[Bug 1711724] Re: Segfaults with dict

[Simon Déziel]

On Zesty, before with python3.6:

$ python3.6 /tmp/bpo-27945.py 
Segmentation fault

After applying 3.6.1-1ubuntu0~17.04.0:

$ python3.6 /tmp/bpo-27945.py 
Traceback (most recent call last):
  File "/tmp/bpo-27945.py", line 7, in <module>
    for result in d.items():
RuntimeError: dictionary changed size during iteration
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
    import apport.fileutils
  File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
    from apport.packaging_impl import impl as packaging
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
    import apt
  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'

Original exception was:
Traceback (most recent call last):
  File "/tmp/bpo-27945.py", line 7, in <module>
    for result in d.items():
RuntimeError: dictionary changed size during iteration

The except hook error is unrelated.

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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:
  Fix Committed
Status in python3.6 source package in Xenial:
  Invalid
Status in python3.5 source package in Zesty:
  In Progress
Status in python3.6 source package in Zesty:
  Fix Committed

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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