Windows: Python prompt gets stuck on exit()

[nehaljwani]

Description

Python prompt gets stuck on exit() after importing mxnet

Environment info (Required)

(mxnetpypi) F:\nwani>python sources\im\tools\diagnose.py
----------Python Info----------
Version      : 3.6.3
Compiler     : MSC v.1900 64 bit (AMD64)
Build        : ('default', 'Nov  8 2017 15:10:56')
Arch         : ('64bit', 'WindowsPE')
------------Pip Info-----------
Version      : 9.0.1
Directory    : F:\nwani\mc3\envs\mxnetpypi\lib\site-packages\pip
----------MXNet Info-----------
Version      : 1.0.0
Directory    : F:\nwani\mc3\envs\mxnetpypi\lib\site-packages\mxnet
Commit Hash   : 0f05c65492e38f89012e5595c6d60bb67e2d418f
----------System Info----------
Platform     : Windows-7-6.1.7601-SP1
system       : Windows
node         : xxxxx-win64-gpu
release      : 7
version      : 6.1.7601
----------Hardware Info----------
machine      : AMD64
processor    : Intel64 Family 6 Model 63 Stepping 2, GenuineIntel
Name
Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz

----------Network Test----------
Setting timeout: 10
Timing for MXNet: https://github.com/apache/incubator-mxnet, DNS: 0.0156 sec, LOAD: 1.2012 sec.
Timing for Gluon Tutorial(en): http://gluon.mxnet.io, DNS: 0.2652 sec, LOAD: 0.0780 sec.
Error open Gluon Tutorial(cn): https://zh.gluon.ai, <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)>, DNS finis
hed in 0.2652003765106201 sec.
Timing for FashionMNIST: https://apache-mxnet.s3-accelerate.dualstack.amazonaws.com/gluon/dataset/fashion-mnist/train-labels-idx1-ubyte.gz, DNS: 0.062
4 sec, LOAD: 0.4368 sec.
Timing for PYPI: https://pypi.python.org/pypi/pip, DNS: 0.0312 sec, LOAD: 0.1872 sec.
Timing for Conda: https://repo.continuum.io/pkgs/free/, DNS: 0.0000 sec, LOAD: 0.1872 sec.
...gets stuck here, I have to end the process python.exe

Package used (Python/R/Scala/Julia):

(mxnetpypi) F:\nwani>python -V
Python 3.6.3 :: Anaconda, Inc.

Minimum reproducible example

(base) F:\nwani> conda create -yn mxnetpypi python pip
(base) F:\nwani> conda activate mxnetpypi
(mxnetpypi) F:\nwani>pip install mxnet --no-cache-dir
(mxnetpypi) F:\nwani>python
Python 3.6.3 |Anaconda, Inc.| (default, Nov  8 2017, 15:10:56) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import mxnet
>>> exit()
...gets stuck here, I have to end the process python.exe

[nehaljwani]

EDIT This doesn't work for all cases

If I comment out

atexit.register(_notify_shutdown)

at https://github.com/apache/incubator-mxnet/blob/1.0.0/python/mxnet/base.py#L394 the problem goes away. Of course, that's just a workaround.

[nehaljwani]

Additional findings:

• So far reproducible only on Windows 7. Windows 10 doesn't face this issue.
• This problem isn't specific to Anaconda Python. I tried with the installer from https://www.python.org/downloads/ too. Same problem.

[rf987]

+1

I'm having the same issue on Windows 7, running mxnet '0.11.0'
I have to manually kill the python process whenever I create a model or even load a model from checkpoint.

[freshcoderman]

+1
same issue on Windows7, running mxnet '1.0.0' with both python2 and python3 as long as I do "import mxnet as mx"

[TinkerSteve]

+1
win7 64bit python 3.5.4
mxnet.version = '1.0.0'

actually one more information that might help:

If I open the properties dialog of the blocked python process in SysInternals Process Explorer and activate the "Threads" Tab ... the process finishes immediately.

Commenting
atexit.register(_notify_shutdown)
does not prevent the issue on my side

[marcoabreu]

Possibly related to #8921

[rf987]

+1 . any updates on this? This one bug is making our team consider migrating to TensorFlow

[srochel]

@rf987 - we are investigating. We think we found the root cause and are discussing potential resolution.

[vandanavk]

is there a fix for this issue? would be great to verify it against #8921 too.

[yuanjunyi]

I have the same issue on win7 with mxnet 1.2.0 and python 3.6.6.

[zhangyichent]

+1 win7+anaconda python3.6.5 +mxnet(cpu)

[caigen]

+1. win7 + python 3.7 + pip mxnet.

[B5paper]

+1. win7 + python3.7 + miniconda + pip + mxnet-cu92==1.5.0

[gmx1992]

Proposed solution
https://blog.csdn.net/CR_Alvin/article/details/110631788