[ruby-core:89094] [Ruby trunk Bug#15130] open-uri hangs on cygwin

Issue #15130 has been updated by duerst (Martin D端rst).


This issue doesn't exist before #15072 started at r64485 and made it impossible to check whether open-uri works or not. I'm assigning this to Eric (normalperson) because it may well be timeout-related. Sorry if that turns out not to be the case.

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Bug #15130: open-uri hangs on cygwin
https://bugs.ruby-lang.org/issues/15130#change-74114

* Author: duerst (Martin D端rst)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-09-16 trunk 64761) [x86_64-cygwin]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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After using `make; make runnable`, the following one-liner hangs:

```
 ./ruby -ropen-uri -e 'open "http://web.mit.edu/index.html"'
```

This happens on any http URI, but not for local files. The above URI is just an example. I would have chosen ruby-lang.org if it was still using http, but I didn't want to complicate this with https.

The `open` work for local files. I discovered this when trying to use `make up`, where the downloading of Unicode data files just hung.

Here's the trace I get after hitting Ctrl-C:

Traceback (most recent call last):
        15: from -e:1:in `<main>'
        14: from /cygdrive/c/Data/ruby_test_copy/lib/open-uri.rb:35:in `open'
        13: from /cygdrive/c/Data/ruby_test_copy/lib/open-uri.rb:736:in `open'
        12: from /cygdrive/c/Data/ruby_test_copy/lib/open-uri.rb:165:in `open_uri'
        11: from /cygdrive/c/Data/ruby_test_copy/lib/open-uri.rb:224:in `open_loop'
        10: from /cygdrive/c/Data/ruby_test_copy/lib/open-uri.rb:224:in `catch'
         9: from /cygdrive/c/Data/ruby_test_copy/lib/open-uri.rb:226:in `block in open_loop'
         8: from /cygdrive/c/Data/ruby_test_copy/lib/open-uri.rb:758:in `buffer_open'
         7: from /cygdrive/c/Data/ruby_test_copy/lib/open-uri.rb:337:in `open_http'
         6: from /cygdrive/c/Data/ruby_test_copy/lib/net/http.rb:924:in `start'
         5: from /cygdrive/c/Data/ruby_test_copy/lib/net/http.rb:935:in `do_start'
         4: from /cygdrive/c/Data/ruby_test_copy/lib/net/http.rb:950:in `connect'
         3: from /cygdrive/c/Data/ruby_test_copy/lib/timeout.rb:103:in `timeout'
         2: from /cygdrive/c/Data/ruby_test_copy/lib/timeout.rb:97:in `block in timeout'
         1: from /cygdrive/c/Data/ruby_test_copy/lib/timeout.rb:97:in `ensure in block in timeout'
/cygdrive/c/Data/ruby_test_copy/lib/timeout.rb:97:in `join': Interrupt

My plan is to (manually) bisect this to find the offending commit. One suspicion I have is that the problem is related to timeouts, but this is not confirmed at all. Any help is appreciated.



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