On 06/28/2016 02:05 PM, Yury Selivanov wrote:

Long story short, I've discovered that asyncio is broken in 3.5.2.
Specifically, there is a callbacks race in `loop.sock_connect` which
can make subsequent `loop.sock_sendall` calls to hang forever.  This
thing is very tricky and hard to detect and debug; I had to spend a
few hours investigating what's going on with a failing unittest in
uvloop (asyncio-compatible event loop).  I can only imagine how hard
it would be to understand what's going on in a larger codebase.

For those who is interested, here's a PR for asyncio repo:
https://github.com/python/asyncio/pull/366  It explains the bug in
detail and there has a proposed patch to fix the problem.

Larry and the release team: would it be possible to make an
"emergency" 3.5.3 release?

I've looped in the rest of the 3.5 release team.

By the way, I don't know why you Cc'd Nick and Brett. While they're fine fellows, they aren't on the release team, and they aren't involved in these sorts of decisions.

/arry