STINNER Victor <vstin...@redhat.com> added the comment:

I tested:

* Python 2.6.6 (installed from RHEL) on RHEL6
* Python 2.7.15 (compiled manually) on RHEL6
* Python 2.7.15 (installed from Fedora) on Fedora 29

Note: I tested RHEL 6.10 with kernel 2.6.32-754.el6.x86_64.

The fact that Python 3 is also impacted makes me think that it's a bug in your 
kernel, not in Python.


"MY CONCLUSION: To me, this looks like a deadlock in Popen() itself - is that 
correct?"

It works on all systems except of yours, I don't think that it's a bug in 
Python.

You have to debug your kernel.

This issue is not a Python bug, so I close it.

If you are a Red Hat customer, contact Red Hat to get support.

----------
resolution:  -> third party
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35305>
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