Issue #14505 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Open to Feedback

That python code isn't equivalent, as it does not capture the output.
Does `system("ruby", "-r", "oci8", "-e", "puts 'hello'")` block too?

----------------------------------------
Bug #14505: IO.popen / Open3.popen2 / backtick subprocess remains blocked
https://bugs.ruby-lang.org/issues/14505#change-70585

* Author: lionel_perrin (Lionel PERRIN)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
The following ruby code never returns

~~~ ruby
`ruby -r oci8 -e puts 'hello'`
IO.popen(%w(ruby -r oci8 -e)+["puts 'hello'"]) { |o| puts o.read } # this never returns too
Open3.capture2(*%w(ruby -r oci8 -e)+["puts 'hello'"]) # and this is blocked too
~~~

while its python equivalent runs successfully

~~~ python
import subprocess
subprocess.call(['ruby', '-r', 'oci8', '-e', 'puts "hello"'])
~~~

The issue seems to require some 'unusual' context to be triggered. The ruby-oci8 (https://github.com/kubo/ruby-oci8) gem used by the subprocess  loads an oracle dll which seems to open some file descriptors. Anyway, I wouldn't expect the caller to be affected by the libraries loaded by the subprocesses.

I've reproduced the problem with ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux] (gemset 2.7.6)

Thanks for your help,

Lionel



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