lxml issue in recent python 3.6 images

[sbidoul]

│ Traceback (most recent call last):                                                                                                                                                                                                                   │
│   File "/opt/odoo-venv/bin/odoo", line 7, in <module>                                                                                                                                                                                                │
│     exec(compile(f.read(), __file__, 'exec'))                                                                                                                                                                                                        │
│   File "/opt/odoo/setup/odoo", line 5, in <module>                                                                                                                                                                                                   │
│     import odoo                                                                                                                                                                                                                                      │
│   File "/opt/odoo/odoo/__init__.py", line 113, in <module>                                                                                                                                                                                           │
│     from . import modules                                                                                                                                                                                                                            │
│   File "/opt/odoo/odoo/modules/__init__.py", line 8, in <module>                                                                                                                                                                                     │
│     from . import db, graph, loading, migration, module, registry                                                                                                                                                                                    │
│   File "/opt/odoo/odoo/modules/graph.py", line 10, in <module>                                                                                                                                                                                       │
│     import odoo.tools as tools                                                                                                                                                                                                                       │
│   File "/opt/odoo/odoo/tools/__init__.py", line 7, in <module>                                                                                                                                                                                       │
│     from . import pdf                                                                                                                                                                                                                                │
│   File "/opt/odoo/odoo/tools/pdf.py", line 17, in <module>                                                                                                                                                                                           │
│     from odoo.tools.misc import file_open                                                                                                                                                                                                            │
│   File "/opt/odoo/odoo/tools/misc.py", line 34, in <module>                                                                                                                                                                                          │
│     from lxml import etree                                                                                                                                                                                                                           │
│ ImportError: /opt/odoo-venv/lib/python3.6/site-packages/lxml/etree.cpython-36m-x86_64-linux-gnu.so: undefined symbol: PyFPE_jbuf    

[sbidoul]

We are seeing this error in runboat containers, but not on local docker run. That is weird.

[sbidoul]

This is super weird. For some reason I don't understand, the virtualenvs created during the build initialization step are not compatible with the latest version of the oca-ci image. The timing correlates with #27, of which the root cause is unknown.

I suspect both issues are due to some change in the way the deadsnakes project packages python 3.6... not sure.

Anyway I'm launching a reset of all 3.6 builds now.