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Re: Bug in Python3 ('tempfile', 'subprocess', '_hashlib')

Thank you guys for your help. I did a full rebase to no avail. But this now looks like an issue specific to my machine, I asked some of my colleagues to run some tests on their PCs and they cannot reproduce this issue either. I could try to reinstall Cygwin from scratch, but I am going to update to a new machine soon and my workaround allows me to keep going for the time being, so I have decided it's not worth spending any more time on this, unless someone feels this could be of general interest. Thanks again for your assistance.


On 09/04/18 11:14, Yaakov Selkowitz wrote:
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'pwd')

always results in 'BlockingIOError: [Errno 11] Resource temporarily

I saw this error first in a script that imported 'tempfile' together
with 'subprocess' (in any order):

     import subprocess
     import tempfile'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/' 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.

Giuseppe B. Scelsi  (
Senior Design Engineer, Analog Devices Australia Pty Ltd
Unit 3, 97 Lewis Road, Wantirna, Victoria, 3152, AUSTRALIA
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