Issue #1460 has been updated by Nobuyoshi Nakada.

Status changed from Open to Assigned
Assigned to set to Usaku NAKAMURA

Don't use IO.select with pipes.  It's a known restriction.
If you really need to it, use 1.8.7.
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http://redmine.ruby-lang.org/issues/show/1460

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http://redmine.ruby-lang.org