From: akr@...
Date: 2014-08-06T13:09:33+00:00
Subject: [ruby-core:64231] [ruby-trunk - Bug #10093] [Feedback]	SecureRandom.uuid is unstable

Issue #10093 has been updated by Akira Tanaka.

Status changed from Open to Feedback

I see.  "g" is not a valid character for UUID.

However I couldn't reproduce the problem.

I run following script but no problem happened in several days.

```
% ruby -v -rsecurerandom -e '
STDOUT.sync = true
while true
  uuid = SecureRandom.uuid
  if /\A[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\z/ !~ uuid
    p uuid
  end
end'
ruby 2.2.0dev (2014-06-11 trunk 46400) [x86_64-linux]
```

Can anyone reproduce the problem?

Anyway, the method uses String#% as follows.

```
"%08x-%04x-%04x-%04x-%04x%08x" % ary
```

So "g" should not be produced unless String#% has a problem.

----------------------------------------
Bug #10093: SecureRandom.uuid is unstable
https://bugs.ruby-lang.org/issues/10093#change-48223

* Author: Man Vuong
* Status: Feedback
* Priority: Normal
* Assignee: 
* Category: lib
* Target version: current: 2.2.0
* ruby -v: ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
SecureRandom.uuid sometimes generates some value like this:
e7be09bb-e939-43db-9c20-dfad9c27fd3g

And it's not a valid UUID. This problem occurred randomly for me, I don't know how to reproduce :(



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