STINNER Victor added the comment:

This issue contains two sub-issues:
- race condition in_write_to_self() => already fixed
- race condition with scheduled call to future.set_result(), InvalidStateError 
=> I just opened the issue #21886 to discuss it

@Ryder: If you are able to reproduce the second issue (InvalidStateError), 
please use set the environment variable PYTHONASYNCIODEBUG=1 to see the 
traceback where the call to set_result() was scheduled. It requires the latest 
development version of Tulip, Python 3.4 or Python 3.5 to get the traceback.

I close this issue because I prefer to discuss the InvalidStateError in the 
issue #21886.

Thanks for the report Ryder. Thanks for the fix for the race condition in 
_write_to_self() Guido.

----------
resolution:  -> fixed
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21447>
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