From: Eric Wong <normalperson@...>
Date: 2014-01-20T07:38:08+00:00
Subject: [ruby-core:59895] Re: [Backport200 - Backport #9432] [Open] ThreadError [ Attempt to unlock a mutex which is locked by another thread ]

> 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.

Have you contacted the sidekiq author about this?