Illegal instruction on etree import inside docker container

[Thomas Walton]

I'm inside a docker container. Importing lxml 3.7.0 exits with "Illegal instruction". This is not the case on older lxml:

user@desktop:/d3/workspace$ docker run -it ubuntu:xenial
root@46b02a5fa372:/# apt-get update
[...]
root@46b02a5fa372:/# apt-get install python3-dev python3-pip
[...]
root@46b02a5fa372:/# pip3 install lxml
Collecting lxml
  Downloading lxml-3.7.0-cp35-cp35m-manylinux1_x86_64.whl (7.1MB)
    100% |################################| 7.1MB 131kB/s
Installing collected packages: lxml
Successfully installed lxml-3.7.0
You are using pip version 8.1.1, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
root@46b02a5fa372:/# python3
Python 3.5.2 (default, Nov 17 2016, 17:05:23)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from lxml import etree
Illegal instruction

Downgrading works fine:

root@46b02a5fa372:/# pip3 install lxml==3.6.4
Collecting lxml==3.6.4
  Downloading lxml-3.6.4-cp35-cp35m-manylinux1_x86_64.whl (4.2MB)
    100% |################################| 4.2MB 257kB/s
Installing collected packages: lxml
  Found existing installation: lxml 3.7.0
    Uninstalling lxml-3.7.0:
      Successfully uninstalled lxml-3.7.0
Successfully installed lxml-3.6.4
You are using pip version 8.1.1, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
root@46b02a5fa372:/# python3.5
Python 3.5.2 (default, Nov 17 2016, 17:05:23)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from lxml import etree
>>>

[John L. Villalovos (happycamp)]

This seems to be a duplicate of:
https://bugs.launchpad.net/lxml/+bug/1652191