* Bug in Python3 ('tempfile', 'subprocess', '_hashlib')
@ 2018-04-06 1:14 Giuseppe Scelsi
2018-04-06 1:46 ` Dave Caswell
2018-04-09 1:14 ` Yaakov Selkowitz
0 siblings, 2 replies; 4+ messages in thread
From: Giuseppe Scelsi @ 2018-04-06 1:14 UTC (permalink / raw)
To: cygwin
Hi,
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?
Best regards,
Giuseppe
--
Giuseppe B. Scelsi (giuseppe.scelsi@analog.com)
Senior Design Engineer, Analog Devices Australia Pty Ltd
Unit 3, 97 Lewis Road, Wantirna, Victoria, 3152, AUSTRALIA
Direct: +61 3 9881 9909 Main: +61 3 9881 9999
Fax: +61 3 9881 9988 Web: www.analog.com/au
Embedded & Digital Signal Processing Software.
This communication is proprietary and confidential.
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Bug in Python3 ('tempfile', 'subprocess', '_hashlib')
2018-04-06 1:14 Bug in Python3 ('tempfile', 'subprocess', '_hashlib') Giuseppe Scelsi
@ 2018-04-06 1:46 ` Dave Caswell
2018-04-09 1:14 ` Yaakov Selkowitz
1 sibling, 0 replies; 4+ messages in thread
From: Dave Caswell @ 2018-04-06 1:46 UTC (permalink / raw)
To: cygwin
On Thu, Apr 5, 2018 at 7:14 PM, Giuseppe Scelsi
<giuseppe.scelsi@analog.com> wrote:
> Hi,
>
> 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?
>
> Best regards,
>
> Giuseppe
>
Tried to reproduce:
davec@SodiumWin ~/tmp
$ cat py3t.py
#!/usr/bin/python3
import subprocess
import _hashlib
import _sha3
subprocess.run('pwd')
davec@SodiumWin ~/tmp
$ ./py3t.py
/home/davec/tmp
Everything seems to work OK for me. This is with a recently updated Cygwin 64.
--
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Documentation: http://cygwin.com/docs.html
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Bug in Python3 ('tempfile', 'subprocess', '_hashlib')
2018-04-06 1:14 Bug in Python3 ('tempfile', 'subprocess', '_hashlib') Giuseppe Scelsi
2018-04-06 1:46 ` Dave Caswell
@ 2018-04-09 1:14 ` Yaakov Selkowitz
2018-04-09 23:40 ` Giuseppe Scelsi
1 sibling, 1 reply; 4+ messages in thread
From: Yaakov Selkowitz @ 2018-04-09 1:14 UTC (permalink / raw)
To: cygwin
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:
>
> Â Â Â import subprocess
> Â Â Â import _hashlib
> Â Â Â import _sha3
> Â Â Â 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):
>
> Â Â Â import subprocess
> Â Â Â import tempfile
> Â Â Â 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:
>
> Â Â Â __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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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Bug in Python3 ('tempfile', 'subprocess', '_hashlib')
2018-04-09 1:14 ` Yaakov Selkowitz
@ 2018-04-09 23:40 ` Giuseppe Scelsi
0 siblings, 0 replies; 4+ messages in thread
From: Giuseppe Scelsi @ 2018-04-09 23:40 UTC (permalink / raw)
To: cygwin
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.
Giuseppe
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:
>>
>> Â Â Â import subprocess
>> Â Â Â import _hashlib
>> Â Â Â import _sha3
>> Â Â Â 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):
>>
>> Â Â Â import subprocess
>> Â Â Â import tempfile
>> Â Â Â 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:
>>
>> Â Â Â __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 (giuseppe.scelsi@analog.com)
Senior Design Engineer, Analog Devices Australia Pty Ltd
Unit 3, 97 Lewis Road, Wantirna, Victoria, 3152, AUSTRALIA
Direct: +61 3 9881 9909 Main: +61 3 9881 9999
Fax: +61 3 9881 9988 Web: www.analog.com/au
Embedded & Digital Signal Processing Software.
This communication is proprietary and confidential.
--
Problem reports: http://cygwin.com/problems.html
FAQ: http://cygwin.com/faq/
Documentation: http://cygwin.com/docs.html
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
^ permalink raw reply [flat|nested] 4+ messages in thread
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2018-04-06 1:14 Bug in Python3 ('tempfile', 'subprocess', '_hashlib') Giuseppe Scelsi
2018-04-06 1:46 ` Dave Caswell
2018-04-09 1:14 ` Yaakov Selkowitz
2018-04-09 23:40 ` Giuseppe Scelsi
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