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Add monkey patch notes
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@ -42,6 +42,22 @@ Z-Wave is also getting a big update in this release. The confusing entity_ids wi
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6. Restart Home Assistant to run with new IDs.
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7. The old entity IDs will be available in the more info dialog to trace down any remaining errors.
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## {% linkable_title Monkey Patching Python 3.6 %}
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Some people have noticed that running Home Assistant under Python 3.6 can lead to segfaults. It seems to be related to the [earlier segfault issues][old-bug] that we experienced when we released the asyncio-based core. We thought that those issues would have been fixed when [Python bug 26617] was resolved. Although we see less reports compared to the old bug, there are still users [experiencing them][new-bug] ([gdb stacktrace points at `PyObject_GC_Del()`][gdb]).
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Since Python 3.6, the Task and Future classes have been moved to C. This gives a nice speed boost but also prevents us from monkey patching the Task class to avoid the segfault. [Ben Bangert] managed to brew up another monkey patch to stop Python 3.6 from using the C classes, falling back to the Python versions instead. This allows us to apply the original monkey patch again.
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Both monkey patches are now active by default starting version 0.47 to avoid our users experiencing segfaults. This comes at a cost of not being able to benefit from all optimizations that were introduced in Python 3.6.
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To run without the monkey patch, start Home Assistant with `HASS_NO_MONKEY=1 hass`. We will further investigate this issue and try to fix it in a future version of Python.
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[old-bug]: https://github.com/home-assistant/home-assistant/issues/3453
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[Python bug 26617]: https://bugs.python.org/issue26617
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[new-bug]: https://github.com/home-assistant/home-assistant/issues/7752
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[gdb]: https://github.com/home-assistant/home-assistant/issues/7752#issuecomment-305100009
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[Ben Bangert]: https://github.com/bbangert
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## {% linkable_title New platforms %}
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- Added a Taps Aff binary sensor ([@bazwilliams] - [#7880]) ([binary_sensor.tapsaff docs]) (new-platform)
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