STINNER Victor added the comment:

> The system is rather slow (a shared VPS instance). In the trace you can 
> SIGALRM is triggered before the first write() call (or so it seems).

Yep. It remembers me my old idea to make "sleep configurable" in tests: issue 
#20910.

Most of the time, 1 second is enough. But on such very slow setup, it's 
annoying to get random failures because of race conditions. It would be better 
to use longer timeout (ex: 5 seconds), without making tests longer on other 
buildbots.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue23680>
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