[Bug 1620754] Re: python-cryptography ftbfs for 3.5 on armhf with a bus error

[James Page]

This should reproduce the bus error:

```
import datetime

from cryptography import x509

def test_hash():
    invalid1 = x509.InvalidityDate(datetime.datetime(2015, 1, 1, 1, 1))
    invalid2 = x509.InvalidityDate(datetime.datetime(2015, 1, 1, 1, 1))
    invalid3 = x509.InvalidityDate(datetime.datetime(2015, 1, 1, 1, 2))
    assert hash(invalid1) == hash(invalid2)
    assert hash(invalid1) != hash(invalid3)

test_hash()
```

but right now every porter I access has a broken dpkg lock preventing me
from installing python3-cryptography

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https://bugs.launchpad.net/bugs/1620754

Title:
  python-cryptography ftbfs for 3.5 on armhf with a bus error

Status in python-cryptography package in Ubuntu:
  In Progress

Bug description:
  seen with
  https://launchpad.net/ubuntu/+source/python-cryptography/1.4-2/+build/10476934
  https://launchpad.net/ubuntu/+source/python-cryptography/1.5-1/+build/10678695

  the TestInvalidityDate.test_invalid_invalidity_date test is the first
  one to fail with a bus error. No reasonable traceback from gdb.

  Trying to build python3.5, python-cffi and python-cryptography with
  -mno-unaligned-access doesn't fix the issue (buildds running on a
  64bit kernel).

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