ios8 - Xcode 6.4 showing duplicate 'Simulators' with Unique Id

Question

Till yesterday, everything was normal with Xcode. It was showing simulators as :

But today, when I opened it, simulator list changed to :

Every simulator can be seen twice, name followed by a unique id. I have also observed that same named Simulator are also two different instances.

Can anyone help me, how to get rid of this ? Or how to reset it. It gives a weird look.

Any suggestion will be helpful.

Answer 1

Solution from sunnyxx's weibo:

1.quit Xcode and iOS Simulator

2.killall -9 com.apple.CoreSimulator.CoreSimulatorService

3.rm -rf ~/Library/Developer/CoreSimulator/Devices

4.reopen Xcode

Edit: sudo seems unnecessary to kill SimulatorService.This solution will remove all exist simulator and recreate all available version and type simulators.