bundle install時にNo live threads left. Deadlockエラー

## 事象
MacでRailsのbundle installで、
No live threads left. Deadlockエラーが発生する

## 環境
Mac : sierra
Ruby: 2.3.1
Rails: 4.2.8

## errorログ


```
--- ERROR REPORT TEMPLATE -------------------------------------------------------
# Error Report

## Questions

Please fill out answers to these questions, it'll help us figure out
why things are going wrong.

- **What did you do?**

  I ran the command `/Users/myuser/.rbenv/versions/2.3.1/bin/bundle install --path vendor/bundle --jobs=1`

- **What did you expect to happen?**

  I expected Bundler to...

- **What happened instead?**

  Instead, what happened was...

- **Have you tried any solutions posted on similar issues in our issue tracker, stack overflow, or google?**

  I tried...

- **Have you read our issues document, https://github.com/bundler/bundler/blob/master/doc/contributing/ISSUES.md?**

  ...

## Backtrace

fatal: No live threads left. Deadlock?
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/worker.rb:43:in `pop'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/worker.rb:43:in `deq'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/installer/parallel_installer.rb:131:in `process_specs'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/installer/parallel_installer.rb:102:in `call'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/installer/parallel_installer.rb:77:in `call'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/installer.rb:199:in `install_in_parallel'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/installer.rb:166:in `install'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/installer.rb:80:in `run'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/installer.rb:24:in `install'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli/install.rb:70:in `run'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli.rb:181:in `block in install'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/settings.rb:99:in `temporary'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli.rb:180:in `install'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/vendor/thor/lib/thor.rb:359:in `dispatch'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli.rb:20:in `dispatch'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/vendor/thor/lib/thor/base.rb:440:in `start'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/cli.rb:11:in `start'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/exe/bundle:32:in `block in <top (required)>'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/lib/bundler/friendly_errors.rb:121:in `with_friendly_errors'
  /Users/myuser/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/bundler-1.14.6/exe/bundle:24:in `<top (required)>'


  /Users/myuser/.rbenv/versions/2.3.1/bin/bundle:23:in `load'
  /Users/myuser/.rbenv/versions/2.3.1/bin/bundle:23:in `<main>'

## Environment

Bundler   1.14.6
Rubygems  2.5.1
Ruby      2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin16]
GEM_HOME  /rails_apps/vendor/bundle/ruby/2.3.0
GEM_PATH
Git       2.12.2
Platform  x86_64-darwin-16
OpenSSL   OpenSSL 1.0.2k  26 Jan 2017

## Bundler settings

path
  Set for your local app (/rails_apps/.bundle/config): "vendor/bundle"
disable_shared_gems
  Set for your local app (/rails_apps/.bundle/config): true
jobs
  Set for your local app (/rails_apps/.bundle/config): 1

--- TEMPLATE END ----------------------------------------------------------------

Unfortunately, an unexpected error occurred, and Bundler cannot continue.

First, try this link to see if there are any existing issue reports for this error:
https://github.com/bundler/bundler/search?q=No+live+threads+left.+Deadlock%3F&type=Issues

If there aren't any reports for this error yet, please create copy and paste the report template above into a new issue. Don't forget to anonymize any private data! The new issue form is located at:
https://github.com/bundler/bundler/issues/new

```

## 原因
よくわからないが、GemfileとGemfile.lockの不整合が原因（と思われる）


``$ rm Gemfile.lock``

でOK

``$bundle install --path vendor/bundle --jobs=1``

では解決しなかった