[Bug 1711724] Re: Segfaults with dict

[Monty Taylor]

The quilt patch (and upstream bugfix) adds unit test
test_fromkeys_operator_modifying_dict_operand which demonstrate a
reproducer which has been verified to fail on xenial 3.5.2 and to work
after applying the patch.

** Attachment added: "Python script showing test_fromkeys_operator_modifying_dict_operand reproduction case"
   https://bugs.launchpad.net/ubuntu/+source/python3.5/+bug/1711724/+attachment/4934876/+files/test_fromkeys_operator_modifying_dict_operand.py

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https://bugs.launchpad.net/bugs/1711724

Title:
  Segfaults with dict

Status in python3.5 package in Ubuntu:
  Invalid
Status in python3.6 package in Ubuntu:
  Fix Released
Status in python3.5 source package in Xenial:
  New
Status in python3.6 source package in Xenial:
  Invalid
Status in python3.5 source package in Zesty:
  New
Status in python3.6 source package in Zesty:
  New

Bug description:
  In certain situations python3.5 will segfault. This bug is confirmed
  and fixed upstream in Python 3.5.4

  http://bugs.python.org/issue27945

  [Test Case]
  1. download attached bpo-27945.py
  2. run: python3.5 bpo-27945.py

  If it does not segfault, the bug is fixed.

  [Regression Potential]
  The fix has been shown to introduce a minor performance hit for dictionaries in general.

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