STINNER Victor added the comment:

@Ned Deily: Hey, Nathaniel wants to backport the commit 
4ae01496971624c75080431806ed1c08e00f22c7 which changes how the C signal handler 
of CPython.

There is a low risk of regression, it can be seen as a backward incompatible 
change.

I'm not super excited to backport such change. I consider that there are other 
solutions to handle signals without hitting this bug. For example, asyncio 
works well on Python 3.5, there is no known race condition. Basically, the only 
impacted application is Nathaniel's Trio project.

@Yury: And you, what do you think?

----------
nosy: +ned.deily, yselivanov

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