[ruby-core:66822] [Backport200 - Backport #9432] ThreadError [ Attempt to unlock a mutex which is locked by another thread ]

Issue #9432 has been updated by Eric Wong.


 Can you show us a small test case?  Which version of Sidekiq?
 
 Note: this issue seems to not affect Ruby 2.1+ because thread.rb was
 rewritten in C.  I looked briefly and #9132 but I'd rather deal
 with issues in pure Ruby or C, not C++.

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Backport #9432:  ThreadError [ Attempt to unlock a mutex which is locked by another thread ]
https://bugs.ruby-lang.org/issues/9432#change-50390

* Author: rajesh shanmugam
* Status: Open
* Priority: Normal
* Assignee: 
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I use ruby-2.0.0-p247. I seem to get this issue frequently in threaded environment. (Sidekiq) 

I am not very sure if it a ruby thread issue as such or something I am doing wrong. If there is any more details you need I would be happy to provide you.

Operating system: Ubuntu

Trace

```
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/thread.rb:188:in `synchronize'
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/thread.rb:188:in `block in pop'
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/thread.rb:187:in `handle_interrupt'
/home/ubuntu/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/thread.rb:187:in `pop'
```

Regards
Rajesh



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