote:
> Using freshly-updated Cygwin 64-bit under Windows 7 Enterprise Ver 6.1
> and Python 3 version 3.6.4.
> 
> The execution of the following script:
> 
>     import subprocess
>     import _hashlib
>     import _sha3
>     subprocess.run('pwd')
> 
> always results in 'BlockingIOError: [Errno 11] Resource temporarily
> unavailable'.
> 
> I saw this error first in a script that imported 'tempfile' together
> with 'subprocess' (in any order):
> 
>     import subprocess
>     import tempfile
>     subprocess.run('pwd')
> 
> I then managed to narrow down the problem to the '_sha3' module.
> Notice that you need to import both '_hashlib' and '_sha3' *in that
> order*.  If I swap the order and import '_sha3' before '_hashlib', the
> error becomes sporadic, sometimes it happens and sometimes not.
> 
> This problem makes it impossible to use 'tempfile' and 'subprocess' in
> the same script.  My workaround is currently to disable '_sha3' in
> '/lib/python3.6/hashlib.py' by adding at line 62:
> 
>     __always_supported = __always_supported[0:8]
> 
> This problem only happens in Cygwin 64, 32-bit Cygwin works ok.
> 
> Can anyone reproduce this problem?

Not here.  This may be a fork issue though; please try rebase-trigger
all and run setup to see if that helps.

-- 
Yaakov

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