Issue #12445 has been updated by Martin Drst.


Very much the same also for `TestReadPartial#test_open_pipe`. Probably also related.

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Bug #12445: Testing TestIO#test_open_fifo_does_not_block_other_threads results in deadlock on cygwin
https://bugs.ruby-lang.org/issues/12445#change-58973

* Author: Martin Drst
* Status: Open
* Priority: Normal
* Assignee: Nobuyoshi Nakada
* ruby -v: ruby 2.4.0dev (2016-05-31 trunk 55228) [x86_64-cygwin]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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When I run `bin/ruby test/runner.rb test/ruby/test_*`, testing stops at `TestIO#test_open_fifo_does_not_block_other_threads`. Checking the task manager shows that this is a deadlock (there are two ruby interpreters running, but they don't use any CPU at all).

This is what I see for ages:

```
[1589/4545] TestIO#test_open_fifo_does_not_block_other_threads
```



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