appium: Failed to launch simulator with [MJSONWP] Encountered internal error running command: Error: Condition unmet after xxxx ms. Timing out.

The problem

Failed to launch simulator in ios sim reset flow.

Environment

• Appium version (or git revision) that exhibits the issue:
  • Appium 1.5.2
• Last Appium version that did not exhibit the issue (if applicable):
  • Appium 1.4.16
• Desktop OS/version used to run Appium:
  • Mac OS X 10.11.4
• Node.js version (unless using Appium.app|exe):
  • v4.2.4
• Mobile platform/version under test:
  • iOS SDK 9.2
  • Xcode 7.2
• Real device or emulator/simulator:
  • simulator
• Appium CLI or Appium.app|exe:
  • Appium CLI

And

• use ruby_lib 8.0.2

Details

• When I tried to start and launch test, then ios simulator never launch and repeated timeout error.
  • [MJSONWP] Encountered internal error running command: Error: Condition unmet after 60239 ms. Timing out.
• Once restart Machine(Mac OS X 10.11), then some times fixed it and could run test. But after some running tests, this issue happened again.
• According to stackoverflow here, this issue is fixed sometimes if I re-install Xcode and its commandline tools. But this issue reproduced again.
• According to the following error log, I attached as Appium log, this problem may start to reproduce after failed to set locale with 500 error.
  • https://gist.github.com/KazuCocoa/ea10e43f452043f3eabe3585775c662f#file-20160430_appium_failed_to_launch_simulator-log-L76-L20160430

Link to Appium logs

• Debug log
  • https://gist.github.com/KazuCocoa/ea10e43f452043f3eabe3585775c662f
• log of [driver_start_with] is https://github.com/KazuCocoa/scenarioForAppiumIssue5920/blob/master/lib/c_appium/driver.rb#L19, which is my log.

Code To Reproduce Issue [ Good To Have ]

• You may be able to reproduce any apps such as https://github.com/KazuCocoa/scenarioForAppiumIssue5920/
• Once reproduce this issue, I never launch ios simulator until reboot machine.